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DOI:10.2214/AJR.07.2661
AJR 2007; 189:1510-1515
© American Roentgen Ray Society

Technical Innovation

High-Resolution 3D Cartilage Imaging with IDEAL–SPGR at 3 T

David B. Siepmann1, Jeff McGovern2, Jean H. Brittain3 and Scott B. Reeder1,4

1 Department of Radiology, University of Wisconsin School of Medicine, 600 Highland Ave., CSC E1/374, Madison, WI 53792.
2 GE Healthcare, Waukesha, WI.
3 Global Applied Science Laboratory, GE Healthcare, Madison, WI.
4 Departments of Medical Physics, Biomedical Engineering, and Medicine, University of Wisconsin, Madison, WI.

OBJECTIVE. The purpose of this study was to perform imaging of cartilage at high resolution with a high signal-to-noise ratio (SNR) with a combination of iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) with parallel imaging at 3 T and spoiled gradient echo (SPGR) imaging. The findings with the combined technique were compared with those obtained with conventional fat-saturated SPGR imaging.

CONCLUSION. Compared with fat-saturated SPGR, IDEAL–SPGR imaging combined with parallel imaging at 3 T provides robust fat–water separation and significant improvement in cartilage SNR. Use of IDEAL–SPGR also led to dramatic improvement in cartilage–fluid contrast-to-noise ratio compared with fat-saturated SPGR imaging. Thus, use of IDEAL–SPGR may improve the accuracy of cartilage volume measurements and detection of cartilage surface defects. Excellent evaluation of the morphologic features of the knee cartilage with high-resolution, high-SNR images can be performed in 5 minutes.

Keywords: cartilage • fat suppression • knee • MRI • spoiled gradient echo • water–fat separation


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Copyright © 2007 by the American Roentgen Ray Society.