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DOI: 10.1148/rg.275075023
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RadioGraphics 2007;27:1433-1444
© RSNA, 2007

EDUCATION EXHIBIT

Abdominal MR Imaging at 3.0 T1

Fatih M. Akisik, MD, Kumaresan Sandrasegaran, MD, Alex M. Aisen, MD, Chen Lin, PhD, and Chandana Lall, MD

1 From the Department of Radiology, Indiana University School of Medicine, 550 N University Blvd, Suite UH 0279, Indianapolis, IN 46202. Presented as an education exhibit at the 2006 RSNA Annual Meeting. Received February 12, 2007; revision requested April 12 and received May 14; accepted May 22. F.M.A. is a consultant with Repligen and the Bracco Group, K.S. received a grant from Koninklijke Philips Electronics, and A.M.A. is a consultant with Repligen and Algotec Systems; all remaining authors have no financial relationships to disclose. Address correspondence to K.S. (e-mail: ksandras{at}iupui.edu).

Magnetic resonance (MR) imaging at 3.0 T offers an improved signal-to-noise ratio compared with that at 1.5 T. However, the physics of high field strength also brings disadvantages, such as increases in the specific absorption rate, in magnetic field inhomogeneity effects, and in susceptibility artifacts. The use of 3.0-T MR imaging for abdominal evaluations, in particular, has lagged behind that for other applications because of the difficulty of imaging a large volume while compensating for respiratory motion. At a minimum, abdominal MR imaging at 3.0 T requires modifications in the pulse sequences used at 1.5 T. Such modifications may include a decrease in the flip angle used for refocusing pulses and an increase in the repetition time for T1-weighted acquisitions. In addition, parallel imaging and other techniques (hyper-echo sequences, transition between pseudo steady states) may be used to maintain a high signal-to-noise ratio while decreasing acquisition time and minimizing the occurrence of artifacts on abdominal MR images.

© RSNA, 2007


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