Profile order and time-dependent artifacts in contrast-enhanced coronary MR angiography at 3T: origin and prevention.

Détails

ID Serval
serval:BIB_65B08DE9EA19
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Profile order and time-dependent artifacts in contrast-enhanced coronary MR angiography at 3T: origin and prevention.
Périodique
Magnetic Resonance In Medicine
Auteur(s)
Kotys M.S., Herzka D.A., Vonken E.J., Ohayon J., Heroux J., Gharib A.M., Stuber M., Pettigrew R.I.
ISSN
1522-2594[electronic], 0740-3194[linking]
Statut éditorial
Publié
Date de publication
2009
Volume
62
Numéro
2
Pages
292-299
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
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.
Mots-clé
Algorithms, Artifacts, Contrast Media, Coronary Angiography/methods, Coronary Vessels/anatomy & histology, Humans, Image Enhancement/methods, Image Interpretation, Computer-Assisted/methods, Magnetic Resonance Angiography/methods, Meglumine/analogs & derivatives, Meglumine/diagnostic use, Organometallic Compounds/diagnostic use
Pubmed
Web of science
Création de la notice
02/03/2010 16:04
Dernière modification de la notice
20/08/2019 14:21
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