Teefey S A, Baron R L, Schulte S J, Shuman W P
Department of Radiology, University of Washington School of Medicine, Seattle Veterans Administration Medical Center 98105.
Radiology. 1990 Jun;175(3):683-5. doi: 10.1148/radiology.175.3.2343113.
A study was done to find the best technique of administering contrast material intravenously to enable differentiation of pelvic veins and enlarged lymph nodes on computed tomographic (CT) scans. Seventy-eight patients with suspected pelvic malignancies were evaluated with CT. After precontrast scans were obtained at a selected pelvic level, 150 mL of contrast material was injected as a two-phase bolus; images were obtained at the same level 1.5, 3, 5, and 7 minutes after initiation of the bolus. Mean pelvic venous enhancement was maximal between 3 and 7 minutes in all the patients. Venous attenuation changes did not correlate with the presence of cardiac or peripheral vascular disease, but there was significantly less enhancement in patients with diabetes mellitus. The time of maximum vein enhancement begins at 3 minutes and continues for at least 4 minutes. A delayed technique of scanning the pelvis may be preferable to rapid scanning to optimize enhancement of the pelvic veins.
开展了一项研究，旨在找出静脉注射造影剂的最佳技术，以便在计算机断层扫描（CT）中区分盆腔静脉和肿大的淋巴结。对78例疑似盆腔恶性肿瘤患者进行了CT评估。在选定的盆腔层面进行平扫后，以双期团注方式注入150毫升造影剂；在团注开始后1.5、3、5和7分钟在同一层面进行图像采集。所有患者盆腔静脉平均强化在3至7分钟达到最大值。静脉衰减变化与心脏或外周血管疾病的存在无关，但糖尿病患者的强化明显较少。静脉强化最大值的时间从3分钟开始，持续至少4分钟。为优化盆腔静脉强化，延迟扫描盆腔的技术可能比快速扫描更可取。
