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const { CalibrationTypes } = Enums;
const PIXEL_UNITS = 'px';
const VOXEL_UNITS = 'voxels';
/**
* DICOM Region Data Types as defined in the DICOM standard
* https://dicom.nema.org/medical/dicom/current/output/chtml/part03/sect_C.8.5.5.html#sect_C.8.5.5.1.2
*/
const SUPPORTED_REGION_DATA_TYPES = [
1, // Tissue
2, // Color Flow
3, // PW Spectral Doppler
4, // CW Spectral Doppler
];
const SUPPORTED_LENGTH_VARIANT = [
'3,3', // x: cm & y:cm
'4,7', // x: seconds & y : cm/sec
];
const SUPPORTED_PROBE_VARIANT = [
'4,3', // x: seconds & y : cm
'4,7', // x: seconds & y : cm/sec
];
/**
* DICOM Pixel Physical Units as defined in the DICOM standard
* https://dicom.nema.org/medical/dicom/current/output/chtml/part03/sect_C.8.5.5.html#sect_C.8.5.5.1.6
*/
const UNIT_MAPPING = {
0: 'px',
1: 'percent',
2: 'dB',
3: 'cm',
4: 'seconds',
5: 'hertz',
6: 'dB/seconds',
7: 'cm/sec',
8: 'cm\xb2',
9: 'cm\xb2/s',
0xc: 'degrees',
};
const EPS = 1e-3;
const SQUARE = '\xb2';
/**
* Extracts the calibrated length units, area units, and the scale
* for converting from internal spacing to image spacing.
*
* @param handles - to detect if spacing information is different between points
* @param image - to extract the calibration from
* @returns Object containing the units, area units, and scale
*/
const getCalibratedLengthUnitsAndScale = (image, handles) => {
const { calibration, hasPixelSpacing } = image;
let unit = hasPixelSpacing ? 'mm' : PIXEL_UNITS;
const volumeUnit = hasPixelSpacing ? 'mm\xb3' : VOXEL_UNITS;
let areaUnit = unit + SQUARE;
let scale = 1;
let calibrationType = '';
Eif (
!calibration ||
(!calibration.type && !calibration.sequenceOfUltrasoundRegions)
) {
return { unit, areaUnit, scale, volumeUnit };
}
if (calibration.type === CalibrationTypes.UNCALIBRATED) {
return {
unit: PIXEL_UNITS,
areaUnit: PIXEL_UNITS + SQUARE,
scale,
volumeUnit: VOXEL_UNITS,
};
}
if (calibration.sequenceOfUltrasoundRegions) {
let imageIndex1, imageIndex2;
if (Array.isArray(handles) && handles.length === 2) {
[imageIndex1, imageIndex2] = handles;
} else if (typeof handles === 'function') {
const points = handles();
imageIndex1 = points[0];
imageIndex2 = points[1];
}
let regions = calibration.sequenceOfUltrasoundRegions.filter(
(region) =>
imageIndex1[0] >= region.regionLocationMinX0 &&
imageIndex1[0] <= region.regionLocationMaxX1 &&
imageIndex1[1] >= region.regionLocationMinY0 &&
imageIndex1[1] <= region.regionLocationMaxY1 &&
imageIndex2[0] >= region.regionLocationMinX0 &&
imageIndex2[0] <= region.regionLocationMaxX1 &&
imageIndex2[1] >= region.regionLocationMinY0 &&
imageIndex2[1] <= region.regionLocationMaxY1
);
// If we are not in a region at all we should show the underlying calibration
// which might be the mm spacing for the image
if (!regions?.length) {
return { unit, areaUnit, scale, volumeUnit };
}
// if we are in a region then it is the question of whether we support it
// or not. If we do not support it we should show px
regions = regions.filter(
(region) =>
SUPPORTED_REGION_DATA_TYPES.includes(region.regionDataType) &&
SUPPORTED_LENGTH_VARIANT.includes(
`${region.physicalUnitsXDirection},${region.physicalUnitsYDirection}`
)
);
if (!regions.length) {
return {
unit: PIXEL_UNITS,
areaUnit: PIXEL_UNITS + SQUARE,
scale,
volumeUnit: VOXEL_UNITS,
};
}
// Todo: expand on this logic
const region = regions[0];
const physicalDeltaX = Math.abs(region.physicalDeltaX);
const physicalDeltaY = Math.abs(region.physicalDeltaY);
// if we are in a supported region then we should check if the
// physicalDeltaX and physicalDeltaY are the same. If they are not
// then we should show px again, but if they are the same then we should
// show the units
const isSamePhysicalDelta = utilities.isEqual(
physicalDeltaX,
physicalDeltaY,
EPS
);
if (isSamePhysicalDelta) {
// 1 to 1 aspect ratio, we use just one of them
scale = 1 / physicalDeltaX;
calibrationType = 'US Region';
unit = UNIT_MAPPING[region.physicalUnitsXDirection] || 'unknown';
areaUnit = unit + SQUARE;
} else {
// here we are showing at the aspect ratio of the physical delta
// if they are not the same, then we should show px, but the correct solution
// is to grab each point separately and scale them individually
// Todo: implement this
return {
unit: PIXEL_UNITS,
areaUnit: PIXEL_UNITS + SQUARE,
scale,
volumeUnit: VOXEL_UNITS,
};
}
} else if (calibration.scale) {
scale = calibration.scale;
}
// everything except REGION/Uncalibrated
const types = [
CalibrationTypes.ERMF,
CalibrationTypes.USER,
CalibrationTypes.ERROR,
CalibrationTypes.PROJECTION,
CalibrationTypes.CALIBRATED,
CalibrationTypes.UNKNOWN,
];
if (types.includes(calibration?.type)) {
calibrationType = calibration.type;
}
return {
unit: unit + (calibrationType ? ` ${calibrationType}` : ''),
areaUnit: areaUnit + (calibrationType ? ` ${calibrationType}` : ''),
scale,
volumeUnit: volumeUnit + (calibrationType ? ` ${calibrationType}` : ''),
};
};
const getCalibratedProbeUnitsAndValue = (image, handles) => {
const [imageIndex] = handles;
const { calibration } = image;
let units = ['raw'];
let values = [null];
let calibrationType = '';
if (
!calibration ||
(!calibration.type && !calibration.sequenceOfUltrasoundRegions)
) {
return { units, values };
// Todo: add support for other scenarios
}
if (calibration.sequenceOfUltrasoundRegions) {
// for Probe tool
const supportedRegionsMetadata =
calibration.sequenceOfUltrasoundRegions.filter(
(region) =>
SUPPORTED_REGION_DATA_TYPES.includes(region.regionDataType) &&
SUPPORTED_PROBE_VARIANT.includes(
`${region.physicalUnitsXDirection},${region.physicalUnitsYDirection}`
)
);
if (!supportedRegionsMetadata?.length) {
return { units, values };
}
const region = supportedRegionsMetadata.find(
(region) =>
imageIndex[0] >= region.regionLocationMinX0 &&
imageIndex[0] <= region.regionLocationMaxX1 &&
imageIndex[1] >= region.regionLocationMinY0 &&
imageIndex[1] <= region.regionLocationMaxY1
);
if (!region) {
return { units, values };
}
// Todo: I think this is a ok assumption for now that if the referencePixelX0 and referencePixelY0
// are not defined, then we can assume 0 for them
const { referencePixelX0 = 0, referencePixelY0 = 0 } = region;
const { physicalDeltaX, physicalDeltaY } = region;
const yValue =
(imageIndex[1] - region.regionLocationMinY0 - referencePixelY0) *
physicalDeltaY;
const xValue =
(imageIndex[0] - region.regionLocationMinX0 - referencePixelX0) *
physicalDeltaX;
calibrationType = 'US Region';
values = [xValue, yValue];
units = [
UNIT_MAPPING[region.physicalUnitsXDirection],
UNIT_MAPPING[region.physicalUnitsYDirection],
];
}
return {
units,
values,
calibrationType,
};
};
/** Gets the aspect ratio of the screen display relative to the image
* display in order to square up measurement values.
* That is, suppose the spacing on the image is 1, 0.5 (x,y spacing)
* This is displayed at 1, 1 spacing on screen, then the
* aspect value will be 1/0.5 = 2
*/
const getCalibratedAspect = (image) => image.calibration?.aspect || 1;
export {
getCalibratedLengthUnitsAndScale,
getCalibratedAspect,
getCalibratedProbeUnitsAndValue,
};
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