@cleerlycode/cornerstone-wado-image-loader/src/imageLoader/wadouri/getEncapsulatedImageFrame.js

Cornerstone ImageLoader for DICOM WADO-URI

import { dicomParser } from '../../externalModules.js';

/**
 * Function to deal with extracting an image frame from an encapsulated data set.
 */


function framesAreFragmented (dataSet) {
  const numberOfFrames = dataSet.intString('x00280008');
  const pixelDataElement = dataSet.elements.x7fe00010;

  return (numberOfFrames !== pixelDataElement.fragments.length);
}

export default function getEncapsulatedImageFrame (dataSet, frameIndex) {
  if (dataSet.elements.x7fe00010 && dataSet.elements.x7fe00010.basicOffsetTable.length) {
    // Basic Offset Table is not empty
    return dicomParser.readEncapsulatedImageFrame(dataSet, dataSet.elements.x7fe00010, frameIndex);
  }

  // Empty basic offset table

  if (framesAreFragmented(dataSet)) {
    const basicOffsetTable = dicomParser.createJPEGBasicOffsetTable(dataSet, dataSet.elements.x7fe00010);

    return dicomParser.readEncapsulatedImageFrame(dataSet, dataSet.elements.x7fe00010, frameIndex, basicOffsetTable);
  }

  return dicomParser.readEncapsulatedPixelDataFromFragments(dataSet, dataSet.elements.x7fe00010, frameIndex);
}