We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Interleaved, undersampled radial multiple‐acquisition steady‐state free precession for improved left atrial cine imaging.
- Authors
Robb, Jaime S.; Hu, Chenxi; Peters, Dana C.
- Abstract
Purpose: Balanced steady‐state free precession (bSSFP) left atrial (LA) cine suffers from off‐resonance artifacts, particularly in the pulmonary veins (PVs). Linear combination or multiple‐acquisition SSFP (MA‐SSFP) effectively removes banding but greatly increases scan time. We hypothesized that MA‐SSFP with interleaved radial undersampling, where each phase‐cycling is acquired with an interleaved set of radial projections, would improve image quality of LA cine with a small increase of scan time and streak artefacts. Methods: Undersampled radial MA‐SSFP with and without interleaving was compared with fully sampled radial bSSFP by means of simulations, phantoms, and in vivo imaging. Ten healthy subjects were imaged on a 3T scanner, with bSSFP and MA‐SSFP cine of the left atrium, and B0‐mapping. Images were assessed (1 = worst, 5 = best) by 2 independent readers, with respect to 5 qualitative criteria and apparent signal‐to‐noise ratio. Results: In healthy subjects, off‐resonance differed from the right inferior PVs to the LA cavity by 163 Hz ± 73 Hz at 3T. Compared with fully sampled radial bSSFP, interleaved radial MA‐SSFP significantly improved image quality with respect to off‐resonance artifacts (3.8 ± 0.6 versus 2.3 ± 1.0; P = 0.005), PV conspicuity (2.8 ± 1.0 versus 4.3 ± 0.5; P = 0.005), and the number of visualized PVs (1.7 ± 0.4 versus 0.9 ± 0.7; P = 0.008), although with greater streak artifacts (3.4 ± 0.4 versus 4.9 ± 0.2; P = 0.004) and lower measured apparent signal‐to‐noise ratio (24 ± 9 versus 69 ± 36; P = 0.002). Flow artifacts were similar. Interleaved radial MA‐SSFP reduced streaking artifacts and increased apparent signal‐to‐noise ratio versus noninterleaved radial. Conclusions: Interleaved radial MA‐SSFP cine reduces banding artifacts with an acceptable increase of scan time and streak artifacts. The proposed technique improves the LA and PV visualization in bSSFP cine imaging.
- Subjects
PULMONARY veins; OPTICAL scanners; SIGNAL-to-noise ratio
- Publication
Magnetic Resonance in Medicine, 2020, Vol 83, Issue 5, p1721
- ISSN
0740-3194
- Publication type
Article
- DOI
10.1002/mrm.28036