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Magn Reson Med. 2013 Nov;70(5):1360-8. doi: 10.1002/mrm.24564. Epub 2012 Dec 4.

Motion and flow insensitive adiabatic T2 -preparation module for cardiac MR imaging at 3 Tesla.

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  • 1Duke Cardiovascular Magnetic Resonance Center, Duke University Medical Center, Durham, North Carolina, USA.

Abstract

A versatile method for generating T2 -weighting is a T2 -preparation module, which has been used successfully for cardiac imaging at 1.5T. Although it has been applied at 3T, higher fields (B0 ≥ 3T) can degrade B0 and B1 homogeneity and result in nonuniform magnetization preparation. For cardiac imaging, blood flow and cardiac motion may further impair magnetization preparation. In this study, a novel T2 -preparation module containing multiple adiabatic B1 -insensitive refocusing pulses is introduced and compared with three previously described modules [(a) composite MLEV4, (b) modified BIR-4 (mBIR-4), and (c) Silver-Hoult-pair]. In the static phantom, the proposed module provided similar or better B0 and B1 insensitivity than the other modules. In human subjects (n = 21), quantitative measurement of image signal coefficient of variation, reflecting overall image inhomogeneity, was lower for the proposed module (0.10) than for MLEV4 (0.15, P < 0.0001), mBIR-4 (0.27, P < 0.0001), and Silver-Hoult-pair (0.14, P = 0.001) modules. Similarly, qualitative analysis revealed that the proposed module had the best image quality scores and ranking (both, P < 0.0001). In conclusion, we present a new T2 -preparation module, which is shown to be robust for cardiac imaging at 3T in comparison with existing methods.

Copyright © 2012 Wiley Periodicals, Inc.

KEYWORDS:

3T; T2-weighting; adiabatic pulses; cardiac imaging

PMID:
23213005
[PubMed - indexed for MEDLINE]
PMCID:
PMC3926429
Free PMC Article
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