Journal of Medical Physics
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Year : 2000  |  Volume : 25  |  Issue : 4  |  Page : 242-246

Bladder And Rectal Doses From MDR Intracavitary Radiotherapy For Cervical Carcinoma

Correspondence Address:
D.S Soejoko

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Source of Support: None, Conflict of Interest: None

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38 applications of MDR intracavitary radiotherapy using I3'cs were performed for the treatment of 18 cervical carcinoma patients at stages I, II and Ill. Prior to the intracavitary therapy, each patient had been treated with 60 Co external therapy using two opposing fields to deliver dose of 46 - 50 Gy at the pelvic area. The applicators used in the intracavitary therapy was the Fletcher Suit Delcos with 3 or 4 sources in the tandem and one source in each ovoid. Reference points were determined using AP and lateral radiographs according to ICRU Report 38. The bladder reference point was defined by the radiographs of empty bladder with Foley baloon field with radio opaque fluid, whereas the rectal reference points Ri, Rq, R3 and R4 were determined from the inserted rectal marker. The reference dose was defined as the dose at point A or at the bulk tumour, and prescribed at about 850 cGy per application. The analysis of the bladder and rectal doses showed the doses at these two organs were (63 + 17%) and (92 + 25%) of point A dose, respectively. The rectal area dose determined as the average dose at points R1, R2, R3, and R4, had the value of (74 + 14%) of point A dose. The conclusion is that the bladder and rectum receive relatively high doses in the intracavitary therapy; therefore the dose at these two organs should be considered in the dose optimization.

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