Gets the Hounsfield's unit (HU) equivalent to the pixel value specified by x** and y**.
frame
The frame that contains the information of the image data**.
x
The x-axis coordinate of the pixel.
y
The y-axis coordinate of the pixel.
data
The image data pixel value, pass -1 to retrieve the data from info.
Character string that represents the Hounsfield's unit (HU) equivalent to the pixel value specified by x and y.
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