title: 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.
abstract: 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.
authors.affiliation: Department of Diagnostic Radiology, University Hospital Aachen, University of Technology (RWTH), Germany. katoh@rad.rwth-aachen.de
authors.forename: Marcus
authors.initials: M
authors.lastname: Katoh
authors.forename: Elmar
authors.initials: E
authors.lastname: Spuentrup
authors.forename: Matthias
authors.initials: M
authors.lastname: Stuber
authors.forename: Romhild
authors.initials: R
authors.lastname: Hoogeveen
authors.forename: Rolf W
authors.initials: RW
authors.lastname: Günther
authors.forename: Arno
authors.initials: A
authors.lastname: Buecker
mesh_terms: 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