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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 | 1x 3x 1x 27x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | import {
cache,
utilities,
Enums,
imageLoader,
imageLoadPoolManager,
getShouldUseSharedArrayBuffer,
} from '@cornerstonejs/core';
import type { Types } from '@cornerstonejs/core';
import { vec3 } from 'gl-matrix';
import { makeVolumeMetadata, sortImageIdsAndGetSpacing } from './helpers';
import StreamingImageVolume from './StreamingImageVolume';
const { createUint8SharedArray, createFloat32SharedArray } = utilities;
interface IVolumeLoader {
promise: Promise<StreamingImageVolume>;
cancel: () => void;
decache: () => void;
}
/**
* It handles loading of a image by streaming in its imageIds. It will be the
* volume loader if the schema for the volumeID is `cornerstoneStreamingImageVolume`.
* This function returns a promise that resolves to the StreamingImageVolume instance.
*
* In order to use the cornerstoneStreamingImageVolumeLoader you should use
* createAndCacheVolume helper from the cornerstone-core volumeLoader module.
*
* @param volumeId - The ID of the volume
* @param options - options for loading, imageIds
* @returns a promise that resolves to a StreamingImageVolume
*/
function cornerstoneStreamingImageVolumeLoader(
volumeId: string,
options: {
imageIds: string[];
}
): IVolumeLoader {
Iif (!options || !options.imageIds || !options.imageIds.length) {
throw new Error(
'ImageIds must be provided to create a streaming image volume'
);
}
Easync function getStreamingImageVolume() {
/**
* Check if we are using the `wadouri:` scheme, and if so, preload first,
* middle, and last image metadata as these are the images the current
* streaming image loader may explicitly request metadata from. The last image
* metadata would only be specifically requested if the imageId array order is
* reversed in the `sortImageIdsAndGetSpacing.ts` file.
*/
if (options.imageIds[0].split(':')[0] === 'wadouri') {
const [middleImageIndex, lastImageIndex] = [
Math.floor(options.imageIds.length / 2),
options.imageIds.length - 1,
];
const indexesToPrefetch = [0, middleImageIndex, lastImageIndex];
await Promise.all(
indexesToPrefetch.map((index) => {
return new Promise((resolve, reject) => {
const imageId = options.imageIds[index];
imageLoadPoolManager.addRequest(
async () => {
imageLoader
.loadImage(imageId)
.then(() => {
console.log(`Prefetched imageId: ${imageId}`);
resolve(true);
})
.catch((err) => {
reject(err);
});
},
Enums.RequestType.Prefetch,
{ volumeId },
1 // priority
);
});
})
).catch(console.error);
}
const { imageIds } = options;
const volumeMetadata = makeVolumeMetadata(imageIds);
const {
BitsAllocated,
PixelRepresentation,
PhotometricInterpretation,
ImageOrientationPatient,
PixelSpacing,
Columns,
Rows,
} = volumeMetadata;
const rowCosineVec = vec3.fromValues(
ImageOrientationPatient[0],
ImageOrientationPatient[1],
ImageOrientationPatient[2]
);
const colCosineVec = vec3.fromValues(
ImageOrientationPatient[3],
ImageOrientationPatient[4],
ImageOrientationPatient[5]
);
const scanAxisNormal = vec3.create();
vec3.cross(scanAxisNormal, rowCosineVec, colCosineVec);
const { zSpacing, origin, sortedImageIds } = sortImageIdsAndGetSpacing(
imageIds,
scanAxisNormal
);
const numFrames = imageIds.length;
// Spacing goes [1] then [0], as [1] is column spacing (x) and [0] is row spacing (y)
const spacing = <Types.Point3>[PixelSpacing[1], PixelSpacing[0], zSpacing];
const dimensions = <Types.Point3>[Columns, Rows, numFrames];
const direction = [
...rowCosineVec,
...colCosineVec,
...scanAxisNormal,
] as Types.Mat3;
const signed = PixelRepresentation === 1;
// Check if it fits in the cache before we allocate data
// TODO Improve this when we have support for more types
// NOTE: We use 4 bytes per voxel as we are using Float32.
const bytesPerVoxel = BitsAllocated === 16 ? 4 : 1;
const sizeInBytesPerComponent =
bytesPerVoxel * dimensions[0] * dimensions[1] * dimensions[2];
let numComponents = 1;
Iif (PhotometricInterpretation === 'RGB') {
numComponents = 3;
}
const sizeInBytes = sizeInBytesPerComponent * numComponents;
// check if there is enough space in unallocated + image Cache
const isCacheable = cache.isCacheable(sizeInBytes);
if (!isCacheable) {
throw new Error(Enums.Events.CACHE_SIZE_EXCEEDED);
}
cache.decacheIfNecessaryUntilBytesAvailable(sizeInBytes);
const useSharedArrayBuffer = getShouldUseSharedArrayBuffer();
const length = dimensions[0] * dimensions[1] * dimensions[2];
let scalarData;
switch (BitsAllocated) {
case 8:
if (signed) {
throw new Error(
'8 Bit signed images are not yet supported by this plugin.'
);
} else {
scalarData = useSharedArrayBuffer
? createUint8SharedArray(length)
: new Uint8Array(length);
}
break;
case 16:
scalarData = useSharedArrayBuffer
? createFloat32SharedArray(length)
: new Float32Array(length);
break;
case 24:
// hacky because we don't support alpha channel in dicom
scalarData = useSharedArrayBuffer
? createUint8SharedArray(length * numComponents)
: new Uint8Array(length * numComponents);
break;
}
const streamingImageVolume = new StreamingImageVolume(
// ImageVolume properties
{
volumeId,
metadata: volumeMetadata,
dimensions,
spacing,
origin,
direction,
scalarData,
sizeInBytes,
},
// Streaming properties
{
imageIds: sortedImageIds,
loadStatus: {
// todo: loading and loaded should be on ImageVolume
loaded: false,
loading: false,
cachedFrames: [],
callbacks: [],
},
}
);
return streamingImageVolume;
}
const streamingImageVolumePromise = getStreamingImageVolume();
return {
promise: streamingImageVolumePromise,
decache: () => {
streamingImageVolumePromise.then((streamingImageVolume) => {
streamingImageVolume.vtkOpenGLTexture.delete();
streamingImageVolume.scalarData = null;
streamingImageVolume = null;
});
},
cancel: () => {
streamingImageVolumePromise.then((streamingImageVolume) => {
streamingImageVolume.cancelLoading();
});
},
};
}
export default cornerstoneStreamingImageVolumeLoader;
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