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DOI: 10.1055/s-2003-42895
Coronary MR Imaging Using Free-Breathing 3D Steady-State Free Precession with Radial k-space Sampling
MR-Koronarangiographie während freier Atmung mit 3D Steady-State Free Precession und radialer k-Raum AbtastungPublikationsverlauf
Publikationsdatum:
13. Oktober 2003 (online)
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Zusammenfassung
Zielsetzung: Untersuchung einer 3D steady-state free precession (SSFP) MR-Koronarangiographiesequenz während freier Atmung mit radialer k-Raum Abtastung für die MR-Koronarangiographie, Projektions-Angiographie und MR-Koronargefäßwandbildgebung. Material und Methode: Eine navigator-gesteuerte 3D-SSFP-Sequenz (TR = 6,1 ms, TE = 3,0 ms, Flip-Winkel = 120°, Sichtfenster [„field-of-view”] = 360 mm2) mit 384 Radialen wurde für eine MR-Koronarlumen- und Projektions-Angiographie implementiert. Für die Projektionsangiographie erfolgte die Kombination mit einem lokalen Spininversions-Puls in der Aorta ascendens. Die MR-Koronargefäßwandbildgebung wurde mit einer radialen 3D-SSFP-Sequenz (384 Radiale, TR = 5,3 ms, TE = 2,7 ms, Flip-Winkel = 55°, rekonstruierte Ortsauflösung 0,35 × 0,35 × 1,2 mm3) mit Schwarzblut-Kontrast („black-blood”) und lokalem Rückstellpuls („local inversion pulse”) durchgeführt. Sechs gesunde Probanden (jeweils zwei für jede Sequenz) wurden untersucht und die Bewegungsartefakte analysiert. Ergebnisse: In der 3D-SSFP-MR-Koronarangiographie stellte sich das Koronargefäßlumen signalreich dar. In Kombination mit der Projetionstechnik wurde das umgebende Gewebe fast vollständig unterdrückt. In der MR-Koronargefäßwandbildgebung kam die Gefäßwand im Vergleich zum Blut und dem umgebenden Gewebe signalreich zur Darstellung. Es traten keine relevanten Bewegungsartefakte auf. Schlussfolgerung: 3D-SSFP mit radialer k-Raumabtastung kann für die MR-Koronarangiographie, Projektions-Angiographie und MR-Koronargefäßwandbildgebung eingesetzt werden.
Abstract
Purpose: To investigate the potential of free-breathing 3D steady-state free precession (SSFP) imaging with radial k-space sampling for coronary MR-angiography (MRA), coronary projection MR-angiography and coronary vessel wall imaging. Materials and Methods: A navigator-gated free-breathing T2-prepared 3D SSFP sequence (TR = 6.1 ms, TE = 3.0 ms, flip angle = 120°, field-of-view = 360 mm2) with radial k-space sampling (384 radials) was implemented for coronary MRA. For projection coronary MRA, this sequence was combined with a 2D selective aortic spin tagging pulse. Coronary vessel wall imaging was performed using a high-resolution inversion-recovery black-blood 3D radial SSFP sequence (384 radials, TR = 5.3 ms, TE = 2.7 ms, flip angle = 55°, reconstructed resolution 0.35 × 0.35 × 1.2 mm3) and a local re-inversion pulse. Six healthy volunteers (two for each sequence) were investigated. Motion artifact level was assessed by two radiologists. Results: In coronary MRA, the coronary lumen was displayed with a high signal and high contrast to the surrounding lumen. Projection coronary MRA demonstrated selective visualization of the coronary lumen while surrounding tissue was almost completely suppressed. In coronary vessel wall imaging, the vessel wall was displayed with a high signal when compared to the blood pool and the surrounding tissue. No visible motion artifacts were seen. Conclusion: 3D radial SSFP imaging enables coronary MRA, coronary projection MRA and coronary vessel wall imaging with a low motion artifact level.
Key words
Magnetic resonance imaging - coronary vessel - coronary artery disease - motion artifacts - contrast
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Elmar Spuentrup MD
Department of Diagnostic Radiology, University Hospital, Aachen University of Technology
Pauwelsstraße 30
52057 Aachen
Germany
Telefon: +49/241/8088332
Fax: +49/241/8082411
eMail: spuenti@rad.rwth-aachen.de