Low-tube-voltage selection for non-contrast-enhanced CT: Comparison of the radiation dose in pediatric and adult phantoms
Low-tube-voltage selection for non-contrast-enhanced CT: Comparison of the radiation dose in pediatric and adult phantoms
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DOI：
10.1016/j.ejmp.2015.12.005
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发表时间：
2016-01-01
影响因子：
3.4
通讯作者：
Awai, Kazuo
中科院分区：
文献类型：
--
作者：
Shimonobo, Toshiaki;Funama, Yoshinori;Awai, Kazuo
目的：我们使用儿童和成人拟人模型来比较低管电压和标准管电压胸部和腹部非增强计算机断层扫描 (CT) 扫描的辐射剂量。我们还讨论了非造影增强 CT 的最佳低管电压。方法：使用一个成年女性和三个不同大小的儿童拟人体模，我们在 320 多排 CT 体积扫描仪上获得胸部和腹部非造影增强扫描。管电压设置为 80、100 和 120 kVp。根据设定的图像噪声水平，在 CT 扫描仪上自动分配管电流。我们使用高灵敏度金属氧化物半导体场效应晶体管探测器在每个体模和每个管电压下测量表面和中心剂量。结果：5 岁儿童胸部和腹部 CT 扫描的平均表面剂量在 80 kVp 时为 4.4 和 5.3 mGy，在 100 kV 时为 4.5 和 5.4 mGy，在 100 kV 时为 4.0 和 5.0 mGy。分别为 120 kVp。这些值在我们的 3 个儿童模型中相似 (p > 0.05)。随着管电压从 120 kVp 降低到 80 kVp (p < 0.01)，成人体模的胸部平均表面剂量从 14.7 mGy 增加到 19.4 mGy，腹部 CT 从 18.7 mGy 增加到 24.8 mGy (p < 0.01)。结论：与成人相比，尽管管电压降低，儿童患者的表面和中心剂量几乎相同，并且可以使用低管电压技术 非增强胸部和腹部扫描。 (C) 2015 年意大利医疗协会。由爱思唯尔有限公司出版。保留所有权利。
Purpose: We used pediatric and adult anthropomorphic phantoms to compare the radiation dose of low- and standard tube voltage chest and abdominal non-contrast-enhanced computed tomography (CT) scans. We also discuss the optimal low tube voltage for non-contrast-enhanced CT.Methods: Using a female adult- and three differently-sized pediatric anthropomorphic phantoms we acquired chest and abdominal non-contrast-enhanced scans on a 320-multidetector CT volume scanner. The tube voltage was set at 80-, 100-, and 120 kVp. The tube current was automatically assigned on the CT scanner in response to the set image noise level. On each phantom and at each tube voltage we measured the surface and center dose using high-sensitivity metal-oxide-semiconductor field-effect transistor detectors.Results: The mean surface dose of chest and abdominal CT scans in 5-year olds was 4.4 and 5.3 mGy at 80 kVp, 4.5 and 5.4 mGy at 100 kV, and 4.0 and 5.0 mGy at 120 kVp, respectively. These values were similar in our 3-pediatric phantoms (p > 0.05). The mean surface dose in the adult phantom increased from 14.7 to 19.4 mGy for chest- and from 18.7 to 24.8 mGy for abdominal CT as the tube voltage decreased from 120 to 80 kVp (p < 0.01).Conclusion: Compared to adults, the surface and center dose for pediatric patients is almost the same despite a decrease in the tube voltage and the low tube voltage technique can be used for non-contrast-enhanced chest- and abdominal scanning. (C) 2015 Associazione Italiana di Fisica Medica. Published by Elsevier Ltd. All rights reserved.