64层螺旋CT检查技术在肝脏中的应用

随着多层螺旋CT的飞速发展，64层螺旋CT已经应用于临床，其诸多优势在肝脏扫描中发挥着重要作用。64层螺旋CT亚毫米的准直极大的提高了纵轴空间分辨力，实现了真正意义的各向同性扫描，彻底解决了扫描范围、扫描时间和扫描层厚之间的矛盾。时间分辨力的提高使肝脏的扫描时间明显缩短，使得高速率及高浓度注射对比剂成为现实，而生理盐水冲刷技术可以在不降低图像质量的前提下节省对比剂的用量，真正的时相扫描亦得以实现。扫描时间的缩短亦推动了新的增强扫描技术的应用（小剂量实验和阈值触发技术）。灌注扫描的覆盖范围明显增加，使其更加准确。各向同性扫描的真正实现使得后处理技术得到充分的应用，为更优质的三维图像重建及更精确的显示组织及病变的结构打下了坚实的基础。

Application of 64-slice spiral CT in the liver

With the development of multi-slice spiral computed tomography （MSCT）, 64-slice spiral CT has been used in clinic and has a great impact on liver imaging. Sub-millimeter collimation improves longitudinal spatial resolution, making the acquired data set a real isotropic volume perfecdy, and has resolved completely the contradiction between scanning scope, scanning time and scanning slice. Due to the extremely short scanning window, contrast agent injection should be performed at high flow rate and followed by saline bolus chaser; the use of highly concentrated contrast media might be useful. Timing should be accurately either by a test bolus or automatic bolus-detection technique. A real isotropic volume perfecdy designed for optimal three-dimensional rendering and accurate organ and lesion.