Mohammadbeigi Ahmad, Khoshgard Karim, Haghparast Abbas, Eivazi Mohammad Taghi
M.Sc in Medical Physics, Students Research Committee, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran.
Department of Medical Physics, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran.
Radiat Prot Dosimetry. 2019 Dec 31;186(4):496-506. doi: 10.1093/rpd/ncz056.
Due to the radiosensitivity of paediatric patients to X-ray, it is necessary to survey the paediatric DRLs using size-specific dose estimates (SSDE). In the present study, we determined the local diagnostic reference levels (DRLs) for paediatric chest, head and abdomen-pelvis CT examinations and their Surview scans in Kermanshah city, Iran. For ≤1 year, 1-5 years, 5-10 years and 10-15 years the DRLs (mGy) based on SSDE were determined N/A, 6.00, 6.25, 8.27 for abdomen-pelvis, and 8.74, 7.45, 11.15, 10.45 for chest and 19.05, 18.33, 18.22, 20.14 for head examinations, respectively. The differences between body size and default phantom defined in CT scanners are significant and should be considered when determining the DRLs. Based on our findings, use of CTDIv and SSDE parameters for determining DRLs leads to significant different results in children; thus SSDE is suggested as a more accurate index than CTDIV for establishing DRLs in paediatric CT examinations.
由于儿科患者对X射线具有放射敏感性，因此有必要使用特定尺寸剂量估计值（SSDE）来调查儿科诊断参考水平（DRL）。在本研究中，我们确定了伊朗克尔曼沙阿市儿科胸部、头部及腹部-盆腔CT检查及其Surview扫描的当地诊断参考水平。对于≤1岁、1 - 5岁、5 - 10岁和10 - 15岁儿童，基于SSDE的腹部-盆腔DRL（mGy）分别为无数据、6.00、6.25、8.27；胸部分别为8.74、7.45、11.15、10.45；头部检查分别为19.05、18.33、18.22、20.14。CT扫描仪中定义的身体尺寸与默认体模之间存在显著差异，在确定DRL时应予以考虑。基于我们的研究结果，使用CTDIv和SSDE参数来确定DRL在儿童中会导致显著不同的结果；因此，对于儿科CT检查，建议使用SSDE作为比CTDIV更准确的指标来建立DRL。
