Submillisievert Computed Tomography of the Chest Using Model-Based Iterative Algorithm: Optimization of Tube Voltage With Regard to Patient Size
Submillisievert Computed Tomography of the Chest Using Model-Based Iterative Algorithm: Optimization of Tube Voltage With Regard to Patient Size
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DOI：
10.1097/rct.0000000000000505
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发表时间：
2017-03-01
影响因子：
1.3
通讯作者：
Wirth, Stefan
中科院分区：
文献类型：
--
作者：
Deak, Zsuzsanna;Maertz, Friedrich;Wirth, Stefan
目的：本研究的目的是利用基于模型的迭代算法在普通和超重患者中定义在降剂量胸部CT方案中软组织和血管可视化的最佳管电位。方法：本前瞻性研究纳入36例按照3种方案（120 kVp/噪声指数[NI], 60; 100 kVp/NI, 65; 80 kVp/NI, 70）接受胸部ct的患者，经伦理委员会批准。记录患者的身体参数和剂量描述符。采用基于模型的算法对图像进行重构。两名放射科医生评估图像质量和病变显著性；分别与统计算法重建的对照CT （120 kVp/NI, 20）进行比较。测量肌肉和脂肪组织衰减的均值和标准差以及主动脉的信噪比。结果：在120、100和80 kVp下，平均和超重患者分别在1.34、1.02和1.08 mGy和3.41、3.20和2.88 mGy下获得诊断图像（病变明显，95%-100%）。数据以CT剂量指数体积值给出。结论：基于模型的算法可实现亚毫西弗胸部CT扫描；建议使用100kvp。
Objective: The aim of this study was to define optimal tube potential for soft tissue and vessel visualization in dose-reduced chest CT protocols using model-based iterative algorithm in average and overweight patients.Methods: Thirty-six patients receiving chest CTaccording to 3 protocols (120 kVp/noise index [NI], 60; 100 kVp/NI, 65; 80 kVp/NI, 70) were included in this prospective study, approved by the ethics committee. Patients' physical parameters and dose descriptors were recorded. Images were reconstructed with model-based algorithm. Two radiologists evaluated image quality and lesion conspicuity; the protocols were intraindividually compared with preceding control CT reconstructed with statistical algorithm (120 kVp/NI, 20). Mean and standard deviation of attenuation of the muscle and fat tissues and signal-to-noise ratio of the aorta were measured.Results: Diagnostic images (lesion conspicuity, 95%-100%) were acquired in average and overweight patients at 1.34, 1.02, and 1.08 mGy and at 3.41, 3.20, and 2.88 mGy at 120, 100, and 80 kVp, respectively. Data are given as CT dose index volume values.Conclusions: Model-based algorithm allows for submillisievert chest CT in average patients; the use of 100 kVp is recommended.