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Simultaneous multi‐slice combined with PROPELLER
Author(s) -
Norbeck Ola,
Avventi Enrico,
Engström Mathias,
Rydén Henric,
Skare Stefan
Publication year - 2018
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.27041
Subject(s) - propeller , computer science , artifact (error) , calibration , acceleration , image quality , signal (programming language) , computer vision , parallel , artificial intelligence , physics , image (mathematics) , mathematics , engineering , geometry , classical mechanics , quantum mechanics , marine engineering , programming language
Purpose Simultaneous multi‐slice (SMS) imaging is an advantageous method for accelerating MRI scans, allowing reduced scan time, increased slice coverage, or high temporal resolution with limited image quality penalties. In this work we combine the advantages of SMS acceleration with the motion correction and artifact reduction capabilities of the PROPELLER technique. Methods A PROPELLER sequence was developed with support for CAIPIRINHA and phase optimized multiband radio frequency pulses. To minimize the time spent on acquiring calibration data, both in‐plane‐generalized autocalibrating partial parallel acquisition (GRAPPA) and slice‐GRAPPA weights for all PROPELLER blade angles were calibrated on a single fully sampled PROPELLER blade volume. Therefore, the proposed acquisition included a single fully sampled blade volume, with the remaining blades accelerated in both the phase and slice encoding directions without additional auto calibrating signal lines. Comparison to 3D RARE was performed as well as demonstration of 3D motion correction performance on the SMS PROPELLER data. Results We show that PROPELLER acquisitions can be efficiently accelerated with SMS using a short embedded calibration. The potential in combining these two techniques was demonstrated with a high quality 1.0 × 1.0 × 1.0 mm 3 resolution T 2 ‐weighted volume, free from banding artifacts, and capable of 3D retrospective motion correction, with higher effective resolution compared to 3D RARE. Conclusion With the combination of SMS acceleration and PROPELLER imaging, thin‐sliced reformattable T 2 ‐weighted image volumes with 3D retrospective motion correction capabilities can be rapidly acquired with low sensitivity to flow and head motion. Magn Reson Med 80:496–506, 2018. © 2017 International Society for Magnetic Resonance in Medicine.