Journal of Medical Physics
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Year : 1990  |  Volume : 15  |  Issue : 1  |  Page : 5-10

Volume Analysis In The Treatment Of Carcinoma Of The Cervix With Radiation

Correspondence Address:
T Ganesh

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Source of Support: None, Conflict of Interest: None

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Intracavitary radiation therapy is an integral part of any radical radiation protocol in the management of the carcinoma of the cervix. In the present study, 142 patients of carcinoma of. the cervix (FIGO stage II and Ill), treated between June 1957 and August 1989 were selected. In all the patients intracavitary caesium application using the Selectron standard applicator was performed following initial external irradiation. A computerized dosimetry using Nucletron Planning System (NPS) was done in accordance with the ICRU 38 guidelines. The reference volume enclosed by the 60 G isodose level was calculated using the formula 3 HWT and also by Volume Dose Rate Table (VDRT) option available with the NPS. The calculation of reference volume by VDRT method is found to be more accurate compared to the 3 HWT method as the latter tends to underestimate the volume, since it is dependent on certain factors, especially poor source geometry, leading towards inaccuracy. This relationship however, needs further explanation to arrive at certain definitive conclusion.

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