How to use the cornerstone-core.getPixels function in cornerstone-core

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  const yRadius = Math.sqrt(
    square(handles.perpendicularPoint.x - center.x) +
      square(handles.perpendicularPoint.y - center.y),
  )
  const theta = Math.atan2(
    handles.end.y - handles.start.y,
    handles.end.x - handles.start.x,
  )

  ellipseCoordinates.xRadius = xRadius
  ellipseCoordinates.yRadius = yRadius
  ellipseCoordinates.center = center

  // Retrieve the array of pixels that the ellipse bounds cover
  const pixels = cornerstone.getPixels(
    element,
    ellipseCoordinates.left,
    ellipseCoordinates.top,
    ellipseCoordinates.width,
    ellipseCoordinates.height,
  )

  // Calculate the mean & standard deviation from the pixels and the ellipse details.
  const ellipseMeanStdDev = calculateRotatedEllipseStatistics(
    pixels,
    ellipseCoordinates,
    theta,
  )

  let meanStdDevSUV