近距离放疗时不同直肠膀胱体积的受照剂量比较

The exposure dose comparison of different rectal bladder volume dose comparison with brachytherapy

目的:探讨宫颈癌腔内放疗时不同直肠膀胱体积与受照剂量的关系。方法:选取宫颈癌患者共24例,给予腔内近距离后装治疗,处方剂量予A点6GY,用DVH评价标准计划下直肠膀胱体积与受照剂量的关系。结果:比较D0.1cc、D2cc剂量,直肠体积>30cc组比≤30cc组受照受照剂量剂量高,P<0.05,有统计学意义。比较D0.1cc、D2cc剂量,膀胱体积>200cc组比<60cc组受照剂量高,P<0.05,有统计学意义。结论:宫颈癌近距离放疗保持适当的膀胱体积,保持直肠排空,可以避免其受到高剂量照射。

Objective, To study the relationship between different rectal bladder volume and dosa- ges in intracavitary brachytherapy for cervical cancer. Methods. Twenty-four patients with cervical cancer were treated with high-dose rate brachytherapy and. dosage for point A was 6GY, and relationship between the rectal bladder volume and exposure dosage were calculated with DVH. Results, DO. 1 cc, D2cc dosage were higher when rectum volume 〉30 cc than those with rectum volume≤30 cc group （P〈0.05） DO. 1 cc.D2cc dosage were also higher when bladder volume 〉200 cc than those with bladder volume 〈60 cc group （P〈0.05）. Conclusion. Appropriate bladder volume, and empty rectal space can avoid exposure ofradiotherapy in cervical cancer that were treated with intracavitary brachytherapy.