Bondestam S, Lamminen A, Komu M, Poutanen V P, Alanen A, Halavaara J
Department of Radiology, Meilahti Hospital, Helsinki University Central Hospital, Finland.
Magn Reson Imaging. 1992;10(6):989-95. doi: 10.1016/0730-725x(92)90454-8.
A method for windowing specific T1 values is presented. A 1.0 T imager with two routine pulse sequences was employed: A T1-weighted spin echo (SE) sequence and a short tau inversion recovery STIR sequence (fat-suppressed IR). A T1 window for fat was obtained by subtracting the STIR image from the SE image. Negative values were coded black. The method was tested on a normal human thigh, on a human liver with confirmed fatty infiltration, and on the livers of four live burbots. The fat-containing tissues of the two human volunteers were well depicted. The differences in fat concentration among the burbot livers were also clearly shown. The fat intensity seen in the images correlated well with the chemically measured fat concentration. This subtraction method for windowing T1 values proved feasible for fat. The method could be used for tissues with other short T1 values as well.
本文介绍了一种对特定T1值进行开窗处理的方法。使用了一台带有两种常规脉冲序列的1.0 T成像仪：一个T1加权自旋回波（SE）序列和一个短反转时间反转恢复（STIR）序列（脂肪抑制反转恢复序列）。通过从SE图像中减去STIR图像获得脂肪的T1窗口。负值编码为黑色。该方法在正常人体大腿、确诊有脂肪浸润的人体肝脏以及四只活江鳕的肝脏上进行了测试。两名人类志愿者的含脂肪组织得到了很好的显示。江鳕肝脏之间脂肪浓度的差异也清晰可见。图像中看到的脂肪强度与化学测量的脂肪浓度相关性良好。这种对T1值进行开窗处理的减法方法被证明对脂肪是可行的。该方法也可用于其他具有短T1值的组织。
