Department of Radiological Technology, Tsuchiya General Hospital, Hiroshima 730-8655, Japan.
Department of Diagnostic Radiology, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima 734-0037, Japan.
Korean J Radiol. 2018 Mar-Apr;19(2):265-271. doi: 10.3348/kjr.2018.19.2.265. Epub 2018 Feb 22.
To evaluate the effect of patient characteristics on popliteal aortic contrast enhancement at lower extremity CT angiography (LE-CTA) scanning.
Prior informed consent to participate was obtained from all 158 patients. All were examined using a routine protocol; the scanning parameters were tube voltage 100 kVp, tube current 100 mA to 770 mA (noise index 12), 0.5-second rotation, 1.25-mm detector row width, 0.516 beam pitch, and 41.2-mm table movement, and the contrast material was 85.0 mL. Cardiac output (CO) was measured with a portable electrical velocimeter within 5 minutes of starting the CT scan. To evaluate the effects of age, sex, body size, CO, and scan delay on the CT number of popliteal artery, the researchers used multivariate regression analysis.
A significant positive correlation was seen between the CT number of the popliteal artery and the patient age ( = 0.39, < 0.01). A significant inverse correlation was observed between the CT number of the popliteal artery and the height ( = -0.48), total body weight ( = -0.52), body mass index ( = -0.33), body surface area (BSA) ( = -0.56), lean body weight ( = -0.56), and CO ( = -0.35) ( < 0.001 for all). There was no significant correlation between the enhancement and the scan delay ( = 0.06, = 0.47). The BSA, CO, and age had significant effects on the CT number (standardized regression: BSA -0.42, CO -0.22, age 0.15; < 0.05, respectively).
The BSA, CO, and age are significantly correlated with the CT number of the popliteal artery on LE-CTA.
评估患者特征对下肢 CT 血管造影（LE-CTA）扫描时腘动脉对比增强的影响。
对所有 158 例患者均获得了参与研究的事先知情同意。所有患者均采用常规方案进行检查；扫描参数为管电压 100 kVp、管电流 100 mA 至 770 mA（噪声指数 12）、0.5 秒旋转、1.25mm 探测器行宽、0.516 射线束螺距和 41.2mm 台移动，对比剂为 85.0mL。在开始 CT 扫描后 5 分钟内，使用便携式电速度计测量心输出量（CO）。为了评估年龄、性别、体型、CO 和扫描延迟对腘动脉 CT 数的影响，研究人员使用多元回归分析。
发现腘动脉 CT 数与患者年龄呈显著正相关（ = 0.39， < 0.01）。腘动脉 CT 数与身高（ = -0.48）、总体重（ = -0.52）、体重指数（ = -0.33）、体表面积（BSA）（ = -0.56）、去脂体重（ = -0.56）和 CO（ = -0.35）呈显著负相关（均<0.001）。增强与扫描延迟之间无显著相关性（ = 0.06， = 0.47）。BSA、CO 和年龄对 CT 数有显著影响（标准化回归：BSA-0.42、CO-0.22、年龄 0.15；均<0.05）。
BSA、CO 和年龄与 LE-CTA 中腘动脉的 CT 数显著相关。
