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Enums,
imageRetrievalPoolManager,
utilities,
} from '@cornerstonejs/core';
import { Enums as csCoreEnums, type Types } from '@cornerstonejs/core';
import createImage from '../createImage';
import getPixelData from './getPixelData';
import type { DICOMLoaderIImage, DICOMLoaderImageOptions } from '../../types';
const { ProgressiveIterator } = utilities;
const { ImageQualityStatus } = Enums;
const streamableTransferSyntaxes = new Set<string>([
// Private HTJ2K
'3.2.840.10008.1.2.4.96',
// Released HTJ2K - only the RPCL one is definitely streamable.
'1.2.840.10008.1.2.4.202',
// HTJ2K lossy might be streamable, so try it. If it fails it is ok as it will
// proceed and eventually work.
'1.2.840.10008.1.2.4.203',
]);
/**
* Helper method to extract the transfer-syntax from the response of the server.
* @param {string} contentType The value of the content-type header as returned by the WADO-RS server.
* @return The transfer-syntax as announced by the server, or Implicit Little Endian by default.
*/
export function getTransferSyntaxForContentType(contentType: string): string {
const defaultTransferSyntax = '1.2.840.10008.1.2'; // Default is Implicit Little Endian.
Iif (!contentType) {
return defaultTransferSyntax;
}
// Browse through the content type parameters
const parameters = contentType.split(';');
const params: Record<string, string> = {};
parameters.forEach((parameter) => {
// Look for a transfer-syntax=XXXX pair
const parameterValues = parameter.split('=');
if (parameterValues.length !== 2) {
return;
}
const value = parameterValues[1].trim().replace(/"/g, '');
params[parameterValues[0].trim()] = value;
});
// This is useful if the PACS doesn't respond with a syntax
// in the content type.
// http://dicom.nema.org/medical/dicom/current/output/chtml/part18/chapter_6.html#table_6.1.1.8-3b
const defaultTransferSyntaxByType = {
'image/jpeg': '1.2.840.10008.1.2.4.50',
'image/x-dicom-rle': '1.2.840.10008.1.2.5',
'image/x-jls': '1.2.840.10008.1.2.4.80',
'image/jls': '1.2.840.10008.1.2.4.80',
'image/jll': '1.2.840.10008.1.2.4.70',
'image/jp2': '1.2.840.10008.1.2.4.90',
'image/jpx': '1.2.840.10008.1.2.4.92',
// Temporary types, until ratified by DICOM committed - TODO
'image/jphc': '3.2.840.10008.1.2.4.96',
'image/jxl': '1.2.840.10008.1.2.4.140',
};
if (params['transfer-syntax']) {
return params['transfer-syntax'];
} else Eif (
contentType &&
!Object.keys(params).length &&
defaultTransferSyntaxByType[contentType]
) {
// dcm4che seems to be reporting the content type as just 'image/jp2'?
return defaultTransferSyntaxByType[contentType];
} else if (params.type && defaultTransferSyntaxByType[params.type]) {
return defaultTransferSyntaxByType[params.type];
} else if (defaultTransferSyntaxByType[contentType]) {
return defaultTransferSyntaxByType[contentType];
}
return defaultTransferSyntax;
}
function getImageRetrievalPool() {
return imageRetrievalPoolManager;
}
export interface StreamingData {
url: string;
encodedData?: Uint8Array;
// Some values used by instances of streaming data for range
totalBytes?: number;
chunkSize?: number;
totalRanges?: number;
rangesFetched?: number;
}
export interface CornerstoneWadoRsLoaderOptions
extends DICOMLoaderImageOptions {
requestType?: csCoreEnums.RequestType;
additionalDetails?: {
imageId: string;
};
priority?: number;
addToBeginning?: boolean;
retrieveType?: string;
transferSyntaxUID?: string;
// Retrieve options are stored to provide sub-options for nested calls
retrieveOptions?: Types.RangeRetrieveOptions;
// Streaming data adds information about already streamed results.
streamingData?: StreamingData;
}
// TODO: load bulk data items that we might need
// Uncomment this on to test jpegls codec in OHIF
// const mediaType = 'multipart/related; type="image/x-jls"';
// const mediaType = 'multipart/related; type="application/octet-stream"; transfer-syntax="image/x-jls"';
const mediaType =
'multipart/related; type=application/octet-stream; transfer-syntax=*';
function loadImage(
imageId: string,
options: CornerstoneWadoRsLoaderOptions = {}
): Types.IImageLoadObject {
const imageRetrievalPool = getImageRetrievalPool();
const start = new Date().getTime();
const uncompressedIterator = new ProgressiveIterator<DICOMLoaderIImage>(
'decompress'
);
async function sendXHR(imageURI: string, imageId: string, mediaType: string) {
uncompressedIterator.generate(async (it) => {
// get the pixel data from the server
const compressedIt = ProgressiveIterator.as(
getPixelData(imageURI, imageId, mediaType, options)
);
let lastDecodeLevel = 10;
for await (const result of compressedIt) {
const {
pixelData,
imageQualityStatus = ImageQualityStatus.FULL_RESOLUTION,
percentComplete,
done = true,
extractDone = true,
} = result;
const transferSyntax = getTransferSyntaxForContentType(
result.contentType
);
Iif (!extractDone && !streamableTransferSyntaxes.has(transferSyntax)) {
continue;
}
const decodeLevel =
result.decodeLevel ??
(imageQualityStatus === ImageQualityStatus.FULL_RESOLUTION
? 0
: decodeLevelFromComplete(
percentComplete,
options.retrieveOptions?.decodeLevel
));
Iif (!done && lastDecodeLevel <= decodeLevel) {
// No point trying again yet
continue;
}
try {
const useOptions = {
...options,
decodeLevel,
};
const image = (await createImage(
imageId,
pixelData,
transferSyntax,
useOptions
)) as DICOMLoaderIImage;
// add the loadTimeInMS property
const end = new Date().getTime();
image.loadTimeInMS = end - start;
image.transferSyntaxUID = transferSyntax;
image.imageQualityStatus = imageQualityStatus;
// The iteration is done even if the image itself isn't done yet
it.add(image, done);
lastDecodeLevel = decodeLevel;
} catch (e) {
if (extractDone) {
console.warn("Couldn't decode", e);
throw e;
}
}
}
});
}
const requestType =
options.requestType || csCoreEnums.RequestType.Interaction;
const additionalDetails = options.additionalDetails || { imageId };
const priority = options.priority === undefined ? 5 : options.priority;
const uri = imageId.substring(7);
imageRetrievalPool.addRequest(
sendXHR.bind(this, uri, imageId, mediaType),
requestType,
additionalDetails,
priority
);
return {
promise: uncompressedIterator.getDonePromise(),
cancelFn: undefined,
};
}
/** The decode level is based on how much of hte data is needed for
* each level. It is a square function, so
* level 4 only needs 1/25 of the data (eg (4+1)^2). Add 2% to ensure
* there is enough space
*/
function decodeLevelFromComplete(percent: number, retrieveDecodeLevel = 4) {
const testSize = percent / 100 - 0.02;
if (testSize > 1 / 4) {
return Math.min(retrieveDecodeLevel, 0);
}
if (testSize > 1 / 16) {
return Math.min(retrieveDecodeLevel, 1);
}
if (testSize > 1 / 64) {
return Math.min(retrieveDecodeLevel, 2);
}
return Math.min(retrieveDecodeLevel, 3);
}
export default loadImage;
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