Department of Radiology, Beaumont Hospital, Beaumont, Dublin 9, Ireland.
Radiographics. 2010 Jan;30(1):201-18. doi: 10.1148/rg.301095519.
The search for an acceptable colorectal cancer screening examination has led to the development of virtual colonoscopy, which includes both computed tomographic (CT) colonography and magnetic resonance (MR) colonography. As indicated by the much larger number of published studies on CT colonography than on MR colonography, multidetector CT appears to be more suitable for colorectal screening than does MR colonography, in part reflecting the ease and speed of performing CT, as well as the increased spatial resolution, decreased cost, and wider availability of CT colonography. The main advantage of MR colonography over CT colonography is that it does not use ionizing radiation, which has important implications for colorectal cancer screening. The use of dark-lumen MR colonography to screen patients for colorectal cancer as well as other abdominopelvic disease could make it more attractive than CT. With the integration of 3.0-T MR colonography, fecal tagging, and parallel imaging into research and clinical settings, new MR colonography protocols must be optimized. Future MR colonography research should address issues such as image characteristics, presence of artifacts, management of specific absorption rate, and hardware-related modifications.
寻找一种可接受的结直肠癌筛查检查方法促使了虚拟结肠镜检查的发展，其中包括计算机断层扫描（CT）结肠成像和磁共振（MR）结肠成像。由于关于 CT 结肠成像的发表研究数量远远多于关于 MR 结肠成像的研究，多排 CT 似乎比 MR 结肠成像更适合结直肠筛查，这在一定程度上反映了 CT 检查的简便和快速，以及空间分辨率的提高、成本的降低和 CT 结肠成像的广泛应用。MR 结肠成像相对于 CT 结肠成像的主要优势在于它不使用电离辐射，这对结直肠癌筛查具有重要意义。使用黑暗腔 MR 结肠成像对患者进行结直肠癌以及其他腹部和盆腔疾病的筛查可能会使其比 CT 更具吸引力。随着 3.0-T MR 结肠成像、粪便标记和并行成像技术在研究和临床环境中的整合，必须优化新的 MR 结肠成像方案。未来的 MR 结肠成像研究应解决图像特征、伪影存在、特定吸收率管理以及与硬件相关的修改等问题。
