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Single‐shot RARE with Dixon: Application to robust abdominal imaging with uniform fat and water separation at 3T
Author(s) -
Wang Xinzeng,
Udayakumar Durga,
Xi Yin,
Rofsky Neil M.,
Pedrosa Ivan,
Madhuranthakam Ananth J.
Publication year - 2021
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.28816
Subject(s) - nuclear magnetic resonance , nuclear medicine , medicine , physics
Purpose To develop a true single shot turbo spin echo (SShTSE) acquisition with Dixon for robust T 2 ‐weighted abdominal imaging with uniform fat and water separation at 3T. Methods The in‐phase (IP) and out‐of‐phase (OP) echoes for Dixon processing were acquired in the same repetition time of a SShTSE using partial echoes. A phase‐preserved bi‐directional homodyne reconstruction was developed to compensate the partial echo and the partial phase encoding of SShTSE. With IRB approval, the SShTSE‐Dixon was compared against standard SShTSE, without and with fat suppression using spectral adiabatic inversion recovery (SPAIR) in 5 healthy volunteers and 5 patients. The SNR and contrast ratio (CR) of spleen to liver were compared among different acquisitions. Results The bi‐directional homodyne reconstruction successfully minimized ringing artifacts because of partial acquisitions. SShTSE‐Dixon achieved uniform fat suppression compared to SShTSE‐SPAIR with fat suppression failures of 1/10 versus 10/10 in the axial plane and 0/5 versus 5/5 in the coronal plane, respectively. The SNRs of the liver (12.2 ± 4.9 vs. 11.7 ± 5.2; P = .76) and spleen (25.9 ± 11.6 vs. 23.7 ± 9.7; P = .14) were equivalent between fat‐suppressed images (SShTSE‐Dixon water‐only and SShTSE‐SPAIR). The SNRs of liver (14.4 ± 5.7 vs. 13.4 ± 5.0; P = .60) and spleen (26.5 ± 10.1 vs. 25.7 ± 8.5; P = .56) were equivalent between non‐fat‐suppressed images (SShTSE‐Dixon IP and SShTSE). The CRs of spleen to liver were also similar between fat‐suppressed images (2.6 ± 0.4 vs. 2.5 ± 0.5; P =.92) and non‐fat‐suppressed images (2.3 ± 0.6 vs. 2.2 ± 0.4; P =.84). Conclusion SShTSE‐Dixon generates robust abdominal T 2 ‐weighted images at 3T with and without uniform fat suppression, along with perfectly co‐registered fat‐only images in a single acquisition.