Comparison of Planned and In-Vivo Measured Rectal Dose during Intracavitory Hdr Co60 Brachytherapy in Cervical Cancer.
Journal Title: International Journal of Medical Science and Innovative Research (IJMSIR) - Year 2019, Vol 4, Issue 1
Abstract
Background: The use of Co-60 as source for HDR brachytherapy poses a question on whether the rectum will receive higher radiation dose due to the relatively higher average gamma energy of 1.25 MeV. In vivo dosimetry, where dosimeters are placed in or on the patient, is one way of verifying the dose.purpose of this study to measure rectal dose during treatment and compare between calculated by tps and measured by Diode. Material and method: 50 patients of carcinoma cervix were included in this study during last two years. Intracavitary brachytherapy FLETCHER SUIT applicator was inserted.An amorphous silicon diode which encapsulated with rubber was inserted into rectum. Relation between diode and rectal wall was explained very well .Images which obtained by C-arm transferd to treatment planning system which calculated rectal dose. After treatment dose measured by diode and calculated by TPS were compared. Results: Mean dose as per TPS and Diode Calculation 4.43Gy and 4.56 Gy respectively. 95% Confidence interval limit for TPS 4.43 +/- 3 and for diode is 4.56 +/- 3.32. As observed from table the dose measured using diode is higher than that by TPS , but it is not statistically significant(P<0.69) as per Mann –Whitney U test. There was a observable difference between both doses but it was not significant. Conclusion: Hence it can be summarized from our study that there is a difference between the TPS and the in vivo dosimetry ,but this difference is not statistically significant(p value >.05). In vivodosimetry is beneficial for an individual patient.
Authors and Affiliations
Dr Abhishek Sharma
Keywords
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