CT引导下125I粒子植入对相关医务人员的辐射剂量评估

目的评估CT引导下125I粒子植入过程中相关医务人员在不同距离及有无辐射防护措施下的周围剂量当量率。方法125I粒子植入后立即使用多功能射线检测仪测量50例125I粒子植入患者距粒子植入部位体表不同垂直距离（5 cm、10 cm、1 m、2 m和3 m）及有无防护措施条件下的周围剂量当量率，评估医务人员受到的辐射剂量。组间比较采用单因素方差分析。结果距离粒子植入部位体表垂直距离为5 cm、10 cm、1 m、2 m和3 m处的周围剂量当量率分别为（1091.75±10.53）、（1055.50±31.68）、（123.45±20.83）、（20.95±6.10）和（7.78±3.24）μSv/h。0.5 mm铅当量铅衣屏蔽后5 cm、10 cm、1 m、2 m和3 m处的周围剂量当量率分别为（1.36±2.03）、（0.97±1.48）、（0.46±0.63）、（0.29±0.34）和（0.14±0.12）μSv/h。屏蔽前后周围剂量当量率的差异均有统计学意义（F=183.718、71.202、217.411、184.169、108.222，均P < 0.05）。结论CT引导下125I粒子植入过程中相关医务人员采取适当的距离防护及穿戴个人防护用品可以大大降低125I粒子带来的辐射影响。

Radiation dosage assessment of CT guided implantation of 125I seeds for medical personnel

ObjectiveThis study was conducted to assess the dosage of radiation associated with CT guided implantation of 125I seeds in medical personnel at different distances with or without radiation protection.MethodsAmbient dose equivalent was measured by gamma ray radiation detector after implantation of 125I seeds with or without protection at different distances(5 cm, 10 cm, 1 m, 2 m, and 3 m) into 50 patients. Radiation dose received by medical personnel was assessed.ResultsThe ambient dose equivalents were(1091.75±10.53), (1055.50±31.68), (123.45±20.83), (20.95±6.10), and(7.78±3.24) μSv/h in 5 cm, 10 cm, 1 m, 2 m, and 3 m. The ambient dose equivalents were(1.36±2.03), (0.97±1.48), (0.46±0.63), (0.29±0.34), and(0.14±0.12) μSv/h with 0.5 mmPb lead clothes at distances of 5 cm, 10 cm, 1 m, 2 m, and 3 m. The ambient dose equivalent was statistically significant with or without 0.5 mm Pb lead clothes (F=183.718, 71.202, 217.411, 184.169, 108.222, all P < 0.05).ConclusionsMedical personnel should take appropriate distance protection during 125I seeds implantation. Ambient dose equivalent can be significantly reduced by wearing 0.5 mmPb lead clothes.