Optimization of automatic bolus tracking for timing of the arterial phase of helical liver CT
Optimization of automatic bolus tracking for timing of the arterial phase of helical liver CT
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DOI：
10.1007/s003300000816
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发表时间：
2001-01-01
影响因子：
5.9
通讯作者：
Hahn, D
中科院分区：
文献类型：
--
作者：
Sandstede, JJW;Tschammler, A;Hahn, D
本研究的目的是优化双相螺旋肝脏CT动脉相定时的团注跟踪，并将优化的团注跟踪与标准延迟进行比较。150例患者接受了6种方案的检查：以3 ml/s的速度注射120 ml造影剂后，在腹腔动脉起始处的主动脉中以50或75或100 HU的增强阈值触发后延迟5或10 s。动脉强化以门静脉期肝脏强化20-30%为最佳。另外50名患者进行了检查与优化的协议，并与50名性别和年龄匹配的患者进行了25秒的标准延迟。在75-HU阈值后延迟10秒导致大多数患者具有最佳动脉相位（p < 0.01）。75例患者中有31例采用该方案检查，显示出最佳的早期肝脏增强。与标准延迟相比，推注跟踪仅显示差异趋势（p = 0.07）。自动大剂量跟踪的结果因所用方案而异;然而，仅在41%的患者中观察到最佳动脉期成像，表明与标准延迟相比，仅存在上级定时的趋势。
The aim of this study was to optimize bolus tracking for timing of the arterial phase of biphasic helical liver CT and to compare optimized bolus tracking to a standard delay. One hundred fifty patients were examined with six protocols: 5- or 10-s delay after triggering at a threshold of 50 or 75 or 100 HU enhancement in the aorta at the origin of the celiac arteries after injection of 120 ml contrast material at 3 ml/s. Optimal arterial enhancement was defined as 20-30% of hepatic enhancement in portal venous phase. Another 50 patients were examined with the optimized protocol and compared to 50 gender- and age-matched patients who underwent a 25-s standard delay. A 10-s delay after the 75-HU threshold resulted in the most patients with an optimal arterial phase (p < 0.01). Thirty-one of 75 patients examined with this protocol showed optimal early liver enhancement. Bolus tracking compared with standard delay revealed only a trend for a difference (p = 0.07). The outcome of automatic bolus tracking differs depending on the protocol used; however, optimal arterial phase imaging was seen in only 41% of patients, indicating only a trend for superior timing compared with a standard delay.