Department of Radiology and Biomedical Imaging, University of California, San Francisco, California, USA.
J Magn Reson Imaging. 2011 Sep;34(3):691-5. doi: 10.1002/jmri.22648. Epub 2011 Jul 18.
To implement and examine the feasibility of a three-dimensional (3D) ultrashort TE (UTE) sequence on a 7 Tesla (T) clinical MR scanner in comparison with 3T MRI at high isotropic resolution.
Using an in-house built saddle coil at both field strengths we have imaged mid-diaphysial sections of five fresh cadaveric specimens of the distal tibia. An additional in vivo scan was performed at 7 Tesla using a quadrature knee coil.
Using the same type of saddle coil at both field strengths, a significant increase in SNR at 7T compared with 3T (factor 1.7) was found. Significantly shorter T2* values were found at the higher field strength (T2* = 552.2 ± 126 μs at 7T versus T2* = 1163 ± 391 μs at 3T).
UHF MRI at 7T has great potential for imaging tissues with short T2.
在 7 特斯拉（T）临床磁共振扫描仪上实施并检查三维（3D）超短 TE（UTE）序列的可行性，与高各向同性分辨率的 3T MRI 进行比较。
在两种场强下使用内部构建的鞍形线圈，对 5 个新鲜的尸体标本的胫骨中段进行成像。在 7T 时使用正交膝关节线圈进行了额外的体内扫描。
在两种场强下使用相同类型的鞍形线圈，在 7T 时与 3T 相比，SNR 显著增加（1.7 倍）。在更高的场强下，T2* 值明显缩短（7T 时 T2*=552.2±126μs，3T 时 T2*=1163±391μs）。
7T 的 UHF MRI 具有对短 T2 组织成像的巨大潜力。
