By Martin R. Prince MD, PhD, Thomas M. Grist M.D., Jörg F. Debatin M.D., MBA (auth.)
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Extra resources for 3D Contrast MR Angiography
While the bifurcated Vanguard stent does not obscure the arteriallumen of the infrarenal aorta or the left iliac leg, the Wallstent causes a complete signal void. Covered and non-covered stents which had been evaluated for 3D MRA imaging (b). Several stents cause complete obliteration of the vascular lumen (crossed out) while others permit full assessment of the lumen. , Zurich, Switzerland. How Does 3D Contrast MR Angiography Compare To 3D CTA? In prineiple, 3D eontrast-enhaneed MR angiography is similar to eontrast-enhaneed helieal eomputed tomography angiography (CTA).
Bone, as well as calcium, remain dark. Unlike CTA, no effort is required to segment the image data to eliminate other structures, which might obscure the reconstructed vascular anatomy. With 3D contrast-enhanced MR angiography, vascular projection images can be reconstructed without delay. 4. MR angiography images are acquired without the use of ionizing radiation. This is of great advantage in the assessment of young patients. Since very thin images are required for adequate depiction of the vascular anatomy, the radiation dose associated with CTA is considerable, especially in critical areas such as the neck or the pelvis.
The stented lumen could be assessed sufficiently to exclude the presence of a hemodynamically significant (>50% luminal narrowing) stenosis. Similarly, no artifact was seen with the Vanguard AAA Stents. It thus seems that the luminal patency of selected commercially available plain and covered stents can indeed be assessed with 3D contrast MRA. 17. Intravascular Stents. Three-dimensional MRA of the abdominal aorta (a) containing a covered abdominal aortic aneurysm (AAA), bifurcated AAA stent, as weil as a Wallstent in the right iliac leg.
3D Contrast MR Angiography by Martin R. Prince MD, PhD, Thomas M. Grist M.D., Jörg F. Debatin M.D., MBA (auth.)