src_dicom_dicomSegmentFrameInfo.js
import {getSpacingFromMeasure} from './dicomElementsWrapper';
import {logger} from '../utils/logger';
import {arrayEquals} from '../utils/array';
// doc imports
/* eslint-disable no-unused-vars */
import {DataElement} from './dataElement';
import {Spacing} from '../image/spacing';
/* eslint-enable no-unused-vars */
/**
* DICOM segment frame info: item of a
* PerframeFunctionalGroupsSequence (5200,9230).
*
* Ref: {@link https://dicom.nema.org/medical/dicom/2022a/output/chtml/part03/sect_C.7.6.16.html}.
*/
export class DicomSegmentFrameInfo {
/**
* The dimension index.
*
* @type {number[]}
*/
dimIndex;
/**
* The frame image position patient.
*
* @type {number[]}
*/
imagePosPat;
/**
* List of derivation images.
*
* @type {Array}
*/
derivationImages;
/**
* The reference segment number.
*
* @type {number}
*/
refSegmentNumber;
/**
* The frame image orientation.
*
* @type {number[]|undefined}
*/
imageOrientationPatient;
/**
* The frame spacing.
*
* @type {Spacing|undefined}
*/
spacing;
/**
* @param {number[]} dimIndex The dimension index.
* @param {number[]} imagePosPat The frame image position patient.
* @param {Array} derivationImages List of derivation images.
* @param {number} refSegmentNumber The reference segment number.
*/
constructor(dimIndex, imagePosPat, derivationImages, refSegmentNumber) {
this.dimIndex = dimIndex;
this.imagePosPat = imagePosPat;
this.derivationImages = derivationImages;
this.refSegmentNumber = refSegmentNumber;
}
}
/**
* Get a frame information object from a dicom element.
*
* @param {Object<string, DataElement>} dataElements The dicom element.
* @returns {DicomSegmentFrameInfo} A frame information object.
*/
export function getSegmentFrameInfo(dataElements) {
// Derivation Image Sequence
const derivationImages = [];
if (typeof dataElements['00089124'] !== 'undefined') {
const derivationImageSq = dataElements['00089124'].value;
// Source Image Sequence
for (let i = 0; i < derivationImageSq.length; ++i) {
const sourceImages = [];
if (typeof derivationImageSq[i]['00082112'] !== 'undefined') {
const sourceImageSq = derivationImageSq[i]['00082112'].value;
for (let j = 0; j < sourceImageSq.length; ++j) {
const sourceImage = {};
// Referenced SOP Class UID
if (typeof sourceImageSq[j]['00081150'] !== 'undefined') {
sourceImage.referencedSOPClassUID =
sourceImageSq[j]['00081150'].value[0];
}
// Referenced SOP Instance UID
if (typeof sourceImageSq[j]['00081155'] !== 'undefined') {
sourceImage.referencedSOPInstanceUID =
sourceImageSq[j]['00081155'].value[0];
}
sourceImages.push(sourceImage);
}
}
derivationImages.push({
sourceImages: sourceImages
});
}
}
// Frame Content Sequence (required, only one)
const frameContentSq = dataElements['00209111'].value;
// Dimension Index Value
const dimIndex = frameContentSq[0]['00209157'].value;
// Segment Identification Sequence (required, only one)
const segmentIdSq = dataElements['0062000A'].value;
// Referenced Segment Number
const refSegmentNumber = parseInt(segmentIdSq[0]['0062000B'].value[0], 0);
// Plane Position Sequence (required, only one)
const planePosSq = dataElements['00209113'].value;
// Image Position (Patient) (conditionally required)
const imagePosPat = planePosSq[0]['00200032'].value;
for (let p = 0; p < imagePosPat.length; ++p) {
imagePosPat[p] = parseFloat(imagePosPat[p]);
}
const frameInfo = new DicomSegmentFrameInfo(
dimIndex,
imagePosPat,
derivationImages,
refSegmentNumber
);
// Plane Orientation Sequence
if (typeof dataElements['00209116'] !== 'undefined') {
const framePlaneOrientationSeq = dataElements['00209116'];
if (framePlaneOrientationSeq.value.length !== 0) {
// should only be one Image Orientation (Patient)
const frameImageOrientation =
framePlaneOrientationSeq.value[0]['00200037'].value;
if (typeof frameImageOrientation !== 'undefined') {
frameInfo.imageOrientationPatient = frameImageOrientation;
}
}
}
// Pixel Measures Sequence
if (typeof dataElements['00289110'] !== 'undefined') {
const framePixelMeasuresSeq = dataElements['00289110'];
if (framePixelMeasuresSeq.value.length !== 0) {
// should only be one
const frameSpacing =
getSpacingFromMeasure(framePixelMeasuresSeq.value[0]);
if (typeof frameSpacing !== 'undefined') {
frameInfo.spacing = frameSpacing;
}
} else {
logger.warn(
'No shared functional group pixel measure sequence items.');
}
}
return frameInfo;
}
/**
* Check if two frame info objects are equal.
*
* @param {DicomSegmentFrameInfo} dsfi1 The first frame info.
* @param {DicomSegmentFrameInfo} dsfi2 The second frame info.
* @returns {boolean} True if both frame info are equal.
*/
export function isEqualSegmentFrameInfo(dsfi1, dsfi2) {
// basics
if (typeof dsfi1 === 'undefined' ||
typeof dsfi2 === 'undefined' ||
dsfi1 === null ||
dsfi2 === null) {
return false;
}
let isEqual =
arrayEquals(dsfi1.dimIndex, dsfi2.dimIndex) &&
arrayEquals(dsfi1.imagePosPat, dsfi2.imagePosPat) &&
dsfi1.refSegmentNumber === dsfi2.refSegmentNumber;
isEqual = isEqual &&
dsfi1.derivationImages.length === dsfi2.derivationImages.length;
for (let i = 0; i < dsfi1.derivationImages.length; ++i) {
const derivationImage1 = dsfi1.derivationImages[i];
const derivationImage2 = dsfi2.derivationImages[i];
isEqual = isEqual &&
derivationImage1.sourceImages.length ===
derivationImage2.sourceImages.length;
for (let j = 0; j < derivationImage1.length; ++j) {
const sourceImage1 = derivationImage1.sourceImages[j];
const sourceImage2 = derivationImage2.sourceImages[j];
isEqual = isEqual &&
sourceImage1.referencedSOPClassUID ===
sourceImage2.referencedSOPClassUID &&
sourceImage1.referencedSOPInstanceUID ===
sourceImage2.referencedSOPInstanceUID;
}
}
return isEqual;
}
/**
* Get a dicom item from a frame information object.
*
* @param {object} frameInfo The frame information object.
* @returns {Object<string, any>} The item as a list of (key, value) pairs.
*/
export function getDicomSegmentFrameInfoItem(frameInfo) {
const item = {
FrameContentSequence: {
value: [
{
DimensionIndexValues: frameInfo.dimIndex
}
]
},
PlanePositionSequence: {
value: [
{
ImagePositionPatient: frameInfo.imagePosPat
}
]
},
SegmentIdentificationSequence: {
value: [
{
ReferencedSegmentNumber: frameInfo.refSegmentNumber
}
]
}
};
// optional DerivationImageSequence
if (frameInfo.derivationImages !== undefined) {
const sourceImgPurposeOfReferenceCode = {
CodeMeaning: 'Source image for image processing operation',
CodeValue: 121_322,
CodingSchemeDesignator: 'DCM'
};
const segDerivationCode = {
CodeMeaning: 'Segmentation',
CodeValue: 113_076,
CodingSchemeDesignator: 'DCM'
};
const derivationImageItems = [];
for (const derivationImage of frameInfo.derivationImages) {
const sourceImages = [];
for (const sourceImage of derivationImage.sourceImages) {
sourceImages.push({
PurposeOfReferenceCodeSequence: {
value: [sourceImgPurposeOfReferenceCode]
},
ReferencedSOPClassUID: sourceImage.referencedSOPClassUID,
ReferencedSOPInstanceUID: sourceImage.referencedSOPInstanceUID
});
}
derivationImageItems.push({
DerivationCodeSequence: {
value: [segDerivationCode]
},
SourceImageSequence: {
value: sourceImages
}
});
}
item.DerivationImageSequence = {
value: derivationImageItems
};
}
return item;
}