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How to tell for a CTA extremity exam if arteries are occluded or if scan time exceeded the contrast?

CTA bilateral runoff and no contrast was visible in right distal calf to toes, left leg was positioned higher up due to patients condition so could not compare that way… is there indications that can tell you if it is an occlusion or if you need to repeat the exam? Thank you so much!

submitted by /u/Paleontologist-Sea18
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source https://www.reddit.com/r/Radiology/comments/tq4ey2/how_to_tell_for_a_cta_extremity_exam_if_arteries/

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