revert: 恢复误删文件（回退 81f500160）

MD/test/3d_samples/dicom_metadata.json

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+{
+  "patientInfo": {
+    "patientName": "刘潇凡",
+    "patientID": "PN0000000006",
+    "birthDate": "2007-04-29",
+    "sex": "M",
+    "age": "19Y"
+  },
+  "studyInfo": {
+    "studyDate": "2026-06-06",
+    "studyTime": "14:30:22",
+    "studyDescription": "胸部CT平扫+三维重建",
+    "studyInstanceUID": "1.2.840.113619.2.55.3.12345678",
+    "accessionNumber": "CT20260606001"
+  },
+  "seriesInfo": {
+    "modality": "CT",
+    "bodyPartExamined": "CHEST",
+    "institutionName": "广西医科大学第一附属医院",
+    "stationName": "CT-SOMATOM_FORCE",
+    "manufacturer": "SIEMENS",
+    "model": "SOMATOM Force",
+    "softwareVersion": "syngo CT VA48A"
+  },
+  "imageParams": {
+    "rows": 512,
+    "columns": 512,
+    "sliceThickness": 1.25,
+    "pixelSpacing": [
+      0.625,
+      0.625
+    ],
+    "kvp": 120,
+    "mas": 200,
+    "rotationTime": 0.5,
+    "pitch": 0.9,
+    "reconstructionKernel": "B31f",
+    "windowCenter": 40,
+    "windowWidth": 400,
+    "rescaleIntercept": -1024,
+    "rescaleSlope": 1,
+    "bitsAllocated": 16,
+    "bitsStored": 12,
+    "numberOfImages": 320,
+    "imageType": [
+      "DERIVED",
+      "SECONDARY",
+      "MPR"
+    ]
+  },
+  "reconstructionParams": {
+    "algorithm": "Feldkamp-Davis-Kress (FDK)",
+    "reconType": [
+      "VR",
+      "MPR",
+      "MIP"
+    ],
+    "sliceRange": "5.0mm - 350.0mm",
+    "fieldOfView": 350,
+    "matrixSize": [
+      512,
+      512
+    ],
+    "voxelSize": [
+      0.684,
+      0.684,
+      1.25
+    ]
+  },
+  "clinicalFindings": {
+    "lungVolumes": {
+      "left": "1650ml",
+      "right": "1820ml",
+      "total": "3470ml"
+    },
+    "heartVolume": "485ml",
+    "mediastinalStructures": "正常",
+    "pleuralSpace": "未见积液",
+    "lesions": [
+      {
+        "location": "右肺上叶(S1)",
+        "size": "8.5mm x 7.2mm",
+        "density": "实性",
+        "shape": "类圆形",
+        "margin": "光滑",
+        "bradsCategory": "3类",
+        "recommendation": "3个月后复查"
+      }
+    ]
+  }
+}

MD/test/3d_samples/volumes/phantom_volume.raw

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