Ma Hillgan, Elbakri Idris A, Reed Martin
Department of Physics and Astronomy University of British Columbia Vancouver, BC, Canada.
Radiat Prot Dosimetry. 2013 Sep;156(2):160-7. doi: 10.1093/rpd/nct050. Epub 2013 Mar 21.
Neonatal intensive care patients undergo frequent chest and abdomen radiographic imaging. In this study, the organ doses and the effective dose resulting from combined chest-abdomen radiography of the newborn child are determined. These values are calculated using the Monte Carlo simulation software PCXCM 2.0 and compared with direct dose measurements obtained from thermoluminescent detectors (TLDs) in a physical phantom. The effective dose obtained from PCXMC is 21.2 ± 0.7 μSv and that obtained from TLD measurements is 22.0 ± 0.5 μSv. While the two methods are in close agreement with regard to the effective dose, there is a wide range of variation in organ doses, ranging from 85 % difference for the testes to 1.4 % for the lungs. Large organ dose variations are attributed to organs at the edge of the field of view, or organs with large experimental error or simulation uncertainty. This study suggests that PCXMC can be used to estimate organ and effective doses for newborn patients.
新生儿重症监护患者需要频繁进行胸部和腹部的放射成像。在本研究中，测定了新生儿胸部 - 腹部联合放射成像产生的器官剂量和有效剂量。这些值使用蒙特卡罗模拟软件PCXCM 2.0进行计算，并与在物理模型中通过热释光探测器（TLD）获得的直接剂量测量值进行比较。通过PCXMC获得的有效剂量为21.2±0.7μSv，通过TLD测量获得的有效剂量为22.0±0.5μSv。虽然两种方法在有效剂量方面非常一致，但器官剂量存在很大的变化范围，从睾丸的85%差异到肺部的1.4%差异。较大的器官剂量变化归因于视野边缘的器官，或具有较大实验误差或模拟不确定性的器官。本研究表明，PCXMC可用于估计新生儿患者的器官剂量和有效剂量。
