Which of the following is/are more commercially successful image enhancement method in mask mode radiography, an area under medical imaging?

Which of the following is/are more commercially successful image enhancement method in mask mode radiography, an area under medical imaging? Correct Answer Subtraction

In the given area of medical imaging, a mask of an X-ray image of a region of subject is captured using TV camera is subtracted from image of same region taken after injecting a contrast medium to the bloodstream. The subtraction result gives an enhanced detail of how a contrast medium propagates through the bloodstream. This the best commercially successful method.
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