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6 Impact of application parameters on isodose coverage of point a in cervix cancer brachytherapy
  1. Suryakanta Acharya
  1. Assam Cancer Care Foundation, Lakhimpur, India


Introduction/Background HDR Brachytherapy is an integral part of cervical cancer radiation treatment. This study was done to analyse type of dose distribution in HDR intracavitary Brachytherapy in carcinoma cervix patients and the factors affecting it, particularly ovoid separation.

Methodology Retrospective analysis of 29 cases of uterine cervix HDR brachytherapy was done. All HDR brachytherapy were ICRT, performed with analgesia & sedation. Various parameters like ovoid separation, dose to bladder and rectum points as specified in ICRU-38 were recorded. Distance between bladder point and rectum point was noted in each brachytherapy session. 100% isodose line with maximum separation both in AP and Lateral directions was recorded. All parameters were analysed with bi-variate analysis.

Results The study was done in 2023. All parameters recorded were co-related with the isodose coverage (AP & Lateral) and the most significant parameter affecting point A isodose distribution is inter-ovoid distance. Lateral isodose coverage increases with increase in ovoid separation up to approximately 25–30 mm, while AP isodose coverage remains constant throughout.

Conclusion Ovoid separation of 25–30 mm gives good isodose coverage of point A in cervical cancer HDR brachytherapy. Ovoid separation beyond that do not improve isodose coverage of point A, while increasing chances of vaginal injury.

Disclosures None.

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