Spectrally selective suppression techniques are often generically referred to as "Chem Sat" or CHESS (Chemical Shift Selective) methods. The fat (or water) peak may be selectively saturated by a narrow-bandwidth radiofrequency (RF)-pulse.

CHESS (Fat-Sat). This is the most widely used method for fat suppression. An RF-pulse tuned to the fat resonance frequency together with a spoiler gradient saturates and dephases fat protons, leaving only water protons to produce a signal. The technique is very versatile and can be appended to any pulse sequence.

频率饱和脉冲根据其 化学位移 抑制特定频率的化学物质，通常是脂肪。 也称为Fat-Sat或化学位移选择性 (CHESS)序列，这些是短时 RF 脉冲，调谐到脂肪的共振频率，并在 MR 成像序列开始之前立即应用。 化学选择性脉冲导致来自脂肪的信号无效（饱和），而水信号相对不受影响。 由于移动的皮下脂肪是运动伪影的主要来源，因此在整个图像中抑制脂肪会导致伪影减少。 第四种重要类型的 射频脉冲 也存在，称为空间频率 (SPSP) 脉冲。 这可以被认为是空间和频率饱和脉冲之 …

a chemical shift selective (CHESS) imaging technique which destroys the unwanted signal component by means of a selective 90” excitation pulse and a subsequent magnetic field gradient (‘homogeneity spoiling gradient’) prior to imaging of the wanted com-

2011年6月1日 · A chemical shift selective (CHESS) radiofrequency (RF) pulse is commonly used for fat saturation (FATSAT) (1, 2). To suppress the signal from lipids, the CHESS pulse nutates the lipid magnetization to the transverse plane, while leaving the water magnetization unperturbed along the longitudinal axis.

CHESS is a technique that is commonly used in musculoskeletal MR imaging to suppress fat in a number of joints, such as the knee, hand, and wrist. It is also used in MR arthrography because of its selectivity for fat, high SNR, and relatively fast examination time. Compared with inversion-recovery techniques, the fat selectivity of CHESS

Robust and accurate fat suppression is highly desirable in breast magnetic resonance imaging (MRI) because it can considerably improve the image quality and lesion conspicuity. However, fat...

2022年5月15日 · CHESS法との比較 CHESS法よりも 「 信号雑音比が 低下する 」 「 撮像時間が 延長しやすい 」 「 加熱効果の影響を 受けにくい 」 「 磁場の不均一性に 左右されにくい 」 ③水/脂肪信号相殺法. 試16-8、13-23 参考：完全解説P333 (WFS、Dixon、Chopper、GRE法式Dixon、IDEAL ...

(CHESS) A sequence for water suppression in proton MR spectroscopy and for water or fat suppression in MR imaging. This technique uses a frequency-selective 90° pulse to selectively excite the water signal, followed by a spoiler gradient to dephase the resulting magnetization.

MRI Fat Saturation (Fat Sat, CHESS, SPIR, SPECIAL) In the triglyceride molecules of fat, the electronic environment (shield) of the protons is not the same as that of water molecules. The 2 kinds of molecules have different proton resonance …