Towards Routine Clinical Use of Radial Stack-of-Stars 3D Gradient-Echo Sequences for Reducing Motion Sensitivity.
10.13104/jksmrm.2014.18.2.87
- Author:
Kai Tobias BLOCK
1
;
Hersh CHANDARANA
;
Sarah MILLA
;
Mary BRUNO
;
Tom MULHOLLAND
;
Girish FATTERPEKAR
;
Mari HAGIWARA
;
Robert GRIMM
;
Christian GEPPERT
;
Berthold KIEFER
;
Daniel K SODICKSON
Author Information
1. Bernard and Irene Schwartz Center for Biomedical Imaging, New York University School of Medicine, New York, USA. Tobias.Block@nyumc.org
- Publication Type:Review
- Keywords:
Radial sampling;
Abdominal MRI;
Pediatric imaging;
Head and neck imaging;
Motion robustness, vibe
- MeSH:
Artifacts;
Cohort Studies;
Humans;
Respiration
- From:Journal of the Korean Society of Magnetic Resonance in Medicine
2014;18(2):87-106
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: To describe how a robust implementation of a radial 3D gradient-echo sequence with stack-of-stars sampling can be achieved, to review the imaging properties of radial acquisitions, and to share the experience from more than 5000 clinical patient scans. MATERIALS AND METHODS: A radial stack-of-stars sequence was implemented and installed on 9 clinical MR systems operating at 1.5 and 3 Tesla. Protocols were designed for various applications in which motion artifacts frequently pose a problem with conventional Cartesian techniques. Radial scans were added to routine examinations without selection of specific patient cohorts. RESULTS: Radial acquisitions show significantly lower sensitivity to motion and allow examinations during free breathing. Elimination of breath-holding reduces failure rates for non-compliant patients and enables imaging at higher resolution. Residual artifacts appear as streaks, which are easy to identify and rarely obscure diagnostic information. The improved robustness comes at the expense of longer scan durations, the requirement for fat suppression, and the nonexistence of a time-to-center value. Care needs to be taken during the configuration of receive coils. CONCLUSION: Routine clinical use of radial stack-of-stars sequences is feasible with current MR systems and may serve as substitute for conventional fat-suppressed T1-weighted protocols in applications where motion is likely to degrade the image quality.
