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

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

(a) Addition

(b) Subtraction

(c) Multiplication

(d) Division

This question was posed to me in an interview for job.

Origin of the question is Enhancement using Arithmetic Operations in portion Image Enhancement of Digital Image Processing

1 Answer

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Correct option is (b) Subtraction

Easy explanation: 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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