Heiss S G, Li K C
Department of Radiology, Stanford University School of Medicine, California, USA.
Invest Radiol. 1998 Sep;33(9):670-81. doi: 10.1097/00004424-199809000-00023.
There has been continued development of MRI techniques for evaluating mesenteric vascular disease. Contrast-enhanced magnetic resonance angiography (MRA) can provide reproducible high resolution, high contrast images of the arterial and venous mesenteric vasculature and may allow detection of segmental ischemia by detection of segmental delayed mesenteric or bowel wall enhancement. Cine phase-contrast MRA can provide additional information about the rate and volume of flow within the major mesenteric arteries and veins. Real-time MRI can provide interactive visualization of the mesenteric vessels in any plane, and with suitable bowel contrast, it can be used to monitor global and segmental small bowel motility. With in vivo MR oximetry, flow independent measurements of the T2 relaxation of blood allow the oxygen saturation of the mesenteric circulation to be determined. These MR techniques can be combined for evaluating both anatomic and functional aspects of the mesenteric circulation.
用于评估肠系膜血管疾病的MRI技术一直在不断发展。对比增强磁共振血管造影（MRA）可以提供肠系膜动脉和静脉血管系统可重复的高分辨率、高对比度图像，并可能通过检测节段性延迟的肠系膜或肠壁强化来检测节段性缺血。电影相位对比MRA可以提供有关主要肠系膜动脉和静脉内血流速度和流量的额外信息。实时MRI可以在任何平面提供肠系膜血管的交互式可视化，并且在有合适的肠造影剂的情况下，可用于监测全段和节段性小肠蠕动。通过体内磁共振血氧测定法，对血液T2弛豫进行与血流无关的测量，可以确定肠系膜循环的氧饱和度。这些磁共振技术可以结合起来用于评估肠系膜循环的解剖和功能方面。
