Department of Medical Physics and Biomedical Engineering, Faculty of Medicine, Shahid Beheshti University of Medical Sciences and Health Services, Tehran, Iran.
Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Med Radiat Sci. 2024 Jun;71(2):251-260. doi: 10.1002/jmrs.772. Epub 2024 Mar 7.
Concerns regarding the adverse consequences of radiation have increased due to the expanded application of computed tomography (CT) in medical practice. Certain studies have indicated that the radiation dosage depends on the anatomical region, the imaging technique employed and patient-specific variables. The aim of this study is to present fitting models for the estimation of age-specific dose estimates (ASDE), in the same direction of size-specific dose estimates, and effective doses based on patient age, gender and the type of CT examination used in paediatric head, chest and abdomen-pelvis imaging.
A total of 583 paediatric patients were included in the study. Radiometric data were gathered from DICOM files. The patients were categorised into five distinct groups (under 15 years of age), and the effective dose, organ dose and ASDE were computed for the CT examinations involving the head, chest and abdomen-pelvis. Finally, the best fitting models were presented for estimation of ASDE and effective doses based on patient age, gender and the type of examination.
The ASDE in head, chest, and abdomen-pelvis CT examinations increases with increasing age. As age increases, the effective dose in head and abdomen-pelvis CT scans decreased. However, for chest scans, the effective dose initially showed a decreasing trend until the first year of life; after that, it increases in correlation with age.
Based on the presented fitting model for the ASDE, these CT scan quantities depend on factors such as patient age and the type of CT examination. For the effective dose, the gender was also included in the fitting model. By utilising the information about the scan type, region and age, it becomes feasible to estimate the ASDE and effective dose using the models provided in this study.
由于计算机断层扫描（CT）在医学实践中的广泛应用，人们对辐射的不良后果的担忧日益增加。某些研究表明，辐射剂量取决于解剖部位、所使用的成像技术和患者个体变量。本研究旨在为基于患者年龄、性别和所进行的 CT 检查类型的儿科头部、胸部和腹部-骨盆成像的年龄特异性剂量估计（ASDE）、基于大小的剂量估计和有效剂量建立拟合模型。
共纳入 583 名儿科患者。从 DICOM 文件中收集放射测量数据。患者分为五个不同组（<15 岁），对头、胸和腹部-骨盆 CT 检查计算有效剂量、器官剂量和 ASDE。最后，提出了基于患者年龄、性别和检查类型的最佳拟合模型，用于估计 ASDE 和有效剂量。
头部、胸部和腹部-骨盆 CT 检查的 ASDE 随年龄增长而增加。随着年龄的增长，头部和腹部-骨盆 CT 扫描的有效剂量降低。然而，对于胸部扫描，有效剂量最初呈下降趋势，直到生命的第一年；之后，它与年龄呈正相关增加。
基于提出的 ASDE 拟合模型，这些 CT 扫描量取决于患者年龄和 CT 检查类型等因素。对于有效剂量，拟合模型中还包括了性别因素。利用扫描类型、部位和年龄的信息，使用本研究提供的模型估算 ASDE 和有效剂量成为可能。
