update web workflow and preview behavior

This reverts commit f568faf6ed.

WebSite/package.json

@@ -4,7 +4,7 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
-    "dev": "vite --port=3000 --host=0.0.0.0",
+    "dev": "vite --port=3005 --host=0.0.0.0",
     "backend": "python ../web_backend.py",
     "build": "vite build",
     "preview": "vite preview",

WebSite/vite.config.ts

@@ -16,6 +16,9 @@ export default defineConfig(({mode}) => {
       },
     },
     server: {
+      host: '0.0.0.0',
+      port: 3005,
+      strictPort: true,
       // HMR is disabled in AI Studio via DISABLE_HMR env var.
       // Do not modify—file watching is disabled to prevent flickering during agent edits.
       hmr: process.env.DISABLE_HMR !== 'true',

generate_head_extension_video.py

@@ -5,6 +5,7 @@ from pathlib import Path
 import imageio.v2 as imageio
 import numpy as np
 from PIL import Image, ImageDraw, ImageFont
+from scipy.ndimage import gaussian_filter
 from scipy.ndimage import map_coordinates
 
 from head_extension_app import (
@@ -20,9 +21,41 @@ OUTPUT_DIR = Path("ppt_video")
 FPS = 30
 DURATION_SECONDS = 6
 END_HOLD_SECONDS = 1
+VIDEO_MODES = {"hard_boundary", "gaussian_smooth", "soft_transition"}
+MODE_LABELS = {
+    "hard_boundary": "Hard boundary",
+    "gaussian_smooth": "Gaussian smooth",
+    "soft_transition": "Soft transition",
+}
 
 
-def video_soft_bend_2d(image, angle_degrees):
+def normalize_mode(mode):
+    return mode if mode in VIDEO_MODES else "soft_transition"
+
+
+def video_motion_weight(height, width, mode):
+    mode = normalize_mode(mode)
+    yy, xx = np.mgrid[0:height, 0:width]
+    full_motion_y = height * 0.50
+    fixed_y = height * 0.92
+    boundary_y = (full_motion_y + fixed_y) * 0.5
+
+    if mode == "hard_boundary":
+        return (yy <= boundary_y).astype(np.float32)
+
+    if mode == "gaussian_smooth":
+        hard = (yy <= boundary_y).astype(np.float32)
+        return np.clip(gaussian_filter(hard, sigma=height * 0.025), 0, 1).astype(np.float32)
+
+    t = np.clip((yy - full_motion_y) / (fixed_y - full_motion_y), 0, 1)
+    weight = 1 - (t * t * (3 - 2 * t))
+
+    x_soft = np.clip((xx - width * 0.15) / (width * 0.75), 0, 1)
+    x_soft = x_soft * x_soft * (3 - 2 * x_soft)
+    return np.clip(weight * (0.90 + 0.10 * x_soft), 0, 1).astype(np.float32)
+
+
+def video_soft_bend_2d(image, angle_degrees, mode="soft_transition"):
     """Video-only 2D deformation with a broad neck transition.
 
     The app's fast preview uses a compact transition, which is useful for
@@ -37,19 +70,7 @@ def video_soft_bend_2d(image, angle_degrees):
     pivot_x = int(width * 0.55)
     pivot_y = int(height * 0.62)
 
-    # Broad transition: nearly full motion for head/upper C-spine, then a long
-    # smooth blend through the lower C-spine to avoid splitting bone structures.
-    full_motion_y = height * 0.50
-    fixed_y = height * 0.92
-    t = np.clip((yy - full_motion_y) / (fixed_y - full_motion_y), 0, 1)
-    weight = 1 - (t * t * (3 - 2 * t))
-
-    # A small x-dependent term keeps the posterior contour from looking like a
-    # straight sliced plane while remaining deterministic and smooth.
-    x_soft = np.clip((xx - width * 0.15) / (width * 0.75), 0, 1)
-    x_soft = x_soft * x_soft * (3 - 2 * x_soft)
-    weight = np.clip(weight * (0.90 + 0.10 * x_soft), 0, 1)
-
+    weight = video_motion_weight(height, width, mode)
     theta = np.deg2rad(angle_degrees) * weight
     cos_t = np.cos(theta)
     sin_t = np.sin(theta)
@@ -74,8 +95,9 @@ def smoothstep(t):
     return t * t * (3 - 2 * t)
 
 
-def make_frame(before_image, angle, max_angle):
-    after_image = video_soft_bend_2d(before_image, angle)
+def make_frame(before_image, angle, max_angle, show_arrow=True, mode="soft_transition"):
+    mode = normalize_mode(mode)
+    after_image = video_soft_bend_2d(before_image, angle, mode)
 
     frame = Image.new("RGB", (1920, 1080), (0, 0, 0))
     draw = ImageDraw.Draw(frame)
@@ -90,32 +112,16 @@ def make_frame(before_image, angle, max_angle):
     draw.text((135, 120), "Original: 0 deg", font=title_font, fill=(255, 255, 255))
     draw.text(
         (1055, 120),
-        f"Head extension: {angle:04.1f} deg",
+        f"{MODE_LABELS[mode]}: {angle:04.1f} deg",
         font=title_font,
         fill=(255, 255, 255),
     )
 
-    # Yellow direction arrow on the animated side.
     arrow = (255, 210, 60)
-    x0, y0, x1, y1 = 1390, 405, 1515, 335
-    draw.line((x0, y0, x1, y1), fill=arrow, width=8)
-    draw.polygon([(x1, y1), (x1 - 34, y1 + 3), (x1 - 12, y1 + 29)], fill=arrow)
-
-    # Minimal progress bar.
-    bar_x, bar_y, bar_w, bar_h = 1040, 980, 760, 12
-    draw.rounded_rectangle(
-        (bar_x, bar_y, bar_x + bar_w, bar_y + bar_h),
-        radius=6,
-        fill=(70, 70, 70),
-    )
-    fill_w = int(bar_w * angle / max_angle) if max_angle else 0
-    draw.rounded_rectangle(
-        (bar_x, bar_y, bar_x + fill_w, bar_y + bar_h),
-        radius=6,
-        fill=arrow,
-    )
-    draw.text((1040, 1000), "0 deg", font=get_font(24), fill=(210, 210, 210))
-    draw.text((1745, 1000), f"{max_angle:g} deg", font=get_font(24), fill=(210, 210, 210))
+    if show_arrow:
+        x0, y0, x1, y1 = 1390, 405, 1515, 335
+        draw.line((x0, y0, x1, y1), fill=arrow, width=8)
+        draw.polygon([(x1, y1), (x1 - 34, y1 + 3), (x1 - 12, y1 + 29)], fill=arrow)
 
     # Invisible-looking spacer: keeps the font imported above alive for some PIL builds.
     _ = angle_font
@@ -148,10 +154,22 @@ def parse_args():
         default=DURATION_SECONDS,
         help="Animation duration in seconds before final hold. Default: 6",
     )
+    parser.add_argument(
+        "--no-arrow",
+        action="store_true",
+        help="Hide the yellow direction arrow.",
+    )
+    parser.add_argument(
+        "--mode",
+        default="soft_transition",
+        choices=["hard_boundary", "gaussian_smooth", "soft_transition"],
+        help="2D video deformation mode. Default: soft_transition",
+    )
     return parser.parse_args()
 
 
-def generate_video(input_dir, output_path, max_angle=20.0, duration_seconds=6.0):
+def generate_video(input_dir, output_path, max_angle=20.0, duration_seconds=6.0, show_arrow=True, mode="soft_transition"):
+    mode = normalize_mode(mode)
     output_file = Path(output_path)
     output_file.parent.mkdir(parents=True, exist_ok=True)
 
@@ -172,17 +190,17 @@ def generate_video(input_dir, output_path, max_angle=20.0, duration_seconds=6.0)
         for index in range(moving_frames):
             t = index / (moving_frames - 1)
             angle = max_angle * smoothstep(t)
-            writer.append_data(np.asarray(make_frame(before_image, angle, max_angle)))
+            writer.append_data(np.asarray(make_frame(before_image, angle, max_angle, show_arrow, mode)))
 
         for _ in range(hold_frames):
-            writer.append_data(np.asarray(make_frame(before_image, max_angle, max_angle)))
+            writer.append_data(np.asarray(make_frame(before_image, max_angle, max_angle, show_arrow, mode)))
 
     return output_file.resolve()
 
 
 def main():
     args = parse_args()
-    output_file = generate_video(args.input, args.output, args.max_angle, args.duration)
+    output_file = generate_video(args.input, args.output, args.max_angle, args.duration, not args.no_arrow, args.mode)
     print(output_file)
 
 

head_extension_app.py

@@ -119,6 +119,28 @@ def crop_head_neck(image):
     return image.crop((left, top, right, bottom))
 
 
+def cutoff_center_z(coordinates_cutoff):
+    return float(np.mean([point[0] for point in coordinates_cutoff]))
+
+
+def draw_cutoff_line(panel, image_depth, coordinates_cutoff=DEFAULT_COORDINATES_CUTOFF):
+    panel = panel.copy()
+    crop_height = int(image_depth * 0.72)
+    if crop_height <= 0:
+        return panel
+
+    line_y = int(round((image_depth - 1 - cutoff_center_z(coordinates_cutoff)) * panel.height / crop_height))
+    if line_y < 0 or line_y >= panel.height:
+        return panel
+
+    draw = ImageDraw.Draw(panel)
+    shadow = (0, 0, 0)
+    line_color = (255, 215, 60)
+    draw.line((0, line_y, panel.width, line_y), fill=shadow, width=6)
+    draw.line((0, line_y, panel.width, line_y), fill=line_color, width=3)
+    return panel
+
+
 def fit_image(image, width, height):
     scale = min(width / image.width, height / image.height)
     resized = image.resize(
@@ -130,29 +152,51 @@ def fit_image(image, width, height):
     return canvas
 
 
-def preview_deform_2d(image, angle_degrees):
+def preview_motion_weight(height, width, mode="soft_transition", transition_width=90, gaussian_sigma=3):
+    yy, xx = np.mgrid[0:height, 0:width]
+    boundary_y = height * 0.71
+    transition_span = height * np.clip(float(transition_width) / 90 * 0.42, 0.18, 0.56)
+    full_motion_y = boundary_y - transition_span * 0.5
+    fixed_y = boundary_y + transition_span * 0.5
+
+    if mode == "hard_boundary":
+        return (yy <= boundary_y).astype(np.float32)
+
+    if mode == "gaussian_smooth":
+        try:
+            from scipy.ndimage import gaussian_filter
+        except Exception:
+            gaussian_filter = None
+
+        hard = (yy <= boundary_y).astype(np.float32)
+        if gaussian_filter is None:
+            return hard
+        sigma = float(np.clip(float(gaussian_sigma), 1, 12))
+        return np.clip(gaussian_filter(hard, sigma=sigma), 0, 1).astype(np.float32)
+
+    t = np.clip((yy - full_motion_y) / (fixed_y - full_motion_y), 0, 1)
+    weight = 1 - (t * t * (3 - 2 * t))
+
+    x_soft = np.clip((xx - width * 0.15) / (width * 0.75), 0, 1)
+    x_soft = x_soft * x_soft * (3 - 2 * x_soft)
+    return np.clip(weight * (0.90 + 0.10 * x_soft), 0, 1).astype(np.float32)
+
+
+def preview_deform_2d(image, angle_degrees, mode="soft_transition", transition_width=90, gaussian_sigma=3):
     """Fast visual preview only. The DICOM output uses the real 3D field."""
     try:
         from scipy.ndimage import map_coordinates
     except Exception:
         return image
 
-    arr = np.asarray(image.convert("L")).astype(np.float32)
-    h, w = arr.shape
+    arr = np.asarray(image.convert("RGB")).astype(np.float32)
+    h, w, _ = arr.shape
     yy, xx = np.mgrid[0:h, 0:w]
 
     pivot_x = int(w * 0.55)
     pivot_y = int(h * 0.62)
 
-    full_motion_y = h * 0.50
-    fixed_y = h * 0.92
-    t = np.clip((yy - full_motion_y) / (fixed_y - full_motion_y), 0, 1)
-    weight = 1 - (t * t * (3 - 2 * t))
-
-    x_soft = np.clip((xx - w * 0.15) / (w * 0.75), 0, 1)
-    x_soft = x_soft * x_soft * (3 - 2 * x_soft)
-    weight = np.clip(weight * (0.90 + 0.10 * x_soft), 0, 1)
-
+    weight = preview_motion_weight(h, w, mode, transition_width, gaussian_sigma)
     theta = np.deg2rad(angle_degrees) * weight
     cos_t = np.cos(theta)
     sin_t = np.sin(theta)
@@ -161,7 +205,11 @@ def preview_deform_2d(image, angle_degrees):
     src_x = pivot_x + cos_t * dx + sin_t * dy
     src_y = pivot_y - sin_t * dx + cos_t * dy
 
-    warped = map_coordinates(arr, [src_y, src_x], order=1, mode="constant", cval=0)
+    warped_channels = [
+        map_coordinates(arr[..., channel], [src_y, src_x], order=1, mode="constant", cval=0)
+        for channel in range(arr.shape[2])
+    ]
+    warped = np.stack(warped_channels, axis=2)
     return Image.fromarray(np.clip(warped, 0, 255).astype(np.uint8)).convert("RGB")
 
 
@@ -333,7 +381,7 @@ def run_deformation(input_dir, output_dir, angle_degrees, transition_width, prog
     output_paths["legacy_soft"] = legacy_soft_dir
 
     progress("正在生成四状态过程对比图...")
-    preview_paths = make_four_state_preview(state_images, Path(output_dir), angle_degrees)
+    preview_paths = make_four_state_preview(state_images, Path(output_dir), angle_degrees, transition_width=transition_width)
     make_output_preview_from_images(
         state_images["original"],
         state_images["soft_transition"],
@@ -375,14 +423,17 @@ def make_output_preview(original_dir, deformed_dicom_dir, output_dir, angle_degr
     return preview_path
 
 
-def sitk_sagittal_panel(image):
+def sitk_sagittal_panel(image, coordinates_cutoff=None):
     volume = sitk.GetArrayFromImage(image)[::-1]
-    return crop_head_neck(sagittal_mip(volume))
+    panel = crop_head_neck(sagittal_mip(volume))
+    if coordinates_cutoff is not None:
+        panel = draw_cutoff_line(panel, volume.shape[0], coordinates_cutoff)
+    return panel
 
 
-def make_output_preview_from_images(original_image, deformed_image, output_dir, angle_degrees):
-    before = sitk_sagittal_panel(original_image)
-    after = sitk_sagittal_panel(deformed_image)
+def make_output_preview_from_images(original_image, deformed_image, output_dir, angle_degrees, coordinates_cutoff=None):
+    before = sitk_sagittal_panel(original_image, coordinates_cutoff)
+    after = sitk_sagittal_panel(deformed_image, coordinates_cutoff)
 
     slide = Image.new("RGB", (2560, 1440), (0, 0, 0))
     draw = ImageDraw.Draw(slide)
@@ -408,14 +459,32 @@ def make_output_preview_from_images(original_image, deformed_image, output_dir,
     return preview_path
 
 
-def make_four_state_preview(state_images, output_dir, angle_degrees):
+def make_four_state_preview(state_images, output_dir, angle_degrees, coordinates_cutoff=None, transition_width=90):
     output_dir = Path(output_dir)
     screenshot_dir = output_dir / "process_screenshots"
     reset_folder(screenshot_dir)
 
+    original_panel = sitk_sagittal_panel(state_images["original"], coordinates_cutoff)
+    preview_panels = {
+        "original": original_panel,
+        "hard_boundary": preview_deform_2d(original_panel, angle_degrees, "hard_boundary"),
+        "gaussian_smooth": preview_deform_2d(
+            original_panel,
+            angle_degrees,
+            "gaussian_smooth",
+            transition_width,
+        ),
+        "soft_transition": preview_deform_2d(
+            original_panel,
+            angle_degrees,
+            "soft_transition",
+            transition_width,
+        ),
+    }
+
     panels = []
     for state_key, label, _ in STATE_LABELS:
-        panel = sitk_sagittal_panel(state_images[state_key])
+        panel = preview_panels[state_key]
         panel_path = screenshot_dir / f"{state_key}.png"
         panel.save(panel_path, quality=95)
         panels.append((label, panel))
@@ -488,7 +557,7 @@ class HeadExtensionApp:
         self.angle = Scale(
             controls,
             from_=0,
-            to=20,
+            to=45,
             orient=HORIZONTAL,
             resolution=0.5,
             length=420,
@@ -573,11 +642,17 @@ class HeadExtensionApp:
                 self.status.set("正在读取 DICOM 生成预览...")
                 self.cached_volume = load_dicom_volume(self.input_dir.get())
             before = crop_head_neck(sagittal_mip(self.cached_volume))
-            after = preview_deform_2d(before, float(self.angle.get()))
+            before_with_line = draw_cutoff_line(before, self.cached_volume.shape[0])
+            after = preview_deform_2d(
+                before_with_line,
+                float(self.angle.get()),
+                transition_width=float(self.transition.get()),
+                gaussian_sigma=3,
+            )
 
             canvas = Image.new("RGB", (1120, 610), (0, 0, 0))
             draw = ImageDraw.Draw(canvas)
-            before_panel = fit_image(before, 520, 500)
+            before_panel = fit_image(before_with_line, 520, 500)
             after_panel = fit_image(after, 520, 500)
             canvas.paste(before_panel, (30, 80))
             canvas.paste(after_panel, (570, 80))

video_generator_app.py

@@ -51,7 +51,7 @@ class VideoGeneratorApp:
         self.max_angle = Scale(
             controls,
             from_=5,
-            to=30,
+            to=45,
             orient=HORIZONTAL,
             resolution=1,
             length=360,

web_backend.py

@@ -12,14 +12,20 @@ from email.policy import default
 from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
 from io import BytesIO
 from pathlib import Path
-from urllib.parse import parse_qs, unquote, urlparse
+from urllib.parse import parse_qs, quote, unquote, urlparse
 
 os.environ.setdefault("MPLCONFIGDIR", "/tmp/head_ct_morph_matplotlib")
 
+import pydicom
+from pydicom.multival import MultiValue
+from PIL import Image
+
 from generate_head_extension_video import generate_video
 from head_extension_app import (
     APP_DIR,
     crop_head_neck,
+    ct_window,
+    draw_cutoff_line,
     fit_image,
     load_dicom_volume,
     preview_deform_2d,
@@ -33,9 +39,13 @@ HOST = "0.0.0.0"
 PORT = 8787
 JOBS = {}
 JOBS_LOCK = threading.Lock()
+DICOM_FILE_CACHE = {}
 LIBRARY_DIR = APP_DIR / "web_library"
 LIBRARY_META = LIBRARY_DIR / "library.json"
 RESULT_DIR = APP_DIR / "web_results"
+JOBS_META = RESULT_DIR / "jobs.json"
+USER_TASKS_META = RESULT_DIR / "user_tasks.json"
+PREVIEW_CACHE_DIR = LIBRARY_DIR / "_preview_cache"
 
 
 def json_default(value):
@@ -52,6 +62,27 @@ def safe_filename(name):
     return "".join(char if char.isalnum() or char in "._-" else "_" for char in Path(name).name)
 
 
+def normalized_username(username):
+    username = str(username or "").strip()
+    return username or "anonymous"
+
+
+def read_json_file(path, default):
+    path = Path(path)
+    if not path.exists():
+        return default
+    try:
+        return json.loads(path.read_text(encoding="utf-8"))
+    except Exception:
+        return default
+
+
+def write_json_file(path, value):
+    path = Path(path)
+    safe_mkdir(path.parent)
+    path.write_text(json.dumps(value, ensure_ascii=False, indent=2, default=json_default), encoding="utf-8")
+
+
 def read_library_meta():
     safe_mkdir(LIBRARY_DIR)
     if LIBRARY_META.exists():
@@ -109,6 +140,175 @@ def list_library():
     return live_items
 
 
+def sort_key_for_dicom(path):
+    path = Path(path)
+    try:
+        ds = pydicom.dcmread(str(path), stop_before_pixels=True, force=True)
+        return (0, int(getattr(ds, "InstanceNumber", 0)), path.name)
+    except Exception:
+        stem = path.stem
+        return (1, int(stem) if stem.isdigit() else 0, path.name)
+
+
+def sorted_dicom_files(dicom_dir):
+    dicom_dir = Path(dicom_dir).resolve()
+    files = list(dicom_dir.glob("*.dcm"))
+    signature = (
+        str(dicom_dir),
+        len(files),
+        max((file_path.stat().st_mtime for file_path in files), default=0),
+    )
+    cached = DICOM_FILE_CACHE.get(str(dicom_dir))
+    if cached and cached["signature"] == signature:
+        return cached["files"]
+
+    sorted_files = sorted(files, key=sort_key_for_dicom)
+    DICOM_FILE_CACHE[str(dicom_dir)] = {
+        "signature": signature,
+        "files": sorted_files,
+    }
+    return sorted_files
+
+
+def find_library_item(item_id):
+    return next((item for item in list_library() if item["id"] == item_id), None)
+
+
+def make_library_slice_preview(item_id, index):
+    item = find_library_item(item_id)
+    if not item:
+        raise RuntimeError("影像库中没有找到该数据。")
+
+    dicom_files = sorted_dicom_files(item["dicomPath"])
+    if not dicom_files:
+        raise RuntimeError("该影像数据没有可预览的 .dcm 文件。")
+
+    count = len(dicom_files)
+    index = max(0, min(int(index), count - 1))
+    cache_dir = PREVIEW_CACHE_DIR / item_id
+    safe_mkdir(cache_dir)
+    preview_path = cache_dir / f"slice_{index:04d}.png"
+    if not preview_path.exists():
+        ds = pydicom.dcmread(str(dicom_files[index]), force=True)
+        image = ds.pixel_array.astype("float32")
+        image = image * float(getattr(ds, "RescaleSlope", 1))
+        image = image + float(getattr(ds, "RescaleIntercept", 0))
+
+        preview = Image.fromarray(ct_window(image)).convert("RGB")
+        preview = fit_image(preview, 720, 520)
+        preview.save(preview_path, format="PNG")
+
+    neighbors = [value for value in [index - 1, index + 1] if 0 <= value < count]
+    return {
+        "imageUrl": f"/api/file?path={quote(str(preview_path.resolve()), safe='')}",
+        "index": index,
+        "count": count,
+        "file": dicom_files[index].name,
+        "patientId": item["patientId"],
+        "neighbors": [
+            f"/api/library/preview?id={item_id}&index={neighbor}"
+            for neighbor in neighbors
+        ],
+    }
+
+
+def dicom_value(ds, name, fallback="-"):
+    value = getattr(ds, name, fallback)
+    if value in [None, ""]:
+        return fallback
+    if isinstance(value, (list, tuple, MultiValue)):
+        return " / ".join(str(item) for item in value)
+    return str(value)
+
+
+def dicom_date(value):
+    value = str(value or "")
+    if len(value) == 8 and value.isdigit():
+        return f"{value[0:4]}-{value[4:6]}-{value[6:8]}"
+    return value or "-"
+
+
+def dicom_time(value):
+    value = str(value or "")
+    if len(value) >= 6 and value[:6].isdigit():
+        return f"{value[0:2]}:{value[2:4]}:{value[4:6]}"
+    return value or "-"
+
+
+def make_library_info(item_id):
+    item = find_library_item(item_id)
+    if not item:
+        raise RuntimeError("影像库中没有找到该数据。")
+
+    dicom_files = sorted_dicom_files(item["dicomPath"])
+    if not dicom_files:
+        raise RuntimeError("该影像数据没有可读取的 .dcm 文件。")
+
+    first = pydicom.dcmread(str(dicom_files[0]), stop_before_pixels=True, force=True)
+    last = pydicom.dcmread(str(dicom_files[-1]), stop_before_pixels=True, force=True)
+    pixel_spacing = dicom_value(first, "PixelSpacing")
+    matrix = f"{dicom_value(first, 'Columns')} x {dicom_value(first, 'Rows')}"
+    instance_range = f"{dicom_value(first, 'InstanceNumber')} - {dicom_value(last, 'InstanceNumber')}"
+
+    return {
+        "id": item["id"],
+        "patientId": item["patientId"],
+        "fileCount": len(dicom_files),
+        "groups": [
+            {
+                "title": "患者信息",
+                "items": [
+                    {"label": "患者姓名", "value": dicom_value(first, "PatientName")},
+                    {"label": "患者 ID", "value": dicom_value(first, "PatientID")},
+                    {"label": "性别", "value": dicom_value(first, "PatientSex")},
+                    {"label": "年龄", "value": dicom_value(first, "PatientAge")},
+                ],
+            },
+            {
+                "title": "检查信息",
+                "items": [
+                    {"label": "检查日期", "value": dicom_date(getattr(first, "StudyDate", ""))},
+                    {"label": "检查时间", "value": dicom_time(getattr(first, "StudyTime", ""))},
+                    {"label": "检查描述", "value": dicom_value(first, "StudyDescription")},
+                    {"label": "检查号", "value": dicom_value(first, "AccessionNumber")},
+                    {"label": "机构", "value": dicom_value(first, "InstitutionName")},
+                ],
+            },
+            {
+                "title": "序列信息",
+                "items": [
+                    {"label": "模态", "value": dicom_value(first, "Modality")},
+                    {"label": "部位", "value": dicom_value(first, "BodyPartExamined")},
+                    {"label": "序列描述", "value": dicom_value(first, "SeriesDescription")},
+                    {"label": "序列号", "value": dicom_value(first, "SeriesNumber")},
+                    {"label": "制造商", "value": dicom_value(first, "Manufacturer")},
+                ],
+            },
+            {
+                "title": "图像参数",
+                "items": [
+                    {"label": "切片数", "value": str(len(dicom_files))},
+                    {"label": "Instance 范围", "value": instance_range},
+                    {"label": "矩阵", "value": matrix},
+                    {"label": "像素间距", "value": pixel_spacing},
+                    {"label": "层厚", "value": dicom_value(first, "SliceThickness")},
+                    {"label": "层间距", "value": dicom_value(first, "SpacingBetweenSlices")},
+                    {"label": "卷积核", "value": dicom_value(first, "ConvolutionKernel")},
+                ],
+            },
+            {
+                "title": "扫描参数",
+                "items": [
+                    {"label": "KVP", "value": dicom_value(first, "KVP")},
+                    {"label": "管电流", "value": dicom_value(first, "XRayTubeCurrent")},
+                    {"label": "曝光时间", "value": dicom_value(first, "ExposureTime")},
+                    {"label": "重建直径", "value": dicom_value(first, "ReconstructionDiameter")},
+                ],
+            },
+        ],
+    }
+
+
 def parse_multipart(headers, body):
     content_type = headers.get("content-type", "")
     message = BytesParser(policy=default).parsebytes(
@@ -160,6 +360,91 @@ def add_dicom_from_zip(target_dir, zip_filename, payload, start_index):
     return count
 
 
+def validate_single_dicom_series(dicom_dir):
+    series_counts = {}
+    for dicom_path in Path(dicom_dir).glob("*.dcm"):
+        try:
+            ds = pydicom.dcmread(str(dicom_path), stop_before_pixels=True, force=True)
+        except Exception as exc:
+            raise RuntimeError(f"{dicom_path.name} 不是可读取的 DICOM 文件。") from exc
+        series_uid = str(getattr(ds, "SeriesInstanceUID", "") or "NO_SERIES_UID")
+        series_counts[series_uid] = series_counts.get(series_uid, 0) + 1
+
+    if len(series_counts) > 1:
+        series_summary = ", ".join(str(count) for count in sorted(series_counts.values(), reverse=True))
+        raise RuntimeError(
+            "上传内容包含多个 DICOM 序列，不能作为一个影像库数据集导入。"
+            f"检测到 {len(series_counts)} 个序列，分别约 {series_summary} 张。"
+            "请上传单个序列文件夹/ZIP。"
+        )
+
+
+def reset_demo_environment():
+    source_dir = APP_DIR / "Ori_Head_CT"
+    source_zip = APP_DIR / "Ori_Head_CT.zip"
+    demo_root = LIBRARY_DIR / "demo_ori_head_ct"
+    demo_dicom_dir = demo_root / "dicom"
+
+    if not source_dir.exists() and not source_zip.exists():
+        raise RuntimeError("未找到 Ori_Head_CT 或 Ori_Head_CT.zip，无法恢复演示环境。")
+
+    safe_mkdir(LIBRARY_DIR)
+    for child in LIBRARY_DIR.iterdir():
+        if child.is_dir():
+            shutil.rmtree(child)
+        else:
+            child.unlink()
+
+    safe_mkdir(demo_dicom_dir)
+    copied = 0
+    if source_dir.exists():
+        for dicom_path in sorted(source_dir.glob("*.dcm")):
+            shutil.copy2(dicom_path, demo_dicom_dir / dicom_path.name)
+            copied += 1
+    else:
+        with zipfile.ZipFile(source_zip) as archive:
+            for member in archive.infolist():
+                if member.is_dir():
+                    continue
+                member_name = member.filename.replace("\\", "/")
+                if Path(member_name).suffix.lower() != ".dcm":
+                    continue
+                if Path(member_name).is_absolute() or ".." in Path(member_name).parts:
+                    continue
+                copied += 1
+                with archive.open(member) as member_file:
+                    write_dicom_payload(demo_dicom_dir, Path(member_name).name, member_file.read(), copied)
+
+    if copied == 0:
+        shutil.rmtree(demo_root)
+        raise RuntimeError("Ori_Head_CT 中没有找到 .dcm 文件。")
+
+    validate_single_dicom_series(demo_dicom_dir)
+    record = build_library_record(
+        "demo_ori_head_ct",
+        "Ori_Head_CT",
+        demo_dicom_dir,
+        source="upload",
+        version="DICOM-DEMO",
+    )
+    write_library_meta([record])
+    DICOM_FILE_CACHE.clear()
+
+    if RESULT_DIR.exists():
+        shutil.rmtree(RESULT_DIR)
+    safe_mkdir(RESULT_DIR)
+    with JOBS_LOCK:
+        JOBS.clear()
+        persist_jobs_locked()
+    write_json_file(USER_TASKS_META, {})
+
+    return {
+        "ok": True,
+        "message": "演示环境已恢复出厂设置。",
+        "items": list_library(),
+    }
+
+
 def upload_library_item(headers, body):
     fields, files = parse_multipart(headers, body)
     dicom_files = [
@@ -198,6 +483,11 @@ def upload_library_item(headers, body):
     if total_dicom_count == 0:
         shutil.rmtree(target_dir.parent)
         raise RuntimeError("压缩包里没有找到 .dcm 文件。")
+    try:
+        validate_single_dicom_series(target_dir)
+    except Exception:
+        shutil.rmtree(target_dir.parent)
+        raise
 
     record = build_library_record(
         item_id,
@@ -231,11 +521,76 @@ def zip_folder(source_dir, zip_path):
     return zip_path
 
 
+def read_user_tasks():
+    tasks = read_json_file(USER_TASKS_META, {})
+    return tasks if isinstance(tasks, dict) else {}
+
+
+def write_user_tasks(tasks):
+    write_json_file(USER_TASKS_META, tasks)
+
+
+def set_user_task(username, kind, job_id):
+    username = normalized_username(username)
+    tasks = read_user_tasks()
+    tasks.setdefault(username, {})[kind] = job_id
+    write_user_tasks(tasks)
+
+
+def get_user_task_job(username, kind):
+    username = normalized_username(username)
+    tasks = read_user_tasks()
+    job_id = tasks.get(username, {}).get(kind)
+    if not job_id:
+        return None
+    return get_job(job_id)
+
+
+def persist_jobs_locked():
+    write_json_file(JOBS_META, JOBS)
+
+
+def load_persisted_jobs():
+    saved_jobs = read_json_file(JOBS_META, {})
+    if not isinstance(saved_jobs, dict):
+        return
+    now_text = time.strftime("%Y-%m-%d %H:%M:%S")
+    with JOBS_LOCK:
+        for job_id, job in saved_jobs.items():
+            if not isinstance(job, dict):
+                continue
+            if job.get("status") == "running":
+                job = {
+                    **job,
+                    "status": "failed",
+                    "message": "后端已重启，运行中的任务已中断。",
+                    "error": "后端服务重启后无法继续运行中的任务，请重新提交。",
+                    "updatedAt": now_text,
+                }
+            JOBS[job_id] = job
+        persist_jobs_locked()
+
+
+def deformation_progress_for_message(message):
+    if "已复制" in message:
+        return 20
+    if "正在生成四种状态" in message:
+        return 35
+    if "正在应用形变" in message:
+        return 55
+    if "正在写出四种状态" in message:
+        return 72
+    if "正在生成四状态过程对比图" in message:
+        return 82
+    return None
+
+
 def set_job(job_id, **updates):
     with JOBS_LOCK:
         job = JOBS[job_id]
         job.update(updates)
         job["updatedAt"] = time.strftime("%Y-%m-%d %H:%M:%S")
+        persist_jobs_locked()
 
 
 def get_job(job_id):
@@ -244,24 +599,31 @@ def get_job(job_id):
         return dict(job) if job else None
 
 
-def start_job(kind, worker):
+def start_job(kind, worker, owner=None, params=None, remember_user_task=True):
     job_id = uuid.uuid4().hex[:12]
+    owner = normalized_username(owner)
     with JOBS_LOCK:
         JOBS[job_id] = {
             "id": job_id,
             "kind": kind,
+            "owner": owner,
             "status": "running",
             "message": "任务已启动。",
+            "progress": 1,
+            "params": params or {},
             "result": None,
             "error": None,
             "createdAt": time.strftime("%Y-%m-%d %H:%M:%S"),
             "updatedAt": time.strftime("%Y-%m-%d %H:%M:%S"),
         }
+        persist_jobs_locked()
+    if remember_user_task:
+        set_user_task(owner, kind, job_id)
 
     def run():
         try:
             result = worker(job_id)
-            set_job(job_id, status="completed", message="任务完成。", result=result)
+            set_job(job_id, status="completed", message="任务完成。", progress=100, result=result)
         except Exception as exc:
             set_job(
                 job_id,
@@ -275,14 +637,33 @@ def start_job(kind, worker):
     return get_job(job_id)
 
 
-def make_preview(input_dir, angle_degrees):
+def make_preview(
+    input_dir,
+    angle_degrees,
+    show_cutoff_line=True,
+    transition_width=90,
+    mode="soft_transition",
+    gaussian_sigma=3,
+):
+    if mode not in {"hard_boundary", "gaussian_smooth", "soft_transition"}:
+        mode = "soft_transition"
     volume = load_dicom_volume(input_dir)
     before = crop_head_neck(sagittal_mip(volume))
-    after = preview_deform_2d(before, float(angle_degrees))
+    before_display = draw_cutoff_line(before, volume.shape[0]) if show_cutoff_line else before
+    after = preview_deform_2d(
+        before_display,
+        float(angle_degrees),
+        mode,
+        transition_width=float(transition_width),
+        gaussian_sigma=float(gaussian_sigma),
+    )
+
+    canvas_image = Image.new("RGB", (1440, 520), (0, 0, 0))
+    canvas_image.paste(fit_image(before_display, 700, 520), (0, 0))
+    canvas_image.paste(fit_image(after, 700, 520), (740, 0))
 
     canvas = BytesIO()
-    preview = fit_image(after, 720, 520)
-    preview.save(canvas, format="PNG")
+    canvas_image.save(canvas, format="PNG")
     encoded = base64.b64encode(canvas.getvalue()).decode("ascii")
     return {
         "image": f"data:image/png;base64,{encoded}",
@@ -291,21 +672,116 @@ def make_preview(input_dir, angle_degrees):
     }
 
 
-def serialize_outputs(output_paths, preview_paths, zip_path=None):
+def serialize_outputs(output_paths, preview_paths):
     return {
         "outputs": {key: str(Path(value).resolve()) for key, value in output_paths.items()},
         "previews": {
             "comparison": str(Path(preview_paths["comparison"]).resolve()),
             "screenshots": str(Path(preview_paths["screenshots"]).resolve()),
         },
-        "zip": {
-            "path": str(Path(zip_path).resolve()),
-            "name": Path(zip_path).name,
-            "size": Path(zip_path).stat().st_size,
-        } if zip_path else None,
+        "zip": None,
+        "stateZips": {},
     }
 
 
+def file_metadata(file_path):
+    file_path = Path(file_path).resolve()
+    return {
+        "path": str(file_path),
+        "name": file_path.name,
+        "size": file_path.stat().st_size,
+    }
+
+
+def zip_selected_deformation_outputs(job_root, outputs, previews, package_options):
+    dicom_keys = package_options.get("dicom") or []
+    image_keys = package_options.get("images") or []
+    if not dicom_keys and not image_keys:
+        raise RuntimeError("请至少选择一个要打包的内容。")
+
+    zip_path = Path(job_root) / f"head_ct_morph_selected_{Path(job_root).name}.zip"
+    if zip_path.exists():
+        zip_path.unlink()
+
+    dicom_names = {
+        "original": "dicom/ct_original",
+        "hard_boundary": "dicom/ct_hard_boundary",
+        "gaussian_smooth": "dicom/ct_gaussian_smooth",
+        "soft_transition": "dicom/ct_soft_transition",
+    }
+    image_files = {
+        "comparison": Path(previews.get("comparison", "")),
+        "original": Path(previews.get("screenshots", "")) / "original.png",
+        "hard_boundary": Path(previews.get("screenshots", "")) / "hard_boundary.png",
+        "gaussian_smooth": Path(previews.get("screenshots", "")) / "gaussian_smooth.png",
+        "soft_transition": Path(previews.get("screenshots", "")) / "soft_transition.png",
+    }
+    image_names = {
+        "comparison": "images/process_comparison_4states.png",
+        "original": "images/original.png",
+        "hard_boundary": "images/hard_boundary.png",
+        "gaussian_smooth": "images/gaussian_smooth.png",
+        "soft_transition": "images/soft_transition.png",
+    }
+
+    with zipfile.ZipFile(zip_path, "w", compression=zipfile.ZIP_DEFLATED) as archive:
+        for key in dicom_keys:
+            if key not in dicom_names:
+                continue
+            source_dir = Path(outputs.get(key, ""))
+            if not source_dir.exists():
+                raise RuntimeError(f"{key} 的 DICOM 输出目录不存在。")
+            for file_path in source_dir.rglob("*"):
+                if file_path.is_file():
+                    archive.write(file_path, Path(dicom_names[key]) / file_path.relative_to(source_dir))
+
+        for key in image_keys:
+            if key not in image_files:
+                continue
+            source_file = image_files[key]
+            if not source_file.exists():
+                raise RuntimeError(f"{key} 的图片输出不存在。")
+            archive.write(source_file, image_names[key])
+
+    return zip_path
+
+
+def prepare_deformation_zip(job_id, target, package_options=None):
+    job = get_job(job_id)
+    if not job:
+        raise RuntimeError("任务不存在。")
+    if job.get("kind") != "deformation":
+        raise RuntimeError("该任务不是四状态生成任务。")
+    if job.get("status") != "completed":
+        raise RuntimeError("四状态任务尚未完成，无法下载。")
+
+    result = job.get("result") or {}
+    outputs = result.get("outputs") or {}
+    previews = result.get("previews") or {}
+    job_root = RESULT_DIR / job_id
+    if target == "all":
+        if package_options:
+            return zip_selected_deformation_outputs(job_root, outputs, previews, package_options)
+        output_dir = job_root / "four_state_output"
+        if not output_dir.exists():
+            raise RuntimeError("四状态输出目录不存在。")
+        return zip_folder(output_dir, job_root / f"head_ct_morph_{job_id}.zip")
+
+    state_labels = {
+        "original": "original",
+        "hard_boundary": "hard_boundary",
+        "gaussian_smooth": "gaussian_smooth",
+        "soft_transition": "soft_transition",
+    }
+    if target not in state_labels:
+        raise RuntimeError("未知的四状态下载类型。")
+
+    source_dir = Path(outputs.get(target, ""))
+    if not source_dir.exists():
+        raise RuntimeError("该状态的 DICOM 输出目录不存在。")
+    return zip_folder(source_dir, job_root / f"{target}_{job_id}.zip")
+
+
 class Handler(BaseHTTPRequestHandler):
     def log_message(self, format, *args):
         print("%s - %s" % (self.address_string(), format % args))
@@ -333,6 +809,19 @@ class Handler(BaseHTTPRequestHandler):
             self.send_json({"items": list_library()})
             return
 
+        if parsed.path == "/api/library/preview":
+            params = parse_qs(parsed.query)
+            item_id = params.get("id", [""])[0]
+            index = params.get("index", ["0"])[0]
+            self.send_json(make_library_slice_preview(item_id, index))
+            return
+
+        if parsed.path == "/api/library/info":
+            params = parse_qs(parsed.query)
+            item_id = params.get("id", [""])[0]
+            self.send_json(make_library_info(item_id))
+            return
+
         if parsed.path == "/api/job":
             params = parse_qs(parsed.query)
             job_id = params.get("id", [""])[0]
@@ -343,6 +832,27 @@ class Handler(BaseHTTPRequestHandler):
             self.send_json(job)
             return
 
+        if parsed.path == "/api/user/job":
+            params = parse_qs(parsed.query)
+            username = params.get("username", [""])[0]
+            kind = params.get("kind", ["deformation"])[0]
+            if kind not in ["deformation", "video"]:
+                self.send_json({"error": "未知任务类型。"}, status=400)
+                return
+            self.send_json({"job": get_user_task_job(username, kind)})
+            return
+
+        if parsed.path == "/api/deformation/download":
+            params = parse_qs(parsed.query)
+            job_id = params.get("job", [""])[0]
+            target = params.get("target", ["all"])[0]
+            try:
+                zip_path = prepare_deformation_zip(job_id, target)
+                self.send_file(zip_path, "application/zip", as_attachment=True)
+            except Exception as exc:
+                self.send_json({"error": str(exc)}, status=400)
+            return
+
         if parsed.path == "/api/file":
             params = parse_qs(parsed.query)
             file_path = Path(unquote(params.get("path", [""])[0])).resolve()
@@ -356,15 +866,11 @@ class Handler(BaseHTTPRequestHandler):
                 content_type = "video/mp4"
             elif file_path.suffix.lower() == ".zip":
                 content_type = "application/zip"
-            data = file_path.read_bytes()
-            self.send_response(200)
-            self.send_cors_headers()
-            self.send_header("Content-Type", content_type)
-            if file_path.suffix.lower() == ".zip":
-                self.send_header("Content-Disposition", f'attachment; filename="{file_path.name}"')
-            self.send_header("Content-Length", str(len(data)))
-            self.end_headers()
-            self.wfile.write(data)
+            self.send_file(
+                file_path,
+                content_type,
+                as_attachment=file_path.suffix.lower() == ".zip",
+            )
             return
 
         self.send_json({"error": "接口不存在。"}, status=404)
@@ -378,14 +884,57 @@ class Handler(BaseHTTPRequestHandler):
                 return
 
             body = self.read_json()
+            if parsed.path == "/api/demo/reset":
+                self.send_json(reset_demo_environment())
+                return
+
             if parsed.path == "/api/preview":
-                self.send_json(make_preview(body["inputDir"], body.get("angleDegrees", 12)))
+                self.send_json(
+                    make_preview(
+                        body["inputDir"],
+                        body.get("angleDegrees", 12),
+                        bool(body.get("showCutoffLine", True)),
+                        body.get("transitionWidth", 90),
+                        body.get("mode", "soft_transition"),
+                        body.get("gaussianSigma", 3),
+                    )
+                )
+                return
+
+            if parsed.path == "/api/deformation/package":
+                source_job_id = body["jobId"]
+                target = body.get("target", "all")
+                package_options = body.get("packageOptions")
+                username = normalized_username(body.get("username"))
+
+                def worker(job_id):
+                    label = "四状态总 ZIP" if target == "all" else "本状态 DICOM ZIP"
+                    set_job(job_id, message=f"正在打包{label}...", progress=10)
+                    zip_path = prepare_deformation_zip(source_job_id, target, package_options)
+                    set_job(job_id, message="打包完成，准备下载...", progress=95)
+                    return {"file": file_metadata(zip_path)}
+
+                self.send_json(
+                    start_job(
+                        "zip",
+                        worker,
+                        owner=username,
+                        params={
+                            "sourceJobId": source_job_id,
+                            "target": target,
+                            "packageOptions": package_options,
+                        },
+                        remember_user_task=False,
+                    ),
+                    status=202,
+                )
                 return
 
             if parsed.path == "/api/deformation":
                 input_dir = body["inputDir"]
                 angle_degrees = float(body.get("angleDegrees", 12))
                 transition_width = int(body.get("transitionWidth", 90))
+                username = normalized_username(body.get("username"))
 
                 def worker(job_id):
                     job_root = RESULT_DIR / job_id
@@ -393,7 +942,11 @@ class Handler(BaseHTTPRequestHandler):
                     reset_dir(job_root)
 
                     def progress(message):
-                        set_job(job_id, message=message)
+                        progress_value = deformation_progress_for_message(message)
+                        updates = {"message": message}
+                        if progress_value is not None:
+                            updates["progress"] = progress_value
+                        set_job(job_id, **updates)
 
                     output_paths, preview_paths = run_deformation(
                         input_dir,
@@ -402,27 +955,38 @@ class Handler(BaseHTTPRequestHandler):
                         transition_width,
                         progress,
                     )
-                    set_job(job_id, message="正在打包四状态输出 ZIP...")
-                    zip_path = zip_folder(
-                        output_dir,
-                        job_root / f"head_ct_morph_{job_id}.zip",
-                    )
-                    return serialize_outputs(output_paths, preview_paths, zip_path)
+                    return serialize_outputs(output_paths, preview_paths)
 
-                self.send_json(start_job("deformation", worker), status=202)
+                self.send_json(
+                    start_job(
+                        "deformation",
+                        worker,
+                        owner=username,
+                        params={
+                            "inputDir": input_dir,
+                            "angleDegrees": angle_degrees,
+                            "transitionWidth": transition_width,
+                        },
+                    ),
+                    status=202,
+                )
                 return
 
             if parsed.path == "/api/video":
                 input_dir = body["inputDir"]
                 max_angle = float(body.get("maxAngle", 20))
                 duration = float(body.get("durationSeconds", 6))
+                show_arrow = bool(body.get("showArrow", True))
+                mode = body.get("mode", "hard_boundary")
+                if mode not in {"hard_boundary", "gaussian_smooth", "soft_transition"}:
+                    mode = "hard_boundary"
 
                 def worker(job_id):
                     job_root = RESULT_DIR / job_id
                     reset_dir(job_root)
-                    output_file = job_root / f"head_extension_{job_id}.mp4"
-                    set_job(job_id, message="正在生成 0° 到目标角度的视频。")
-                    output = generate_video(input_dir, output_file, max_angle, duration)
+                    output_file = job_root / f"head_extension_{mode}_{job_id}.mp4"
+                    set_job(job_id, message=f"正在生成 {mode} 视频。")
+                    output = generate_video(input_dir, output_file, max_angle, duration, show_arrow, mode)
                     output = Path(output).resolve()
                     return {
                         "video": {
@@ -463,7 +1027,11 @@ class Handler(BaseHTTPRequestHandler):
         write_library_meta(remaining)
         upload_root = Path(target["dicomPath"]).resolve().parent
         if upload_root.exists() and upload_root.is_relative_to(LIBRARY_DIR.resolve()):
+            DICOM_FILE_CACHE.pop(str(Path(target["dicomPath"]).resolve()), None)
             shutil.rmtree(upload_root)
+        preview_cache = PREVIEW_CACHE_DIR / item_id
+        if preview_cache.exists():
+            shutil.rmtree(preview_cache)
         self.send_json({"ok": True, "items": remaining})
 
     def read_bytes(self):
@@ -478,6 +1046,22 @@ class Handler(BaseHTTPRequestHandler):
             return {}
         return json.loads(body.decode("utf-8"))
 
+    def send_file(self, file_path, content_type="application/octet-stream", as_attachment=False):
+        file_path = Path(file_path).resolve()
+        if not file_path.exists() or not file_path.is_file():
+            self.send_json({"error": "文件不存在。"}, status=404)
+            return
+
+        self.send_response(200)
+        self.send_cors_headers()
+        self.send_header("Content-Type", content_type)
+        if as_attachment:
+            self.send_header("Content-Disposition", f'attachment; filename="{file_path.name}"')
+        self.send_header("Content-Length", str(file_path.stat().st_size))
+        self.end_headers()
+        with file_path.open("rb") as file_handle:
+            shutil.copyfileobj(file_handle, self.wfile)
+
     def send_cors_headers(self):
         self.send_header("Access-Control-Allow-Origin", "*")
         self.send_header("Access-Control-Allow-Methods", "GET,POST,OPTIONS")
@@ -498,6 +1082,7 @@ def main():
     safe_mkdir(APP_DIR / "ppt_video")
     safe_mkdir(LIBRARY_DIR)
     safe_mkdir(RESULT_DIR)
+    load_persisted_jobs()
     server = ThreadingHTTPServer((HOST, PORT), Handler)
     print(f"Head CT Morph backend running at http://{HOST}:{PORT}")
     server.serve_forever()