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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | import type { Types } from '@cornerstonejs/core';
export type ViewportVoiMappingForTool = {
voiRange: { lower: number; upper: number };
VOILUTFunction?: string;
/** Viewport invert flag (e.g. PET AC). Needed so display luma inverse-maps to the right raw end. */
invert?: boolean;
};
type ViewportWithProps = Types.IViewport & {
getProperties?: (volumeId?: string) => {
voiRange?: { lower: number; upper: number };
VOILUTFunction?: string;
invert?: boolean;
} | null;
};
/**
* Reads VOI + LUT function from a volume or stack viewport for intensity mapping.
*/
export function getViewportVoiMappingForVolume(
viewport: Types.IViewport,
volumeId?: string
): ViewportVoiMappingForTool | null {
const getProps = (viewport as ViewportWithProps).getProperties;
if (typeof getProps !== 'function') {
return null;
}
const props = volumeId
? getProps.call(viewport, volumeId)
: getProps.call(viewport);
if (!props?.voiRange) {
return null;
}
const { lower, upper } = props.voiRange;
if (typeof lower !== 'number' || typeof upper !== 'number') {
return null;
}
return {
voiRange: { lower, upper },
VOILUTFunction: props.VOILUTFunction,
invert: props.invert === true,
};
}
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