Dose protection of testis with low melting point lead during postoperative radiotherapy for stage Ⅰ-Ⅱ B testicular seminoma
10.3760/cma.j.issn.0254-5098.2018.02.006
- VernacularTitle:Ⅰ～ⅡB期精原细胞瘤术后放疗中不同厚度低熔点挡铅对睾丸剂量防护的研究
- Author:
Liming YAN
1
;
Gang ZHOU
;
Liesong CHEN
;
Li ZOU
;
Yanze SUN
;
Ye TIAN
Author Information
1. 215004,苏州大学附属第二医院放疗科苏州大学放射肿瘤治疗学研究所
- Keywords:
Radiotherapy;
Seminoma;
Testicular dose;
Protection;
Fertility
- From:
Chinese Journal of Radiological Medicine and Protection
2018;38(2):110-114
- CountryChina
- Language:Chinese
-
Abstract:
Objective To assess the protective effect of low melting point lead and field margin on the opposite testicular in testicular seminoma patients during postoperative radiation.Methods A patient with stage Ⅰ seminoma was selected and his phantom measurement was carried out.The PTW 0.6 cm3 type ionization chamber was used to measure the absorbed dose under the conditions of no lead and low melting point lead with thickness of 3,5,7,10 and 15 mm at different distances from the field edge,respectively.Results Under different lead thickness conditions,the measurement result and the distance between the measured points and the boundary of the field were exponentially attenuated.The relative target dose dropped from 8.41％ at 1 cm to 0.61％ at 25 cm without lead blocking,and dropped from 4.55％,3.98％ and 3.47％ at 1 cm to0.27％,0.21％ and0.17％ at 25 cm with 3,5,7 cmlead,respectively.With 10 mm lead,it dropped from 2.55％ at 1.5 cm to0.15％ at25 cm,and 1.86％ at2 cm to0.13％ at 25 cm with 15 mm lead.The lead shield of 3,7 and 15 mm thickness can be used to reduce the scatter dose of testis to below 0.5 Gy during radiotherapy for seminoma.Conclusions An appropriate thickness of low melting point lead might reduce the dose of testis conveniently and effectively,which would be beneficial to protect the fertility of the patients with testicular seminoma.
