Coronary computed tomography angiography at 140 kV versus 120 kV: assessment of image quality and radiation exposure in overweight and moderately obese patients
Coronary computed tomography angiography at 140 kV versus 120 kV: assessment of image quality and radiation exposure in overweight and moderately obese patients
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DOI：
10.1177/0284185113502745
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发表时间：
2014-06-01
期刊：
影响因子：
1.3
通讯作者：
Ghoshhajra, Brian B.
中科院分区：
文献类型：
--
作者：
Lee, Ashley M.;Engel, Leif-Christopher;Ghoshhajra, Brian B.
背景：尽管在大多数计算机断层扫描（CT）扫描仪上可以获得140千伏的管电位，但其相对于120千伏的增量诊断价值一直存在争议。目的：回顾性评价超重和中度肥胖患者在140千伏下进行心脏计算机断层血管造影（CCTA）的图像质量和辐射暴露，并与120千伏下进行CCTA进行比较。材料和方法：纳入2010年1月至2012年5月间转诊行CCTA的88例患者。44例超重或中度肥胖患者（体重指数[BMI]， 25-35 kg/m(2)）在140 kV双源CT （DSCT）扫描仪下进行CCTA。根据BMI、平均心率、扫描指征和扫描采集模式，确定了44例在120 kV下行CCTA和DSCT的匹配对照组。所有的扫描都是在医生的直接监督下按照常规方案进行的。定量图像指标（CT衰减、图像噪声、噪比[CNR]、左主干[LM]和右近端冠状动脉[RCA]的信噪比[SNR]）评估。比较两组患者的有效辐射剂量。结果：总的来说，所有的扫描都是诊断性的，没有任何不可评估的冠状动脉段。与120 kV相比，140 kV的衰减和图像噪声更低
Background: Although a tube potential of 140 kV is available on most computed tomography (CT) scanners, its incremental diagnostic value versus 120 kV has been controversial.Purpose: To retrospectively evaluate the image quality and radiation exposure of cardiac computed tomography angiography (CCTA) performed at 140 kV in comparison to CCTA at 120 kV in overweight and moderately obese patients.Material and Methods: Eighty-eight patients who were referred for CCTA between January 2010 and May 2012 were included. Forty-four patients who were overweight or moderately obese (body mass index [BMI], 25-35 kg/m(2)) underwent CCTA with dual-source CT (DSCT) scanner at 140 kV. Forty-four match controls who underwent CCTA with DSCT at 120 kV were identified per BMI, average heart rate, scan indication, and scan acquisition mode. All scans were performed per routine protocols with direct physician supervision. Quantitative image metrics (CT attenuation, image noise, contrast-to-noise ratio [CNR], and signal-to-noise ratio [SNR] of left main [LM] and proximal right coronary artery [RCA]) were assessed. Effective radiation dose was compared between the two groups.Results: Overall, all scans were diagnostic without any non-evaluable coronary segment per clinical report. 140 kV had a lower attenuation and image noise versus 120 kV (P