137 lines
5.1 KiB
Plaintext
137 lines
5.1 KiB
Plaintext
// See https://github.com/OHIF/Viewers/blob/94a9067fe3d291d30e25a1bda5913511388edea2/platform/core/src/utils/metadataProvider/getPixelSpacingInformation.js
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export default function getPixelSpacingInformation(instance) {
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// See http://gdcm.sourceforge.net/wiki/index.php/Imager_Pixel_Spacing
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// TODO: Add Ultrasound region spacing
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// TODO: Add manual calibration
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// TODO: Use ENUMS from dcmjs
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const projectionRadiographSOPClassUIDs = [
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'1.2.840.10008.5.1.4.1.1.1', // CR Image Storage
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'1.2.840.10008.5.1.4.1.1.1.1', // Digital X-Ray Image Storage – for Presentation
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'1.2.840.10008.5.1.4.1.1.1.1.1', // Digital X-Ray Image Storage – for Processing
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'1.2.840.10008.5.1.4.1.1.1.2', // Digital Mammography X-Ray Image Storage – for Presentation
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'1.2.840.10008.5.1.4.1.1.1.2.1', // Digital Mammography X-Ray Image Storage – for Processing
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'1.2.840.10008.5.1.4.1.1.1.3', // Digital Intra – oral X-Ray Image Storage – for Presentation
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'1.2.840.10008.5.1.4.1.1.1.3.1', // Digital Intra – oral X-Ray Image Storage – for Processing
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'1.2.840.10008.5.1.4.1.1.12.1', // X-Ray Angiographic Image Storage
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'1.2.840.10008.5.1.4.1.1.12.1.1', // Enhanced XA Image Storage
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'1.2.840.10008.5.1.4.1.1.12.2', // X-Ray Radiofluoroscopic Image Storage
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'1.2.840.10008.5.1.4.1.1.12.2.1', // Enhanced XRF Image Storage
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'1.2.840.10008.5.1.4.1.1.12.3' // X-Ray Angiographic Bi-plane Image Storage Retired
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]
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const {
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PixelSpacing,
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ImagerPixelSpacing,
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SOPClassUID,
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PixelSpacingCalibrationType,
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PixelSpacingCalibrationDescription,
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EstimatedRadiographicMagnificationFactor,
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SequenceOfUltrasoundRegions
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} = instance
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const isProjection = projectionRadiographSOPClassUIDs.includes(SOPClassUID)
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const TYPES = {
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NOT_APPLICABLE: 'NOT_APPLICABLE',
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UNKNOWN: 'UNKNOWN',
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CALIBRATED: 'CALIBRATED',
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DETECTOR: 'DETECTOR'
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}
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if (!isProjection) {
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return PixelSpacing
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}
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if (isProjection && !ImagerPixelSpacing) {
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// If only Pixel Spacing is present, and this is a projection radiograph,
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// PixelSpacing should be used, but the user should be informed that
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// what it means is unknown
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return {
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PixelSpacing,
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type: TYPES.UNKNOWN,
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isProjection
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}
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} else if (
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PixelSpacing &&
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ImagerPixelSpacing &&
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PixelSpacing === ImagerPixelSpacing
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) {
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// If Imager Pixel Spacing and Pixel Spacing are present and they have the same values,
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// then the user should be informed that the measurements are at the detector plane
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return {
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PixelSpacing,
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type: TYPES.DETECTOR,
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isProjection
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}
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} else if (
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PixelSpacing &&
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ImagerPixelSpacing &&
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PixelSpacing !== ImagerPixelSpacing
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) {
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// If Imager Pixel Spacing and Pixel Spacing are present and they have different values,
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// then the user should be informed that these are "calibrated"
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// (in some unknown manner if Pixel Spacing Calibration Type and/or
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// Pixel Spacing Calibration Description are absent)
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return {
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PixelSpacing,
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type: TYPES.CALIBRATED,
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isProjection,
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PixelSpacingCalibrationType,
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PixelSpacingCalibrationDescription
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}
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} else if (!PixelSpacing && ImagerPixelSpacing) {
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let CorrectedImagerPixelSpacing = ImagerPixelSpacing
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if (EstimatedRadiographicMagnificationFactor) {
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// Note that in IHE Mammo profile compliant displays, the value of Imager Pixel Spacing is required to be corrected by
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// Estimated Radiographic Magnification Factor and the user informed of that.
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// TODO: should this correction be done before all of this logic?
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CorrectedImagerPixelSpacing = ImagerPixelSpacing.map(
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(pixelSpacing) =>
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pixelSpacing / EstimatedRadiographicMagnificationFactor
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)
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} else {
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console.warn(
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'EstimatedRadiographicMagnificationFactor was not present. Unable to correct ImagerPixelSpacing.'
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)
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}
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return {
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PixelSpacing: CorrectedImagerPixelSpacing,
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isProjection
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}
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} else if (
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SequenceOfUltrasoundRegions &&
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typeof SequenceOfUltrasoundRegions === 'object'
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) {
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const { PhysicalDeltaX, PhysicalDeltaY } = SequenceOfUltrasoundRegions
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const USPixelSpacing = [PhysicalDeltaX * 10, PhysicalDeltaY * 10]
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return {
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PixelSpacing: USPixelSpacing
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}
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} else if (
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SequenceOfUltrasoundRegions &&
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Array.isArray(SequenceOfUltrasoundRegions) &&
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SequenceOfUltrasoundRegions.length > 1
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) {
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console.warn(
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'Sequence of Ultrasound Regions > one entry. This is not yet implemented, all measurements will be shown in pixels.'
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)
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} else if (isProjection === false && !ImagerPixelSpacing) {
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// If only Pixel Spacing is present, and this is not a projection radiograph,
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// we can stop here
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return {
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PixelSpacing,
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type: TYPES.NOT_APPLICABLE,
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isProjection
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}
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}
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console.warn(
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'Unknown combination of PixelSpacing and ImagerPixelSpacing identified. Unable to determine spacing.'
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)
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}
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