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New acceleration techniques will :
reduce scan times 
cause artifacts 
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be useful if you have a lot of experience 
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MRI Forum: Contrast MRA COW.
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  Category:  Contrast Agents
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Marilia White

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Thu. 3 Mar.05,
16:40
Contrast MRA COW.
Just started a new job and the tech there insists on injecting with a butterfly then coming out and running a 3D MRA of the Head. Has anyone ever heard of this? I have done carotids but not Circle of willis. If there is such a thing please let me know your Protocol. I am open to any suggestions on the Carotids to. She injects them with a butterfly as well and what a mess. Help I just got back on GE echospeed after 5 yrs and no manual. Just a crazy tech. Please help.

azoreangal

Sue Johanson

Wed. 27 Apr.05,
03:36
Hi,
seems crazy, you should have many undesirable veins! We run a 3D TOF MRA of the circle of willis without contrast with best results (1.5T and 3T).
Contrast enhanced 3D MRA of the carotids are done with machine injection (never with a butterfly!), automated bolus detection and a flow of 3ml/sec and 25 ml Gad. If no bolus detection program is available, look for the delay with a test bolus of 2ml. With a high resolution scan, both carotids and circle of willis are assessable. The use of a set like Smartset for the injection is helpful if no power injector is available.

RAWLE CONLIFFE

Thu. 12 Jan.06,
08:59
ITS REALLY NOT NECESSARY TO ROUTINELY DO CE MRA OF THE "COW". BY UTILIZING A 3D SPOILED FAST GRE THEN MANUALLY RECONSTRUCTING THE MIP THE ARTERIES ARE SUFFICIENTLY ENHANCED.

German Villegas

Tue. 14 Oct.08,
22:11
Just came from an MRI convention by Bill Faulkner according to him CE MRA COW is a very Diagnostic exam, no undesireble veins! I thought the same but it appears this exam has proven to be valuable in the diagnosis of oclusions, stenosis and aneurysms. I do not have a protocol, but am working to build one. I will post suggestions once I got something that works. Bill did mention it must be a dynamic scan quick enough to show arterial flow and then venous, so no more than 10 seconds per scan. Very few centers and hospitals offer this protocol but its in the works.

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