helpers scaleArray.ts

0% Statements 0/12

0% Branches 0/4

0% Functions 0/1

0% Lines 0/10

Press n or j to go to the next uncovered block, b, p or k for the previous block.


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  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  import type { Types } from '@cornerstonejs/core';
 
/**
 * Given a pixel array, rescale the pixel values using the rescale slope and
 * intercept and if modality is PT it uses the suv values to scale the array
 * @param array - The array to be scaled.
 * @param scalingParameters - The scaling parameters
 * @returns The array is being scaled
 */
export default function scaleArray(
  array: Float32Array | Uint8Array,
  scalingParameters: Types.ScalingParameters
): Float32Array | Uint8Array {
  const arrayLength = array.length;
  const { rescaleSlope, rescaleIntercept, suvbw } = scalingParameters;
 
  if (scalingParameters.modality === 'PT') {
    if (typeof suvbw !== 'number') {
      return array;
    }
 
    for (let i = 0; i < arrayLength; i++) {
      array[i] = suvbw * (array[i] * rescaleSlope + rescaleIntercept);
    }
  } else {
    for (let i = 0; i < arrayLength; i++) {
      array[i] = array[i] * rescaleSlope + rescaleIntercept;
    }
  }
 
  return array;
}