By Martin R. Prince MD, PhD, Thomas M. Grist M.D., Jörg F. Debatin M.D., MBA (auth.)
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The Wallstent had been placed to stablize the right iliac leg for correction of a Vanguard stent deformity. 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.
10. Hand Tubing Set for Intravenous Infusions (Smart Set, Topspins, www. com). A 2 meter length of eoiled tubing has two injeetion sites with eheekflow valves (6) to permit simultaneous attachment of a 60 ml contrast syringe and a 20 or 30 ml saline flush syringe (3). The automatie eheck-flow valve system allows immediate switching from the contrast infusion to saline flush. This avoids having a gap in the middle of the bolus wh ich can degrade image quality. How Do I Optimize A Hand Injection?
However, when multiple stations are examined, it becomes necessary to remove bright signal from contrast accumulation in the background tissues and veins. This can be accomplished by performing a digital subtraction of images acquired immediately before the arrival of the contrast agent from images that are acquired during contrast injection. When using digital subtraction, it is helpful to escalate the dose with each successive injection. This helps to offset the effects of residual gadolinium contrast in the arteries, which can lower arterial signal following subtraction.
3D Contrast MR Angiography by Martin R. Prince MD, PhD, Thomas M. Grist M.D., Jörg F. Debatin M.D., MBA (auth.)