Abdominal applications of 3.0-T MR imaging: Comparative review versus a 1.5-T system
Abdominal applications of 3.0-T MR imaging: Comparative review versus a 1.5-T system
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DOI：
10.1148/rg.e30
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发表时间：
2008-07-01
期刊：
影响因子：
5.5
通讯作者：
van Cauteren, Marc
中科院分区：
文献类型：
--
作者：
Choi, Jin-Young;Kim, Myeong-Jin;van Cauteren, Marc
随着专用接收线圈的发展和梯度性能的提高，3.0-T 磁共振 (MR) 系统在临床实践中获得了更广泛的认可。与 1.5-T MR 系统相比，预期信噪比 (SNR) 增加两倍，在与并行采集技术结合使用时，可能有助于提高空间分辨率或增加时间分辨率。在腹部应用 3.0-T MR 时必须考虑几个问题，包括射频场和弛豫时间的改变、能量沉积和磁化率效应的增加以及与运动伪影相关的问题。对于肝脏病变的评估，3.0-T 系统实现的更高的信噪比和更高的分辨率可以转化为通过调整成像参数获得的 T2 加权图像更好地检测恶性病变。对于胰腺和胆道疾病的评估，使用单次涡轮自旋回波序列的高分辨率 T2 加权成像非常有用；二维 MR 胰胆管造影图像的信噪比 (SNR) 改善非常明显。对于直肠癌的术前成像，单次拍摄序列可显着减少成像时间，同时保持图像质量。检查方案的大幅修改、优化的成像参数和序列设计以及硬件的持续开发，可能有助于增强 3.0-T 系统在腹部 MR 检查中的作用。
With the development of dedicated receiver coils and increased gradient performance, 3.0-T magnetic resonance (MR) systems are gaining wider acceptance in clinical practice. The expected twofold increase in signal-to-noise ratio (SNR) compared with that of 1.5-T MR systems may help improve spatial resolution or increase temporal resolution when used with parallel acquisition techniques. Several issues must be considered when applying 3.0-T MR in the abdomen, including the alteration of the radiofrequency field and relaxation time, increase in energy deposition and susceptibility effects, and problems associated with motion artifacts. For the evaluation of liver lesions, higher SNR and greater resolution achieved with the 3.0-T system could translate into better detection of malignant lesions on T2-weighted images obtained with adjusted imaging parameters. For the evaluation of pancreatic and biliary diseases, high-resolution T2-weighted imaging using single-shot turbo spin-echo sequences is useful; improvement in SNR was noticeable on two-dimensional MR cholangiopancreatographic images. For the preoperative imaging of rectal cancer, a single-shot sequence is useful for dramatically decreasing imaging time while maintaining image quality. Substantial modification of examination protocols, with optimized imaging parameters and sequence designs along with ongoing development of hardware, could contribute to an increased role of the 3.0-T system for abdominal MR examinations.