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Published online before print July 19, 2002, 10.1148/radiol.2243011227
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(Radiology 2002;224:657-663.)
© RSNA, 2002

Musculoskeletal Imaging

Water Excitation as an Alternative to Fat Saturation in MR Imaging: Preliminary Results in Musculoskeletal Imaging1

Olivier Hauger, MD, PhD, Eric Dumont, PhD, Jean-François Chateil, MD, Maryse Moinard, MD and François Diard, MD

1 From the Department of Radiology A, Hôpital Pellegrin, Centre Hospitalier Universitaire de Bordeaux, Place Amélie Raba-Léon, Cedex 33076 Bordeaux Cedex, France (O.H., J.F.C., M.M., F.D.); and Philips Medical Systems, Suresnes, France (E.D.). From the 2000 RSNA scientific assembly. Received July 18, 2001; revision requested September 11; revision received December 11; accepted January 22, 2002. Address correspondence to O.H. (e-mail: olivier.hauger@chu-bordeaux.fr).

PURPOSE: To compare fat suppression methods by using spectrally selective fat saturation and section-selective water excitation in standard magnetic resonance (MR) imaging sequences used in day-to-day musculoskeletal practice.

MATERIALS AND METHODS: Eighty-three patients underwent MR examination with a 1.5-T system. The two methods were compared by using three common sequences: T1-weighted spin-echo (SE) imaging performed after contrast material injection (n = 24), intermediate-weighted fast SE (n = 36) imaging, and T2-weighted fast SE (n = 36) imaging. Acquisition times of the sequences and signal-to-noise and contrast-to-noise ratios of bone, muscle, fat, and water for the two methods were compared quantitatively. Images were then qualitatively reviewed by two radiologists who were blinded to the type of fat suppression used. Image quality was scored according to four criteria (homogeneity of fat suppression, susceptibility and foldover artifacts, conspicuousness of lesion, and overall image quality) by using a five-point scale (0, bad; 1, poor; 2, fair; 3, good; and 4, excellent). A paired Student t test was used to compare the quantitative data, and a nonparametric paired-data Wilcoxon signed rank test was used for qualitative analysis.

RESULTS: Water excitation allowed a substantial decrease in acquisition time (by up to 50%) for T1-weighted sequences. Quantitative measurements revealed a greater signal-to-noise ratio (P < .01) with water excitation for all three sequences, whereas the contrast-to-noise ratio was greater with water excitation only in intermediate-weighted sequences (P < .01). Qualitatively, water excitation proved statistically better than or equal to fat saturation for all criteria in all imaging sequences (P < .05). Mean scores of overall image quality ranged between 2.5 and 3.0 for fat saturation and 3.4 and 3.7 for water excitation, respectively (P < .05).

CONCLUSION: Section-selective water excitation is faster than conventional fat saturation and produces images of better quality.

© RSNA, 2002

Index terms: Joints, injuries, 40.48 • Joints, MR, 48.121415 • Magnetic resonance (MR), fat suppression, 48.121415 • Magnetic resonance (MR), technology




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