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import sortInstancesByPosition from './sortInstancesByPosition';
// TODO: Is 10% a reasonable spacingTolerance for spacing?
const spacingTolerance = 0.2;
const iopTolerance = 0.01;
/**
* Checks if a series is reconstructable to a 3D volume.
*
* @param {Object[]} instances An array of `OHIFInstanceMetadata` objects.
*/
export default function isDisplaySetReconstructable(instances, appConfig) {
Iif (!instances.length) {
return { value: false };
}
const firstInstance = instances[0];
const isMultiframe = firstInstance.NumberOfFrames > 1;
if (appConfig) {
const rows = toNumber(firstInstance.Rows);
const columns = toNumber(firstInstance.Columns);
Iif (rows > appConfig.max3DTextureSize || columns > appConfig.max3DTextureSize) {
return { value: false };
}
}
// We used to check is reconstructable modalities here, but the logic is removed
// in favor of the calculation by metadata (orientation and positions)
// Can't reconstruct if we only have one image.
Iif (!isMultiframe && instances.length === 1) {
return { value: false };
}
// Can't reconstruct if all instances don't have the ImagePositionPatient.
Iif (!isMultiframe && !instances.every(instance => instance.ImagePositionPatient)) {
return { value: false };
}
const sortedInstances = sortInstancesByPosition(instances);
return isMultiframe ? processMultiframe(sortedInstances[0]) : processSingleframe(sortedInstances);
}
function hasPixelMeasurements(multiFrameInstance) {
const perFrameSequence = multiFrameInstance.PerFrameFunctionalGroupsSequence?.[0];
const sharedSequence = multiFrameInstance.SharedFunctionalGroupsSequence;
return (
Boolean(perFrameSequence?.PixelMeasuresSequence) ||
Boolean(sharedSequence?.PixelMeasuresSequence) ||
Boolean(
multiFrameInstance.PixelSpacing &&
(multiFrameInstance.SliceThickness || multiFrameInstance.SpacingBetweenFrames)
)
);
}
function hasOrientation(multiFrameInstance) {
const sharedSequence = multiFrameInstance.SharedFunctionalGroupsSequence;
const perFrameSequence = multiFrameInstance.PerFrameFunctionalGroupsSequence?.[0];
return (
Boolean(sharedSequence?.PlaneOrientationSequence) ||
Boolean(perFrameSequence?.PlaneOrientationSequence) ||
Boolean(
multiFrameInstance.ImageOrientationPatient ||
multiFrameInstance.DetectorInformationSequence?.[0]?.ImageOrientationPatient
)
);
}
function hasPosition(multiFrameInstance) {
const perFrameSequence = multiFrameInstance.PerFrameFunctionalGroupsSequence?.[0];
return (
Boolean(perFrameSequence?.PlanePositionSequence) ||
Boolean(perFrameSequence?.CTPositionSequence) ||
Boolean(
multiFrameInstance.ImagePositionPatient ||
multiFrameInstance.DetectorInformationSequence?.[0]?.ImagePositionPatient
)
);
}
function isNMReconstructable(multiFrameInstance) {
const imageSubType = multiFrameInstance.ImageType?.[2];
return imageSubType === 'RECON TOMO' || imageSubType === 'RECON GATED TOMO';
}
function processMultiframe(multiFrameInstance) {
// If we don't have the PixelMeasuresSequence, then the pixel spacing and
// slice thickness isn't specified or is changing and we can't reconstruct
// the dataset.
Iif (!hasPixelMeasurements(multiFrameInstance)) {
return { value: false };
}
Iif (!hasOrientation(multiFrameInstance)) {
console.log('No image orientation information, not reconstructable');
return { value: false };
}
Iif (!hasPosition(multiFrameInstance)) {
console.log('No image position information, not reconstructable');
return { value: false };
}
Iif (multiFrameInstance.Modality.includes('NM') && !isNMReconstructable(multiFrameInstance)) {
return { value: false };
}
// TODO - check spacing consistency
return { value: true };
}
function processSingleframe(instances) {
const firstImage = instances[0];
const firstImageRows = toNumber(firstImage.Rows);
const firstImageColumns = toNumber(firstImage.Columns);
const firstImageSamplesPerPixel = toNumber(firstImage.SamplesPerPixel);
const firstImageOrientationPatient = toNumber(firstImage.ImageOrientationPatient);
const firstImagePositionPatient = toNumber(firstImage.ImagePositionPatient);
// Can't reconstruct if we:
// -- Have a different dimensions within a displaySet.
// -- Have a different number of components within a displaySet.
// -- Have different orientations within a displaySet.
for (let i = 1; i < instances.length; i++) {
const instance = instances[i];
const { Rows, Columns, SamplesPerPixel, ImageOrientationPatient } = instance;
const imageOrientationPatient = toNumber(ImageOrientationPatient);
if (
Rows !== firstImageRows ||
Columns !== firstImageColumns ||
SamplesPerPixel !== firstImageSamplesPerPixel ||
!_isSameOrientation(imageOrientationPatient, firstImageOrientationPatient)
) {
return { value: false };
}
}
let missingFrames = 0;
let averageSpacingBetweenFrames;
// Check if frame spacing is approximately equal within a spacingTolerance.
// If spacing is on a uniform grid but we are missing frames,
// Allow reconstruction, but pass back the number of missing frames.
if (instances.length > 2) {
const lastIpp = toNumber(instances[instances.length - 1].ImagePositionPatient);
// We can't reconstruct if we are missing ImagePositionPatient values
Iif (!firstImagePositionPatient || !lastIpp) {
return { value: false };
}
averageSpacingBetweenFrames =
_getPerpendicularDistance(firstImagePositionPatient, lastIpp) / (instances.length - 1);
let previousImagePositionPatient = firstImagePositionPatient;
for (let i = 1; i < instances.length; i++) {
const instance = instances[i];
// Todo: get metadata from OHIF.MetadataProvider
const imagePositionPatient = toNumber(instance.ImagePositionPatient);
const spacingBetweenFrames = _getPerpendicularDistance(
imagePositionPatient,
previousImagePositionPatient
);
const spacingIssue = _getSpacingIssue(spacingBetweenFrames, averageSpacingBetweenFrames);
Iif (spacingIssue) {
const issue = spacingIssue.issue;
if (issue === reconstructionIssues.MISSING_FRAMES) {
missingFrames += spacingIssue.missingFrames;
} else Iif (issue === reconstructionIssues.IRREGULAR_SPACING) {
return { value: false };
}
}
previousImagePositionPatient = imagePositionPatient;
}
}
return { value: true, averageSpacingBetweenFrames };
}
function _isSameOrientation(iop1, iop2) {
Iif (iop1 === undefined || iop2 === undefined) {
return;
}
return (
Math.abs(iop1[0] - iop2[0]) < iopTolerance &&
Math.abs(iop1[1] - iop2[1]) < iopTolerance &&
Math.abs(iop1[2] - iop2[2]) < iopTolerance &&
Math.abs(iop1[3] - iop2[3]) < iopTolerance &&
Math.abs(iop1[4] - iop2[4]) < iopTolerance &&
Math.abs(iop1[5] - iop2[5]) < iopTolerance
);
}
/**
* Checks for spacing issues.
*
* @param {number} spacing The spacing between two frames.
* @param {number} averageSpacing The average spacing between all frames.
*
* @returns {Object} An object containing the issue and extra information if necessary.
*/
function _getSpacingIssue(spacing, averageSpacing) {
const equalWithinTolerance =
Math.abs(spacing - averageSpacing) < averageSpacing * spacingTolerance;
if (equalWithinTolerance) {
return;
}
const multipleOfAverageSpacing = spacing / averageSpacing;
const numberOfSpacings = Math.round(multipleOfAverageSpacing);
const errorForEachSpacing =
Math.abs(spacing - numberOfSpacings * averageSpacing) / numberOfSpacings;
Iif (errorForEachSpacing < spacingTolerance * averageSpacing) {
return {
issue: reconstructionIssues.MISSING_FRAMES,
missingFrames: numberOfSpacings - 1,
};
}
return { issue: reconstructionIssues.IRREGULAR_SPACING };
}
function _getPerpendicularDistance(a, b) {
return Math.sqrt(Math.pow(a[0] - b[0], 2) + Math.pow(a[1] - b[1], 2) + Math.pow(a[2] - b[2], 2));
}
const constructableModalities = ['MR', 'CT', 'PT', 'NM'];
const reconstructionIssues = {
MISSING_FRAMES: 'missingframes',
IRREGULAR_SPACING: 'irregularspacing',
};
export {
hasPixelMeasurements,
hasOrientation,
hasPosition,
isNMReconstructable,
_isSameOrientation,
_getSpacingIssue,
_getPerpendicularDistance,
reconstructionIssues,
constructableModalities,
};
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