Ploussi Agapi, Stathopoulos Ioannis, Syrgiamiotis Vasileios, Makri Triantafillia, Hatzigiorgi Christiana, Platoni Kalliopi, Carinou Eleftheria, Efstathopoulos Efstathios P
Second Department of Radiology, University General Hospital 'Attikon', School of Medicine, National and Kapodistrian University of Athens, 12462 Athens, Greece.
Children's Hospital Agia Sophia, CT-MRI Department, 11527 Athens, Greece.
Radiat Prot Dosimetry. 2018 May 1;179(3):199-205. doi: 10.1093/rpd/ncx251.
Pediatric brain computed tomography (CT) is identified as the most frequent CT examination in children. The aim of the study is the direct measurement of skin, eye lens and thyroid dose in pediatric patients during brain CT examinations. The study included 35 pediatric patients who underwent brain CT examinations. The patients were categorized in three age groups: Group A (age range: 0.8-1 years), Group B (age range: 2.0-4.9 years) and Group C (age range: 5.5-15.5 years). thermoluminescent dosimeters (TLDs) were placed on the eyes, the frontal region of the head, the mastoid apophysis and the thyroid gland. The skin dose was found 16.6 ± 1.5, 38.8 ± 5.1 and 41.7 ± 9.4 mGy for Groups A, B and C, respectively. The mean dose for the eye lens was 10.5 ± 3.3, 29.9 ± 8.6 and 34.2 ± 14.9 mGy and for the thyroid 1.7 ± 0.4, 2.4 ± 0.5 and 1.9 ± 0.4 mGy for Groups A, B and C, respectively. In vivo dosimetry using TLDs proved to be an efficient method. Gantry tilting and patient's set-up seem to significantly affect eye lens dose.
儿科脑部计算机断层扫描（CT）被认为是儿童中最常见的CT检查。本研究的目的是直接测量儿科患者在脑部CT检查期间皮肤、晶状体和甲状腺所接受的剂量。该研究纳入了35名接受脑部CT检查的儿科患者。这些患者被分为三个年龄组：A组（年龄范围：0.8 - 1岁）、B组（年龄范围：2.0 - 4.9岁）和C组（年龄范围：5.5 - 15.5岁）。热释光剂量计（TLD）被放置在眼睛、头部额叶区域、乳突和甲状腺上。A组、B组和C组的皮肤剂量分别为16.6±1.5、38.8±5.1和41.7±9.4毫戈瑞。A组、B组和C组晶状体的平均剂量分别为10.5±3.3、29.9±8.6和34.2±14.9毫戈瑞，甲状腺的平均剂量分别为1.7±0.4、2.4±0.5和1.9±0.4毫戈瑞。使用TLD进行体内剂量测定被证明是一种有效的方法。机架倾斜和患者体位似乎会显著影响晶状体剂量。
