2026-05-07-17-28-34 实现DICOM与模型三维融合视角

WebSite/server.ts

@@ -618,6 +618,53 @@ function createReformattedPreview(files: string[], plane: Exclude<DicomPlane, 'a
   };
 }
 
+function createDicomFusionVolume(files: string[], start: number, end: number, mode: DicomDisplayMode) {
+  const volume = getDicomVolume(files, mode);
+  const total = volume.frames.length;
+  const safeStart = Math.max(0, Math.min(total - 1, Number.isFinite(start) ? start : 0));
+  const safeEnd = Math.max(safeStart, Math.min(total - 1, Number.isFinite(end) ? end : safeStart + 49));
+  const maxFrames = 64;
+  const rangeLength = safeEnd - safeStart + 1;
+  const step = Math.max(1, Math.ceil(rangeLength / maxFrames));
+  const indices: number[] = [];
+  for (let index = safeStart; index <= safeEnd; index += step) {
+    indices.push(index);
+  }
+  if (indices[indices.length - 1] !== safeEnd) {
+    indices.push(safeEnd);
+  }
+
+  const maxTextureDimension = 256;
+  const textureScale = Math.min(1, maxTextureDimension / Math.max(volume.width, volume.height));
+  const targetWidth = Math.max(1, Math.round(volume.width * textureScale));
+  const targetHeight = Math.max(1, Math.round(volume.height * textureScale));
+  const frames = indices.map((index) => (
+    resampleNearest(volume.frames[index], volume.width, volume.height, targetWidth, targetHeight).toString('base64')
+  ));
+
+  return {
+    width: targetWidth,
+    height: targetHeight,
+    start: safeStart,
+    end: safeEnd,
+    total,
+    indices,
+    frames,
+    mode,
+    spacing: {
+      row: volume.rowSpacing,
+      column: volume.columnSpacing,
+      slice: volume.sliceSpacing,
+    },
+    physicalSize: {
+      width: volume.width * volume.columnSpacing,
+      height: volume.height * volume.rowSpacing,
+      depth: Math.max(1, rangeLength) * volume.sliceSpacing,
+      unit: 'mm',
+    },
+  };
+}
+
 function enhanceDicomEdges(pixels: Buffer, width: number, height: number) {
   if (width < 3 || height < 3) {
     return pixels;
@@ -1055,6 +1102,31 @@ async function startServer() {
     }
   });
 
+  app.get('/api/projects/:projectId/dicom-fusion-volume', (req, res) => {
+    const project = findProject(readState(), req.params.projectId);
+    if (!project) {
+      res.status(404).json({ message: '项目不存在' });
+      return;
+    }
+
+    const files = getProjectDicomFiles(project);
+    if (!files.length) {
+      res.status(404).json({ message: '当前项目没有可融合的 DICOM 文件' });
+      return;
+    }
+
+    const requestedMode = String(req.query.mode ?? 'soft');
+    const mode: DicomDisplayMode = requestedMode === 'bone' || requestedMode === 'soft' || requestedMode === 'contrast' ? requestedMode : 'soft';
+    const start = Number.parseInt(String(req.query.start ?? '0'), 10);
+    const end = Number.parseInt(String(req.query.end ?? '49'), 10);
+
+    try {
+      res.json(createDicomFusionVolume(files, start, end, mode));
+    } catch (error) {
+      res.status(422).json({ message: error instanceof Error ? error.message : 'DICOM 三维融合体生成失败' });
+    }
+  });
+
   app.get('/api/projects/:projectId/dicom-archive', (req, res) => {
     const project = findProject(readState(), req.params.projectId);
     if (!project) {