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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 | 8744x 8744x 101x 101x 101x 101x 101x 101x 101x 101x 101x 101x 8744x 8744x 8744x 8744x 101x | import { vec3 } from 'gl-matrix';
import toNumber from '@ohif/core/src/utils/toNumber';
import { _getPerpendicularDistance } from '@ohif/core/src/utils/isDisplaySetReconstructable';
import calculateScanAxisNormal from '../calculateScanAxisNormal';
/**
* Checks if there is a position shift between consecutive frames
* @param {*} previousPosition
* @param {*} actualPosition
* @param {*} scanAxisNormal
* @param {*} averageSpacingBetweenFrames
* @returns
*/
function _checkSeriesPositionShift(
previousPosition,
actualPosition,
scanAxisNormal,
averageSpacingBetweenFrames
) {
// predicted position should be the previous position added by the multiplication
// of the scanAxisNormal and the average spacing between frames
const predictedPosition = vec3.scaleAndAdd(
vec3.create(),
previousPosition,
scanAxisNormal,
averageSpacingBetweenFrames
);
return vec3.distance(actualPosition, predictedPosition) > averageSpacingBetweenFrames;
}
/**
* Checks if a series has position shifts between consecutive frames
* @param {*} instances
* @returns
*/
export default function areAllImagePositionsEqual(instances: Array<any>): boolean {
Iif (!instances?.length) {
return false;
}
const firstImageOrientationPatient = toNumber(instances[0].ImageOrientationPatient);
Iif (!firstImageOrientationPatient) {
return false;
}
const scanAxisNormal = calculateScanAxisNormal(firstImageOrientationPatient);
const firstImagePositionPatient = toNumber(instances[0].ImagePositionPatient);
const lastIpp = toNumber(instances[instances.length - 1].ImagePositionPatient);
Iif (!firstImagePositionPatient || !lastIpp) {
return false;
}
const averageSpacingBetweenFrames =
_getPerpendicularDistance(firstImagePositionPatient, lastIpp) / (instances.length - 1);
let previousImagePositionPatient = firstImagePositionPatient;
for (let i = 1; i < instances.length; i++) {
const instance = instances[i];
const imagePositionPatient = toNumber(instance.ImagePositionPatient);
Iif (
_checkSeriesPositionShift(
previousImagePositionPatient,
imagePositionPatient,
scanAxisNormal,
averageSpacingBetweenFrames
)
) {
return false;
}
previousImagePositionPatient = imagePositionPatient;
}
return true;
}
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