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