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- Title
Profile order and time-dependent artifacts in contrast-enhanced coronary MR angiography at 3T: Origin and prevention.
- Authors
Kotys, Melanie S.; Herzka, Daniel A.; Vonken, Evert-Jan; Ohayon, Jacques; Heroux, Julie; Gharib, Ahmed M.; Stuber, Matthias; Pettigrew, Roderic I.
- Abstract
To enhance the clinical value of coronary magnetic resonance angiography (MRA), high-relaxivity contrast agents have recently been used at 3T. Here we examine a uniform bilateral shadowing artifact observed along the coronary arteries in MRA images collected using such a contrast agent. Simulations were performed to characterize this artifact, including its origin, to determine how best to mitigate this effect, and to optimize a data acquisition/injection scheme. An intraluminal contrast agent concentration model was used to simulate various acquisition strategies with two profile orders for a slow-infusion of a high-relaxivity contrast agent. Filtering effects from temporally variable weighting in k-space are prominent when a centric, radial (CR) profile order is applied during contrast infusion, resulting in decreased signal enhancement and underestimation of vessel width, while both pre- and postinfusion steady-state acquisitions result in overestimation of the vessel width. Acquisition during the brief postinfusion steady-state produces the greatest signal enhancement and minimizes k-space filtering artifacts. Magn Reson Med, 2009. © 2009 Wiley-Liss, Inc.
- Publication
Magnetic Resonance in Medicine, 2009, Vol 62, Issue 2, p292
- ISSN
0740-3194
- Publication type
Article
- DOI
10.1002/mrm.21997