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首页> 外文期刊>Academic radiology >Variability of repeated coronary artery calcium scoring and radiation Dose on 64- and 16-slice computed tomography by prospective electrocardiographically-triggered axial and retrospective electrocardiographically-gated spiral computed tomography: a phantom study
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Variability of repeated coronary artery calcium scoring and radiation Dose on 64- and 16-slice computed tomography by prospective electrocardiographically-triggered axial and retrospective electrocardiographically-gated spiral computed tomography: a phantom study

机译：通过前瞻性心电触发轴向和回顾性心电门控螺旋计算机断层扫描在64层和16层计算机断层扫描上重复冠状动脉钙评分和放射剂量的变异性：一项幻像研究

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RATIONALE AND OBJECTIVES: We sought to compare coronary artery calcium (CAC) scores, the variability and radiation doses on 64- and 16-slice computed tomography (CT) scanners by both prospective electrocardiographically (ECG)-triggered and retrospective ECG-gated scans. MATERIALS AND METHODS: Coronary artery models (n = 3) with different plaque CT densities (approximately 240 Hounsfield units [HU], approximately 600 HU, and approximately 1000 HU) of four sizes (1, 3, 5, and 10 mm in length) on a cardiac phantom were scanned three times in five heart rate sequences. The tube current-time products were set to almost the same on all four protocols (32.7 mAs for 64-slice prospective and retrospective scans, 33.3 mAs for 16-slice prospective and retrospective scans). Slice thickness was set to 2.5 mm to keep the radiation dose low. Overlapping reconstruction with a 1.25-mm increment was applied on the retrospective ECG-gated scan. RESULTS: The CAC scores were not different between the four protocols (one-factor analysis of variance: Agatston, P = .32; volume, P = .19; and mass, P = .09). Two-factor factorial analysis of variance test revealed that the interscan variability was different between protocols (P < .01) and scoring algorithms (P < .01). The average variability of Agatston/volume/mass scoring and effective doses were as follows: 64-slice prospective scan: 16%/15%/11% and 0.5 mSv; 64-slice retrospective scan: 11%/11%/8% and 3.7 mSv; 16-slice prospective scan: 20%/18%/13% and 0.6 mSv; and 16-slice retrospective scan: 16%/15%/11% and 2.9 to 3.5 mSv (depending on the pitch). CONCLUSION: Retrospective ECG-gated 64-slice CT showed the lowest variability. Prospective ECG-triggered 64-slice CT, with low radiation dose, shows low variability on CAC scoring comparable to retrospective ECG-gated 16-slice CT.
机译：理由和目的：我们试图通过前瞻性心电图（ECG）触发和回顾性ECG门控扫描比较64层和16层计算机断层扫描（CT）扫描仪上的冠状动脉钙（CAC）评分，变异性和放射剂量。材料和方法：四种尺寸（长度分别为1、3、5和10毫米）具有不同斑块CT密度（大约240霍恩斯菲尔德单位[HU]，大约600 HU和大约1000 HU）的冠状动脉模型（n = 3） ）在心脏幻影上以5个心率序列进行了3次扫描。在所有四个协议中，管电流时间乘积几乎都设置为相同（64层前瞻性和回顾性扫描为32.7 mA，16层前瞻性和回顾性扫描为33.3 mA）。将切片厚度设置为2.5 mm，以保持较低的辐射剂量。回顾性ECG门控扫描采用1.25mm增量的重叠重建。结果：四种方案之间的CAC评分无差异（方差的一因素分析：Agatston，P = 0.32;体积，P = .19;质量，P = .09）。方差测试的两因素因子分析表明，协议之间的扫描间可变性（P <.01）和评分算法之间存在差异（P <.01）。 Agatston /体积/质量得分和有效剂量的平均变异性如下：64层前瞻性扫描：16％/ 15％/ 11％和0.5 mSv; 64层回顾性扫描：11％/ 11％/ 8％和3.7 mSv; 16层前瞻性扫描：20％/ 18％/ 13％和0.6 mSv;和16片回顾性扫描：16％/ 15％/ 11％和2.9至3.5 mSv（取决于音高）。结论：回顾性心电门控64排CT变异性最低。低辐射剂量的前瞻性ECG触发64层CT与回顾性ECG门控16层CT相比，在CAC评分上显示出较低的变异性。

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