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Three-dimensional radial ultrashort echo-time imaging with T2 adapted sampling

✍ Scribed by Jürgen Rahmer; Peter Börnert; Jan Groen; Clemens Bos

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
660 KB
Volume
55
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

The application of 3D radial sampling of the free‐induction decay to proton ultrashort echo‐time (UTE) imaging is reported. The effects of T~2~ decay during signal acquisition on the 3D radial point‐spread function are analyzed and compared to 2D radial and 1D sampling. It is found that in addition to the use of ultrashort TE, the proper choice of the acquisition‐window duration T~AQ~ is essential for imaging short‐T~2~ components. For 3D radial sampling, a maximal signal‐to‐noise ratio (SNR) with negligible decay‐induced loss in spatial resolution is obtained for an acquisition‐window duration of T~AQ~ ≈ 0.69 T~2~. For 2D and 1D sampling, corresponding values are derived as well. Phantom measurements confirm the theoretical findings and demonstrate the impact of different acquisition‐window durations on SNR and spatial resolution for a given T~2~ component. In vivo scans show the potential of 3D UTE imaging with T~2~‐adapted sampling for musculoskeletal imaging using standard MR equipment. The visualization of complex anatomy is demonstrated by extracting curved slices from the isotropically resolved 3D UTE image data. Magn Reson Med, 2006. © 2006 Wiley‐Liss, Inc.

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