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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 | 216x 216x 216x 216x 216x 216x 216x 216x 17718x 17718x 17718x 17718x 17718x 64164x 17718x 216x | import { vec3 } from 'gl-matrix';
/**
* Given an array of imageIds, sort them based on their imagePositionPatient, and
* also returns the spacing between images and the origin of the reference image
*
* @param imageIds - array of imageIds
* @param scanAxisNormal - [x, y, z] array or gl-matrix vec3
*
* @returns The sortedImageIds, zSpacing, and origin of the first image in the series.
*/
export default function sortInstances(instances: Array<any>) {
// Return if only one instance e.g., multiframe
Iif (instances.length <= 1) {
return instances;
}
const { ImagePositionPatient: referenceImagePositionPatient, ImageOrientationPatient } =
instances[Math.floor(instances.length / 2)]; // this prevents getting scout image as test image
Iif (!referenceImagePositionPatient || !ImageOrientationPatient) {
return instances;
}
const rowCosineVec = vec3.fromValues(
ImageOrientationPatient[0],
ImageOrientationPatient[1],
ImageOrientationPatient[2]
);
const colCosineVec = vec3.fromValues(
ImageOrientationPatient[3],
ImageOrientationPatient[4],
ImageOrientationPatient[5]
);
const scanAxisNormal = vec3.cross(vec3.create(), rowCosineVec, colCosineVec);
const refIppVec = vec3.set(
vec3.create(),
referenceImagePositionPatient[0],
referenceImagePositionPatient[1],
referenceImagePositionPatient[2]
);
const distanceInstancePairs = instances.map(instance => {
const imagePositionPatient = instance.ImagePositionPatient;
const positionVector = vec3.create();
vec3.sub(positionVector, referenceImagePositionPatient, imagePositionPatient);
const distance = vec3.dot(positionVector, scanAxisNormal);
return {
distance,
instance,
};
});
distanceInstancePairs.sort((a, b) => b.distance - a.distance);
const sortedInstances = distanceInstancePairs.map(a => a.instance);
return sortedInstances;
}
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