When a patient cannot fully extend his or her leg for a knee image, resulting in the knee being 4

When a patient cannot fully extend his or her leg for a knee image, resulting in the knee being 4 inches away from the image receptor, what is the MF if the SID is 40 inches?
A) 0.1.
B) 0.9.
C) 1.11.
D) 10.

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