66 lines
2.3 KiB
Plaintext
66 lines
2.3 KiB
Plaintext
import { metaData } from '@cornerstonejs/core';
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import cornerstoneDICOMImageLoader from '@cornerstonejs/dicom-image-loader';
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/**
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* preloads imageIds metadata in memory
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**/
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async function prefetchMetadataInformation(imageIdsToPrefetch) {
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for (let i = 0; i < imageIdsToPrefetch.length; i++) {
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await cornerstoneDICOMImageLoader.wadouri.loadImage(imageIdsToPrefetch[i])
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.promise;
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}
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}
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function getFrameInformation(imageId) {
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if (imageId.includes('wadors:')) {
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const frameIndex = imageId.indexOf('/frames/');
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const imageIdFrameless =
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frameIndex > 0 ? imageId.slice(0, frameIndex + 8) : imageId;
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return {
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frameIndex,
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imageIdFrameless,
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};
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} else {
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const frameIndex = imageId.indexOf('&frame=');
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let imageIdFrameless =
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frameIndex > 0 ? imageId.slice(0, frameIndex + 7) : imageId;
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if (!imageIdFrameless.includes('&frame=')) {
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imageIdFrameless = imageIdFrameless + '&frame=';
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}
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return {
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frameIndex,
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imageIdFrameless,
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};
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}
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}
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/**
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* Receives a list of imageids possibly referring to multiframe dicom images
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* and returns a list of imageid where each imageid referes to one frame.
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* For each imageId representing a multiframe image with n frames,
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* it will create n new imageids, one for each frame, and returns the new list of imageids
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* If a particular imageid no refer to a mutiframe image data, it will be just copied into the new list
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* @returns new list of imageids where each imageid represents a frame
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*/
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function convertMultiframeImageIds(imageIds) {
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const newImageIds = [];
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imageIds.forEach((imageId) => {
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const { imageIdFrameless } = getFrameInformation(imageId);
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const instanceMetaData = metaData.get('multiframeModule', imageId);
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if (
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instanceMetaData &&
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instanceMetaData.NumberOfFrames &&
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instanceMetaData.NumberOfFrames > 1
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) {
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const NumberOfFrames = instanceMetaData.NumberOfFrames;
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for (let i = 0; i < NumberOfFrames; i++) {
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const newImageId = imageIdFrameless + (i + 1);
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newImageIds.push(newImageId);
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}
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} else {
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newImageIds.push(imageId);
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}
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});
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return newImageIds;
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}
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export { convertMultiframeImageIds, prefetchMetadataInformation };
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