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What is the difference between catheter venography and MRV/CTV?

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While looking up the ACR appropriateness criteria for upper extremity dvt ( https://acsearch.acr.org/docs/69417/Narrative/) I noticed that different procedures included u/S, CTV, MRV and then catheter venography? Reading the description for catheter venography "It involves the injection of an
iodinated contrast agent .....The contrast agent flows in the veins, opacifying them, and thrombus can be identified as a filling defect in a vein...." Isn't that what an MRV or CT Venography does as well?? I guess I don't understand how just by injecting contrast into a vein you are able to visualize a thrombus. Don't you need some imaging medium to use with the contrast?

submitted by /u/naran_j
[link] [comments]

source https://www.reddit.com/r/Radiology/comments/pngkx6/what_is_the_difference_between_catheter/
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