Comparison of patient doses at different CT scanners with same acquisition protocol

L. Balkay, A. Oszhinszki, A. Krizsan
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引用次数: 3

Abstract

In the last decade both the number of powerful CT scanners and the number of patient investigations increased with a consequent increase of the patient radiation dose. There are large dose variations (more than 10 fold) among individual CT centers and it remains true if they include the same model of CT scanners. The aim of this study was to compare the patient effective dose (De) during the CT examinations from different manufacturer models presuming the same acquisition protocol and using the imPACT patient organ and effective dose calculator program. The following manufacturers and models were selected in the program: GE (LightSpeed Ultra, LightSpeed 16, LightSpeed Pro 16, LightSpeed VCT), Philips (Brilliance 16, Brilliance 16 Power, Big Bore, Brilliance 64/40) and the Siemens (Emotion 6, Sensation 16, Sensation 16 Straton, Sensation 64, Definition AS). Head and body scans were defined for all cases altering tube voltages, while dose calculations were normalized to 100 mAs X-ray exposure. It was found that in body investigations the calculated De for the GE scans were higher by 20% comparing to Siemens and Philips related values. For the head examinations the differences were larger by almost 55%. We also demonstrated that a power relationship can be found between the De and the tube voltage with the exponent of 3.02±0.14 kV-1 and 2.68±0.14 kV-1 for the body and the head scans respectively. It can be concluded that the patient effective dose could be different in CT examinations using distinct CT scanners but defining the same acquisition protocol. Considering the patient dose, this also means that the scan protocols cannot be transferred between different models without specific investigation.
采用相同获取方案的不同CT扫描仪对患者剂量的比较
在过去十年中,强力CT扫描仪的数量和病人检查的数量都随着病人放射剂量的增加而增加。在各个CT中心之间存在很大的剂量差异(超过10倍),如果它们使用相同型号的CT扫描仪,情况仍然如此。本研究的目的是在相同的获取方案下,使用imPACT患者器官和有效剂量计算器程序,比较不同制造商型号CT检查时患者的有效剂量(De)。该计划选择了以下制造商和型号:GE (LightSpeed Ultra, LightSpeed 16, LightSpeed Pro 16, LightSpeed VCT),飞利浦(Brilliance 16, Brilliance 16 Power, Big Bore, Brilliance 64/40)和西门子(Emotion 6, Sensation 16, Sensation 16 Straton, Sensation 64, Definition AS)。对所有改变管电压的病例进行头部和身体扫描,而剂量计算归一化为100 mAs x射线照射。研究发现,在身体检查中,与西门子和飞利浦的相关值相比,GE扫描计算出的De高出20%。对于头部检查,差异更大,接近55%。我们还证明,在身体和头部扫描中,De和管电压之间存在幂函数关系,分别为3.02±0.14 kV-1和2.68±0.14 kV-1。可以得出结论,使用不同的CT扫描仪进行CT检查时,患者的有效剂量可能不同,但定义了相同的获取方案。考虑到患者的剂量,这也意味着扫描方案不能在没有具体调查的情况下在不同的模型之间转移。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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