Sakurai K, Fujita N, Murakami T, Kim S, Harada K, Kozuka T
Department of Radiology, Osaka University Medical School.
Nihon Igaku Hoshasen Gakkai Zasshi. 1990 Aug 25;50(8):910-7.
Phantom and volunteer study was performed with spin-echo sequences of different sampling bandwidths to evaluate the narrow bandwidth signal acquisition technique. Our results demonstrated the characteristics of the narrow bandwidth sequence as follows: SNR improvement, sensitive to the field inhomogeneity and motion, loss of edge definition for short T2 tissues, and prominent chemical shift artifacts. Narrow bandwidth sequence with flow compensation was suitable for brain T2 weighted images because of its high SNR and less artifacts. In spite of the improvement of SNR, the narrow bandwidth technique may be inappropriate for short T2 tissues such as muscle, because of prominent chemical shift artifacts and loss of edge definition. Consequently, sampling bandwidth is one of the parameters which can be manipulated to improve MR image quality.
使用不同采样带宽的自旋回波序列进行了体模和志愿者研究，以评估窄带宽信号采集技术。我们的结果表明窄带宽序列具有以下特征：信噪比提高、对场不均匀性和运动敏感、短T2组织的边缘清晰度丧失以及明显的化学位移伪影。具有流动补偿的窄带宽序列因其高信噪比和较少伪影而适用于脑部T2加权图像。尽管信噪比有所提高，但由于明显的化学位移伪影和边缘清晰度丧失，窄带宽技术可能不适用于肌肉等短T2组织。因此，采样带宽是可以操控以提高磁共振图像质量的参数之一。
