Yongbi M N, Ding S, Dunn J F
Department of Diagnostic Radiology, Dartmouth-Hitchcock Medical Center, Dartmouth Medical School, Hanover, NH 03755, USA.
J Magn Reson Imaging. 1995 Nov-Dec;5(6):768-72. doi: 10.1002/jmri.1880050625.
The selective suppression of fat using chemical shift selective (CHESS) sinc, gaussian presaturation, or binomial radiofrequency pulses are widely implemented techniques in magnetic resonance imaging. For applications wherein transmitter coils that generate inhomogeneous magnetic (B1), fields are used (e.g., surface coils), adiabatic radiofrequency pulses that are less susceptible to spatial variations in B1 amplitude will improve the spatial homogeneity of spin excitation angle. Herein, we describe the application of an adiabatic half-passage hyperbolic secant CHESS pulse suitable for acquiring fat-suppressed magnetic resonance images with surface coils on high-field systems. Images obtained from a water/fat phantom and from the abdominal region of a rat are presented indicating excellent suppression of fat signal from the entire coil-sensitive volume.
在磁共振成像中，利用化学位移选择（CHESS） sinc脉冲、高斯预饱和脉冲或二项式射频脉冲来选择性抑制脂肪是广泛应用的技术。对于使用产生不均匀磁场（B1）的发射线圈的应用（例如表面线圈），对B1幅度的空间变化不太敏感的绝热射频脉冲将改善自旋激发角的空间均匀性。在此，我们描述了一种绝热半通道双曲正割CHESS脉冲的应用，该脉冲适用于在高场系统上使用表面线圈获取脂肪抑制磁共振图像。展示了从水/脂肪模型以及大鼠腹部区域获得的图像，这些图像表明整个线圈敏感体积内的脂肪信号得到了出色的抑制。
