@cornerstonejs/dicom-image-loader
Version:
Cornerstone Image Loader for DICOM WADO-URI and WADO-RS and Local file
80 lines (79 loc) • 3.74 kB
JavaScript
function getLutDescriptor(dataSet, tag) {
if (!dataSet.elements[tag] || dataSet.elements[tag].length !== 6) {
return;
}
return [
dataSet.uint16(tag, 0),
dataSet.uint16(tag, 1),
dataSet.uint16(tag, 2),
];
}
function getLutData(lutDataSet, tag, lutDescriptor) {
const lut = [];
const lutData = lutDataSet.elements[tag];
for (let i = 0; i < lutDescriptor[0]; i++) {
if (lutDescriptor[2] === 16) {
lut[i] = lutDataSet.uint16(tag, i);
}
else {
lut[i] = lutDataSet.byteArray[i + lutData.dataOffset];
}
}
return lut;
}
function populatePaletteColorLut(dataSet, imagePixelModule) {
imagePixelModule.redPaletteColorLookupTableDescriptor = getLutDescriptor(dataSet, 'x00281101');
imagePixelModule.greenPaletteColorLookupTableDescriptor = getLutDescriptor(dataSet, 'x00281102');
imagePixelModule.bluePaletteColorLookupTableDescriptor = getLutDescriptor(dataSet, 'x00281103');
if (imagePixelModule.redPaletteColorLookupTableDescriptor[0] === 0) {
imagePixelModule.redPaletteColorLookupTableDescriptor[0] = 65536;
imagePixelModule.greenPaletteColorLookupTableDescriptor[0] = 65536;
imagePixelModule.bluePaletteColorLookupTableDescriptor[0] = 65536;
}
const numLutEntries = imagePixelModule.redPaletteColorLookupTableDescriptor[0];
const lutData = dataSet.elements.x00281201;
const lutBitsAllocated = lutData.length === numLutEntries ? 8 : 16;
if (imagePixelModule.redPaletteColorLookupTableDescriptor[2] !==
lutBitsAllocated) {
imagePixelModule.redPaletteColorLookupTableDescriptor[2] = lutBitsAllocated;
imagePixelModule.greenPaletteColorLookupTableDescriptor[2] =
lutBitsAllocated;
imagePixelModule.bluePaletteColorLookupTableDescriptor[2] =
lutBitsAllocated;
}
imagePixelModule.redPaletteColorLookupTableData = getLutData(dataSet, 'x00281201', imagePixelModule.redPaletteColorLookupTableDescriptor);
imagePixelModule.greenPaletteColorLookupTableData = getLutData(dataSet, 'x00281202', imagePixelModule.greenPaletteColorLookupTableDescriptor);
imagePixelModule.bluePaletteColorLookupTableData = getLutData(dataSet, 'x00281203', imagePixelModule.bluePaletteColorLookupTableDescriptor);
}
function populateSmallestLargestPixelValues(dataSet, imagePixelModule) {
const pixelRepresentation = dataSet.uint16('x00280103');
if (pixelRepresentation === 0) {
imagePixelModule.smallestPixelValue = dataSet.uint16('x00280106');
imagePixelModule.largestPixelValue = dataSet.uint16('x00280107');
}
else {
imagePixelModule.smallestPixelValue = dataSet.int16('x00280106');
imagePixelModule.largestPixelValue = dataSet.int16('x00280107');
}
}
function getImagePixelModule(dataSet) {
const imagePixelModule = {
samplesPerPixel: dataSet.uint16('x00280002'),
photometricInterpretation: dataSet.string('x00280004'),
rows: dataSet.uint16('x00280010'),
columns: dataSet.uint16('x00280011'),
bitsAllocated: dataSet.uint16('x00280100'),
bitsStored: dataSet.uint16('x00280101'),
highBit: dataSet.uint16('x00280102'),
pixelRepresentation: dataSet.uint16('x00280103'),
planarConfiguration: dataSet.uint16('x00280006'),
pixelAspectRatio: dataSet.string('x00280034'),
};
populateSmallestLargestPixelValues(dataSet, imagePixelModule);
if (imagePixelModule.photometricInterpretation === 'PALETTE COLOR' &&
dataSet.elements.x00281101) {
populatePaletteColorLut(dataSet, imagePixelModule);
}
return imagePixelModule;
}
export default getImagePixelModule;