OPTIMISATION OF A PAEDIATRIC CT BRAIN PROTOCOL: A FIGURE-OF-MERIT APPROACH

OPTIMISATION OF A PAEDIATRIC CT BRAIN PROTOCOL: A FIGURE-OF-MERIT APPROACH
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儿科 CT 脑部方案的优化:品质因数方法

DOI:
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发表时间:
2018
影响因子:
1
通讯作者:
M. Borg
M. Borg
中科院分区:
环境科学与生态学4区
文献类型:
--
作者:
Eric Pace;M. Borg

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儿科头部计算机断层扫描(CT)剂量优化使用三个品质因数(FOM),基于管电压,电流,噪声,体积计算机断层扫描剂量指数(CTDIvol)和对比噪声比(CNR)。FOM 1:相对于CTDIvol的空间分辨率和总最小对比度水平(N); FOM 2:相对于CTDIvol的噪声; FOM 3:相对于CTDIvol的CNR。阶段1:在Catphan上应用FOM 1和FOM 2,无需电流调制。第2阶段:在具有电流调制的拟人化体模上评估CTDIvol和噪声。第3阶段:所有FOM应用于通过电流调制采集的Catphan图像。结果表明,在所有FOM中,没有单个测试用例的性能优于当前方案(100 kVp,200 mA)。一些测试用例以更高的噪声为代价提供了剂量的减少。120 kVp、100 mA组合在剂量和噪声之间提供了良好的折衷。需要进一步研究,以确定是否可以将该方案添加到可接受较高噪声的手术中(例如颅缝早闭)。
Paediatric head computed tomography (CT) dose optimisation was carried out using three figure-of-merits (FOMs), based on tube voltage, current, noise, volumetric computed tomography dose index (CTDIvol) and contrast-to-noise ratio (CNR). FOM1: spatial resolution and total minimum contrast level (N) against CTDIvol; FOM2: noise against CTDIvol; FOM3: CNR against CTDIvol. Stage 1: Application of FOM1 and FOM2 on a Catphan without current modulation. Stage 2: CTDIvol and noise assessed on an anthropomorphic phantom with current modulation. Stage 3: All FOMs applied to Catphan images acquired with current modulation. Results indicated no single test case outperformed the current protocol (100 kVp, 200 mA) in all FOMs. Some test cases offered a reduction in dose at the cost of higher noise. The 120-kVp, 100-mA combination offered good compromise between dose and noise. Further investigation is required to determine whether this protocol could be added for procedures where higher noise is acceptable (e.g. craniosynostosis).
CT中降低辐射剂量水平的观察者性能的估计:消除过低剂量水平的降低是第一步。
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DOI: 10.2214/ajr.12.9026
发表时间: 2013-05
期刊: AJR. American journal of roentgenology
影响因子: --
作者:
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通讯作者: Thapa MM