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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | 428x 428x 38445x 38445x 38445x 38445x 38445x 31982x 31982x 31982x 31982x 31982x 31982x 31982x 31982x 262564x 262564x 262564x 255525x 7039x 7039x 576x 6463x 6463x 4083x 2380x 2380x 2380x 2380x 2380x | import type { WADORSMetaData } from '../../types';
import imageIdToURI from '../imageIdToURI';
import { combineFrameInstance } from './combineFrameInstance';
let metadataByImageURI = [];
let multiframeMetadataByImageURI = {};
import getValue from './metaData/getValue';
// get metadata information for the first frame
function _retrieveMultiframeMetadataImageURI(imageURI) {
const lastSlashIdx = imageURI.indexOf('/frames/') + 8;
// imageid string without frame number
const imageIdFrameless = imageURI.slice(0, lastSlashIdx);
// calculating frame number
const frame = parseInt(imageURI.slice(lastSlashIdx), 10);
// retrieving the frame 1 that contains multiframe information
const metadata = metadataByImageURI[`${imageIdFrameless}1`];
return {
metadata,
frame,
};
}
function retrieveMultiframeMetadataImageId(imageId) {
const imageURI = imageIdToURI(imageId);
return _retrieveMultiframeMetadataImageURI(imageURI);
}
function isMultiframe(metadata) {
// test for presence of Shared Functional Groups Sequence or Per-Frame Functional Groups Sequence
Iif (
metadata['52009230'] !== undefined ||
metadata['52009229'] !== undefined
) {
return true;
}
// Checks if dicomTag NumberOf Frames exists and it is greater than one
const numberOfFrames = getValue<number>(metadata['00280008']);
return numberOfFrames && numberOfFrames > 1;
}
function add(imageId: string, metadata: WADORSMetaData) {
const imageURI = imageIdToURI(imageId);
Object.defineProperty(metadata, 'isMultiframe', {
value: isMultiframe(metadata),
enumerable: false,
});
metadataByImageURI[imageURI] = metadata;
}
// multiframes images will have only one imageId returned by the dicomweb
// client and registered in metadataByImageURI for all the n frames. If an
// imageId does not have metadata, or it does not have at all, or the imageID
// belongs to a frame, not registered in metadataByImageURI
function get(imageId: string): WADORSMetaData {
const imageURI = imageIdToURI(imageId);
// Check if the metadata is already available
const metadata = metadataByImageURI[imageURI];
if (metadata && !metadata?.isMultiframe) {
// Return the metadata for single-frame images
return metadata;
}
const cachedMetadata = multiframeMetadataByImageURI[imageURI];
if (cachedMetadata) {
return cachedMetadata;
}
// Try to get the metadata for a specific frame of a multiframe image
const retrievedMetadata = _retrieveMultiframeMetadataImageURI(imageURI);
if (!retrievedMetadata || !retrievedMetadata.metadata) {
return;
}
const { metadata: firstFrameMetadata, frame } = retrievedMetadata;
Eif (firstFrameMetadata) {
// Combine the metadata from the first frame with the metadata from the specified frame
const combined = combineFrameInstance(frame, firstFrameMetadata);
multiframeMetadataByImageURI[imageURI] = combined;
return combined;
}
}
function remove(imageId) {
const imageURI = imageIdToURI(imageId);
metadataByImageURI[imageURI] = undefined;
multiframeMetadataByImageURI[imageURI] = undefined;
}
function purge() {
metadataByImageURI = [];
multiframeMetadataByImageURI = {};
}
export { metadataByImageURI, isMultiframe, retrieveMultiframeMetadataImageId };
export default {
add,
get,
remove,
purge,
};
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