Magnetic Resonance Imaging (MRI) Practice Test

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In a contrast enhanced MR angiography of the abdominal arteries, the IV gad would enhance in which order?

Renal, SMA, IMA, Celiac
Celiac, SMA, Renal, IMA
IMA, Celiac, SMA, Renal
SMA, Renal, IMA, Celiac

The correct answer is: Celiac, SMA, Renal, IMA

In contrast-enhanced MR angiography, the order in which the intravenous gadolinium (gad) contrast material enhances the abdominal arteries is primarily influenced by the anatomy and blood flow dynamics of the vascular system. The celiac trunk arises first from the abdominal aorta, and it branches into the left gastric, splenic, and common hepatic arteries, supplying the upper abdominal organs. The superior mesenteric artery (SMA) follows, branching off next and supplying the small intestine and part of the large intestine. Renal arteries branch off after the SMA, supplying the kidneys, which are located further downstream in the aorta's branches. The inferior mesenteric artery (IMA) branches last, supplying the remaining part of the large intestine. Due to this anatomical branching sequence, the enhancement typically follows the order of the celiac trunk first, followed by the SMA, then the renal arteries, and finally, the IMA. This is why the correct answer indicates that the enhancement occurs in the order of celiac, SMA, renal, and IMA.