feat: Enhance orientation and position extraction from DICOM datasets…

packages/dicomImageLoader/src/imageLoader/wadouri/metaData/extractPositioningFromDataset.ts

@@ -101,6 +101,26 @@ function extractOrientationFromDataset(dataSet) {
       extractOrientationFromNMMultiframeDataset(dataSet);
   }
 
+  // If orientation not valid to this point, trying to get the orientation from
+  // Per-frame Functional Groups Sequence (5200,9230). This is commonly used
+  // in enhanced multiframe DICOMs. Only the first frame is considered.
+  if (
+    !imageOrientationPatient &&
+    dataSet.elements.x52009230 &&
+    dataSet.elements.x52009230.items?.length > 0
+  ) {
+    const frame0 = dataSet.elements.x52009230.items[0].dataSet;
+    const planeOrientationSeq = frame0.elements?.x00209116?.items?.[0]?.dataSet;
+
+    if (planeOrientationSeq) {
+      imageOrientationPatient = getNumberValues(
+        planeOrientationSeq,
+        'x00200037',
+        6
+      );
+    }
+  }
+
   return imageOrientationPatient;
 }
 
@@ -129,6 +149,18 @@ function extractPositionFromDataset(dataSet) {
     imagePositionPatient = extractPositionFromNMMultiframeDataset(dataSet);
   }
 
+  // If position not valid to this point, trying to get the position from
+  // Per-frame Functional Groups Sequence (5200,9230). This is commonly used
+  // in enhanced multiframe DICOMs. Only the first frame is considered.
+  if (!imagePositionPatient && dataSet.elements.x52009230?.items?.length > 0) {
+    const frame0 = dataSet.elements.x52009230.items[0].dataSet;
+    const planePositionSeq = frame0.elements?.x00209113?.items?.[0]?.dataSet;
+
+    if (planePositionSeq) {
+      imagePositionPatient = getNumberValues(planePositionSeq, 'x00200032', 3);
+    }
+  }
+
   return imagePositionPatient;
 }
 
@@ -151,6 +183,17 @@ function extractSpacingFromDataset(dataSet) {
     );
   }
 
+  // If pixelSpacing not valid to this point, trying to get the spacing
+  // from the SharedFunctionalGroupsSequence
+  if (!pixelSpacing && dataSet.elements.x52009229?.items?.length > 0) {
+    const shared = dataSet.elements.x52009229.items[0].dataSet;
+    const pixelMeasuresSeq = shared.elements?.x00289110?.items?.[0]?.dataSet;
+
+    if (pixelMeasuresSeq) {
+      pixelSpacing = getNumberValues(pixelMeasuresSeq, 'x00280030', 2);
+    }
+  }
+
   return pixelSpacing;
 }