Khoshhal Amir Reza, Torshabi Ahmad Esmaili, Zehtabian Mehdi
Faculty of Sciences and Modern Technologies, Graduate University of Advanced Technology, Kerman, Iran.
Faculty of Sciences and Modern Technologies, Graduate University of Advanced Technology, Kerman, Iran.
Appl Radiat Isot. 2025 Nov;225:111949. doi: 10.1016/j.apradiso.2025.111949. Epub 2025 May 29.
The increasing use of Computed Tomography (CT) significantly aids in diagnosing various diseases. However, patient radiation exposure remains a major concern. This study presents experimental dosimetry measurements of the radiation dose received by sensitive organs in the head and neck region during CT imaging with a Canon CT scanner using scan parameters of 135 kV, 150 mA, 6.6 s, and 5 mm slice thickness. Calibrated GR-200 Thermoluminescent Dosimeters (TLDs) were used to measure the absorbed doses at various points on a Rando phantom. A total of 84 TLDs were used for: the occipital (24) and temporal lobes (24), the thalamus (12), the hypothalamus (6), right parotid gland (4), eyes (4) and for background dose measurement (10). The absorbed doses were found to be 23.84 mGy for the occipital lobe, 23.11 mGy for the temporal lobe, 22.81 mGy for the hypothalamus, 22.94 mGy for the thalamus, 17.63 mGy for the left eye, 17.08 mGy for the right eye, and 28.08 mGy for the right parotid gland. The highest and lowest doses were observed in the right parotid gland and eyes, respectively. This study provides valuable insights for clinicians and radiologists, understanding the risk of overexposure with a quantitative vision in sensitive head and neck organs during scanning especially in pediatric and repeat-scan cases.
计算机断层扫描（CT）的使用日益增加，极大地有助于各种疾病的诊断。然而，患者的辐射暴露仍然是一个主要问题。本研究展示了使用佳能CT扫描仪，在135 kV、150 mA、6.6 s和5 mm层厚的扫描参数下进行CT成像时，头颈部区域敏感器官所接受辐射剂量的实验剂量测定。使用校准后的GR-200热释光剂量计（TLD）来测量兰多人体模型上不同点的吸收剂量。总共84个TLD用于：枕叶（24个）、颞叶（24个）、丘脑（12个）、下丘脑（6个）、右腮腺（4个）、眼睛（4个）以及用于背景剂量测量（10个）。发现枕叶的吸收剂量为23.84 mGy，颞叶为23.11 mGy，下丘脑为22.81 mGy，丘脑为22.94 mGy，左眼为17.63 mGy，右眼为17.08 mGy，右腮腺为28.08 mGy。最高和最低剂量分别出现在右腮腺和眼睛。这项研究为临床医生和放射科医生提供了有价值的见解，有助于他们在扫描过程中，尤其是儿科和重复扫描病例中，以定量的视角了解敏感头颈部器官过度暴露所带来的风险。
