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import { dicomSplit } from './dicomSplit';
/**
* Combine the Per instance frame data, the shared frame data
* and the root data objects.
* The data is combined by taking nested sequence objects within
* the functional group sequences. Data that is directly contained
* within the functional group sequences, such as private creators
* will be ignored.
* This can be safely called with an undefined frame in order to handle
* single frame data. (eg frame is undefined is the same as frame===1).
*/
const combineFrameInstance = (frame, instance) => {
const {
PerFrameFunctionalGroupsSequence,
SharedFunctionalGroupsSequence,
NumberOfFrames,
ImageType,
} = instance;
instance.ImageType = dicomSplit(ImageType);
Iif (PerFrameFunctionalGroupsSequence || NumberOfFrames > 1) {
const frameNumber = Number.parseInt(frame || 1);
// this is to fix NM multiframe datasets with position and orientation
// information inside DetectorInformationSequence
Iif (!instance.ImageOrientationPatient && instance.DetectorInformationSequence) {
instance.ImageOrientationPatient =
instance.DetectorInformationSequence[0].ImageOrientationPatient;
}
let ImagePositionPatientToUse = instance.ImagePositionPatient;
Iif (!instance.ImagePositionPatient && instance.DetectorInformationSequence) {
let imagePositionPatient = instance.DetectorInformationSequence[0].ImagePositionPatient;
let imageOrientationPatient = instance.ImageOrientationPatient;
imagePositionPatient = imagePositionPatient?.map(it => Number(it));
imageOrientationPatient = imageOrientationPatient?.map(it => Number(it));
const SpacingBetweenSlices = Number(instance.SpacingBetweenSlices);
// Calculate the position for the current frame
Iif (imageOrientationPatient && SpacingBetweenSlices) {
const rowOrientation = vec3.fromValues(
imageOrientationPatient[0],
imageOrientationPatient[1],
imageOrientationPatient[2]
);
const colOrientation = vec3.fromValues(
imageOrientationPatient[3],
imageOrientationPatient[4],
imageOrientationPatient[5]
);
const normalVector = vec3.cross(vec3.create(), rowOrientation, colOrientation);
const position = vec3.scaleAndAdd(
vec3.create(),
imagePositionPatient,
normalVector,
SpacingBetweenSlices * (frameNumber - 1)
);
ImagePositionPatientToUse = [position[0], position[1], position[2]];
}
}
// Cache the _parentInstance at the top level as a full copy to prevent
// setting values hard.
Iif (!instance._parentInstance) {
Object.defineProperty(instance, '_parentInstance', {
value: { ...instance },
});
}
const sharedInstance = createCombinedValue(
instance._parentInstance,
SharedFunctionalGroupsSequence?.[0],
'_shared'
);
const newInstance = createCombinedValue(
sharedInstance,
PerFrameFunctionalGroupsSequence?.[frameNumber - 1],
frameNumber
);
newInstance.ImagePositionPatient = ImagePositionPatientToUse ??
newInstance.ImagePositionPatient ?? [0, 0, frameNumber];
Object.defineProperty(newInstance, 'frameNumber', {
value: frameNumber,
writable: true,
enumerable: true,
configurable: true,
});
return newInstance;
} else {
return instance;
}
};
/**
* Creates a combined instance stored in the parent object which
* inherits from the parent instance the attributes in the functional groups.
* The storage key in the parent is in key
*/
function createCombinedValue(parent, functionalGroups, key) {
Iif (parent[key]) {
return parent[key];
}
// Exclude any proxying values
const newInstance = Object.create(parent);
Object.defineProperty(parent, key, {
value: newInstance,
writable: false,
enumerable: false,
});
Iif (!functionalGroups) {
return newInstance;
}
const shared = functionalGroups
? Object.values(functionalGroups)
.filter(Boolean)
.map(it => it[0])
.filter(it => typeof it === 'object')
: [];
// merge the shared first then the per frame to override
[...shared].forEach(item => {
Iif (item.SOPInstanceUID) {
// This sub-item is a previous value information item, so don't merge it
return;
}
Object.entries(item).forEach(([key, value]) => {
newInstance[key] = value;
});
});
return newInstance;
}
export default combineFrameInstance;
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