Abstract # 2924 The use of Cone beam CT Based Three-dimensional Planning in Intracavitary Brachytherapy for Cervical Cancer

Presenter: Al-Halabi, Hani

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About the Presenter:
Introduction Intracavitary Brachytherapy (ICBT) has an essential role in the definitive radiotherapy management of cervical cancer. Traditionally, ICBT is planned using conventional 2D orthogonal films. Dose prescription to point A and reporting the International Commission on Radiation Units and Measurements (ICRU) bladder and rectum maximal point doses is routinely done. Studies of three-dimensional ICBT planning using CT and MRI demonstrated that the ICRU bladder and rectum doses may in fact underestimate the true maximal doses to these organs. This explains the poor correlation between the reported ICRU doses and late treatment complications.3D Volumetric Based ICBT Planning allows better visualisation of the target and OAR. It also allows shaping of the spatial dose distribution to conform to the target volume and reduce the dose to normal tissues. With this approach, it is possible to escalate the dose to the tumor producing greater rates of local control without increasing normal tissue toxicity, thus increasing the therapeutic window of ICBT. Cone beam CT (CBCT) imaging offers a convenient alternative to CT. The ability to perform CBCT scans intra-operatively, with the patient in the treatment position and not having to transfer them to a CT scanner first brought our interest in studying this modality in ICBT planning.

H. Al-Halabi1, L. Portelance1, M. Duclos1, B. Reniers1, M. Bloemers1, B. Bahoric2, T. Niazi2, L. Souhami1, 1McGill University Health Center, Montreal, QC, Canada, 2Jewish General Hospital, Montreal, QC, Canada

Author Disclosure:
 H. Al-Halabi, None; L. Portelance, None; M. Duclos, None; B. Reniers, None; M. Bloemers, None; B. Bahoric, None; T. Niazi, None; L. Souhami, None.

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