Three‐dimensional heart locator and compressed sensing for whole‐heart MR angiography. Issue 5 (10th June 2015)

• Record Type: Journal Article
• Authors: Moghari, Mehdi H.; Annese, David; Geva, Tal; Powell, Andrew J.
• Is Part Of: Magnetic resonance in medicine. Volume 75:Issue 5(2016)
• Page Start: 2086
• Page End: 2093
• Publication Date: 2015-06-10
• Subjects: whole‐heart angiography -- respiratory motion -- navigator -- motion compensation -- compressed sensing; Nuclear magnetic resonance -- Periodicals; Electron paramagnetic resonance -- Periodicals; 616.07548
• DOI: 10.1002/mrm.25800
• Languages: English
• ISSNs: 0740-3194

Abstract

Abstract : Purpose: We sought to develop a whole‐heart magnetic resonance angiography technique with three‐dimensional (3D) respiratory motion compensation and reduced scan time. Methods: A novel respiratory motion compensation method was implemented that acquires a 1D navigator (NAV) and a low‐resolution 3D‐image of the heart (3D‐LOC) just before the angiography data. The central 10% of SSFP k‐space was fully acquired using NAV‐gating, and then 10% of peripheral k‐space was randomly undersampled to complete the scan. Spatial registration of the 3D‐LOC information was used to correct the central and peripheral k‐space lines for the bulk respiratory motion in three dimensions, and then the remaining k‐space data was estimated using compressed sensing (CS). Ten volunteers each underwent two angiography acquisitions with 1 mm 3 resolution: (i) conventional NAV with CS, and (ii) the new 3D‐LOC with CS. Results: Compared with conventional NAV, the new 3D‐LOC with CS technique had a shorter scan time (4.8 ± 1.1 versus 6.3 ± 1.7 min; P < 0.001), better objective vessel sharpness for all three coronary arteries ( P < 0.05), and no difference in subjective vessel sharpness for all three coronary arteries. Conclusion: Compared with conventional NAV with CS, acceleration and respiratory motion correction using 3D‐LOC with CS reduces scan time and improves objective vessel sharpness. Magn Reson Med 75:2086–2093, 2016. © 2015 Wiley Periodicals, Inc.