TrizTech/ohif-viewer
18
0 Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

fix: x-ray pixel spacing calibration (#4922)

Browse Source
This commit is contained in:
Pedro Köhler authored and GitHub committed 2025-04-09 09:55:51 -04:00
1 parent 0d2ccc5830
commit f6f60a63d2
14 files changed
+203 -300
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

platform/core/src/utils/metadataProvider/getPixelSpacingInformation.js
-105
View File
@@ -1,105 +0,0 @@
import log from '../../log';
export default function getPixelSpacingInformation(instance) {
// See http://gdcm.sourceforge.net/wiki/index.php/Imager_Pixel_Spacing
// TODO: Add manual calibration
// TODO: Use ENUMS from dcmjs
const projectionRadiographSOPClassUIDs = [
'1.2.840.10008.5.1.4.1.1.1', // CR Image Storage
'1.2.840.10008.5.1.4.1.1.1.1', // Digital X-Ray Image Storage – for Presentation
'1.2.840.10008.5.1.4.1.1.1.1.1', // Digital X-Ray Image Storage – for Processing
'1.2.840.10008.5.1.4.1.1.1.2', // Digital Mammography X-Ray Image Storage – for Presentation
'1.2.840.10008.5.1.4.1.1.1.2.1', // Digital Mammography X-Ray Image Storage – for Processing
'1.2.840.10008.5.1.4.1.1.1.3', // Digital Intra – oral X-Ray Image Storage – for Presentation
'1.2.840.10008.5.1.4.1.1.1.3.1', // Digital Intra – oral X-Ray Image Storage – for Processing
'1.2.840.10008.5.1.4.1.1.12.1', // X-Ray Angiographic Image Storage
'1.2.840.10008.5.1.4.1.1.12.1.1', // Enhanced XA Image Storage
'1.2.840.10008.5.1.4.1.1.12.2', // X-Ray Radiofluoroscopic Image Storage
'1.2.840.10008.5.1.4.1.1.12.2.1', // Enhanced XRF Image Storage
'1.2.840.10008.5.1.4.1.1.12.3', // X-Ray Angiographic Bi-plane Image Storage Retired
];
const {
PixelSpacing,
ImagerPixelSpacing,
SOPClassUID,
PixelSpacingCalibrationType,
PixelSpacingCalibrationDescription,
EstimatedRadiographicMagnificationFactor,
} = instance;
const isProjection = projectionRadiographSOPClassUIDs.includes(SOPClassUID);
const TYPES = {
NOT_APPLICABLE: 'NOT_APPLICABLE',
UNKNOWN: 'UNKNOWN',
CALIBRATED: 'CALIBRATED',
DETECTOR: 'DETECTOR',
};
if (isProjection && !ImagerPixelSpacing) {
// If only Pixel Spacing is present, and this is a projection radiograph,
// PixelSpacing should be used, but the user should be informed that
// what it means is unknown
return {
PixelSpacing,
type: TYPES.UNKNOWN,
isProjection,
};
} else if (PixelSpacing && ImagerPixelSpacing && PixelSpacing === ImagerPixelSpacing) {
// If Imager Pixel Spacing and Pixel Spacing are present and they have the same values,
// then the user should be informed that the measurements are at the detector plane
return {
PixelSpacing,
type: TYPES.DETECTOR,
isProjection,
};
} else if (PixelSpacing && ImagerPixelSpacing && PixelSpacing !== ImagerPixelSpacing) {
// If Imager Pixel Spacing and Pixel Spacing are present and they have different values,
// then the user should be informed that these are "calibrated"
// (in some unknown manner if Pixel Spacing Calibration Type and/or
// Pixel Spacing Calibration Description are absent)
return {
PixelSpacing,
type: TYPES.CALIBRATED,
isProjection,
PixelSpacingCalibrationType,
PixelSpacingCalibrationDescription,
};
} else if (!PixelSpacing && ImagerPixelSpacing) {
let CorrectedImagerPixelSpacing = ImagerPixelSpacing;
if (EstimatedRadiographicMagnificationFactor) {
// Note that in IHE Mammo profile compliant displays, the value of Imager Pixel Spacing is required to be corrected by
// Estimated Radiographic Magnification Factor and the user informed of that.
// TODO: should this correction be done before all of this logic?
CorrectedImagerPixelSpacing = ImagerPixelSpacing.map(
pixelSpacing => pixelSpacing / EstimatedRadiographicMagnificationFactor
);
} else {
if (!instance._loggedSpacingMessage) {
log.info(
'EstimatedRadiographicMagnificationFactor was not present. Unable to correct ImagerPixelSpacing.'
);
instance._loggedSpacingMessage = true;
}
}
return {
PixelSpacing: CorrectedImagerPixelSpacing,
isProjection,
};
} else if (isProjection === false && !ImagerPixelSpacing) {
// If only Pixel Spacing is present, and this is not a projection radiograph,
// we can stop here
return {
PixelSpacing,
type: TYPES.NOT_APPLICABLE,
isProjection,
};
}
log.info(
'Unknown combination of PixelSpacing and ImagerPixelSpacing identified. Unable to determine spacing.'
);
}