Effective dose estimation for pediatric voiding cystourethrography using an anthropomorphic phantom set and metal oxide semiconductor field-effect transistor (MOSFET) technology
Effective dose estimation for pediatric voiding cystourethrography using an anthropomorphic phantom set and metal oxide semiconductor field-effect transistor (MOSFET) technology
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DOI：
10.1007/s00247-009-1161-5
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发表时间：
2009-06-01
影响因子：
2.3
通讯作者：
Gordon, Christopher L.
中科院分区：
文献类型：
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作者：
Lee, Ryan;Thomas, Karen E.;Gordon, Christopher L.
儿童与辐射照射有关的风险高于成人。因此，在常规儿科检查中，如排尿性膀胱尿道造影（VCUG）中使用荧光透视需要准确确定相关有效剂量。为了估计使用拟人模型和金属氧化物半导体场效应晶体管（MOSFET）在10岁以下儿童中进行VCUG检查的有效剂量，将MOSFET放置在代表10岁儿童的四个幻影中，在对应于辐射敏感器官的位置，并暴露于模拟VCUG（5分钟荧光透视，50点暴露）以使测量误差最小化。测量有效剂量，并根据患者日志确定标准化临床VCUG（1分钟荧光透视，5点曝光）。进行蒙特卡罗模拟以评估测量的有效剂量的准确性。将每个VCUG的剂量面积积（DAP）与有效剂量进行比较，有效剂量范围为0.10 - 0.55 mSv，随年龄增长而增加，女孩的剂量更高。透视检查占总有效剂量的88-90%，点照射占10- 12%。MEMET测量的和模拟得出的有效剂量相当（T > 0.12）。DAP与男女有效剂量密切相关（r（2）> 0.97，P < 0.0001）。在10岁以下儿童中进行VCUG检查的有效剂量为千分之一，但不可忽略。
The risks associated with radiation exposure are higher in children than in adults. Therefore the use of fluoroscopy in common pediatric examinations such as voiding cystourethrography (VCUG) requires accurate determination of the associated effective dose.To estimate effective dose for VCUG examinations performed in children younger than 10 years using anthropomorphic phantoms and metal oxide semiconductor field-effect transistor (MOSFET) dosimeters.MOSFETs were placed within four phantoms representing children a parts per thousand currency sign10 years old, at locations corresponding to radiosensitive organs, and exposed to a mock VCUG (5 min of fluoroscopy, 50 spot exposures) to minimize measurement error. Effective dose was measured and scaled to a standardized clinical VCUG (1 min fluoroscopy, 5 spot exposures) determined from patient logs. Monte Carlo simulations were performed to assess the accuracy of the measured effective dose. The dose area product (DAP) from each VCUG was compared to the effective dose.Effective doses ranged from 0.10 to 0.55 mSv, increased with age, and were higher in girls. Fluoroscopy accounted for 88-90% of the total effective dose, and spot exposures 10-12%. MOSFET-measured and simulation-derived effective doses were comparable (T > 0.12). DAP was strongly correlated with effective dose for both genders (r (2)> 0.97, P < 0.0001).Effective doses for VCUG examinations performed in children a parts per thousand currency sign10 years of age are low but not negligible.