Free-breathing renal magnetic resonance angiography with steady-state free-precession and slab-selective spin inversion combined with radial k-space sampling and water-selective excitation.
The impact of radial k-space sampling and water-selective excitation on a novel navigator-gated cardiac-triggered slab-selective inversion prepared 3D steady-state free-precession (SSFP) renal MR angiography (MRA) sequence was investigated. Renal MRA was performed on a 1.5-T MR system using three inversion prepared SSFP approaches: Cartesian (TR/TE: 5.7/2.8 ms, FA: 85 degrees), radial (TR/TE: 5.5/2.7 ms, FA: 85 degrees) SSFP, and radial SSFP combined with water-selective excitation (TR/TE: 9.9/4.9 ms, FA: 85 degrees). Radial data acquisition lead to significantly reduced motion artifacts (P < 0.05). SNR and CNR were best using Cartesian SSFP (P < 0.05). Vessel sharpness and vessel length were comparable in all sequences. The addition of a water-selective excitation could not improve image quality. In conclusion, radial k-space sampling reduces motion artifacts significantly in slab-selective inversion prepared renal MRA, while SNR and CNR are decreased. The addition of water-selective excitation could not improve the lower CNR in radial scanning.
Katoh
Marcus
M
Department of Diagnostic Radiology, University Hospital Aachen, University of Technology (RWTH), Germany. katoh@rad.rwth-aachen.de
Spuentrup
Elmar
E
Stuber
Matthias
M
Hoogeveen
Romhild
R
Günther
Rolf W
RW
Buecker
Arno
A
D000328:Adult; D016477:Artifacts; D016009:Chi-Square Distribution; D005260:Female; D006801:Humans; D006978:Hypertension, Renovascular / Q000175:diagnosis*; D021621:Imaging, Three-Dimensional; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D012077:Renal Artery; D012119:Respiration; D018709:Statistics, Nonparametric