Medical Physics Seminar - Monday, September 21, 2009

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The Development of a Stereotactic Radiosurgery System for Helical Tomotherapy

Emilie T. Soisson, MS, CMD

Radiation Oncology

Department of Medical Physics

McGill University Health Centre

Montreal, CANADA

Currently, at the University of Wisconsin-Madison, a Varian linear accelerator, equipped with circular collimators and a floorstand, is used for stereotactic radiosurgery (SRS) delivery. In the interest of providing a more efficient delivery option for patients with multiple brain metastases, a Tomotherapy-based radiosurgery program is under development to serve as an intensity modulated radiosurgery compliment to our existing delivery method. Instead of using a patient-frame based coordinate system for stereotactic localization, the units own on board MVCT can be used to precisely locate the target at the time of treatment. A Tomotherapy-specific treatment planning technique has been developed using the TomoTherapy treatment planning system (TPS) that reliably produces plans with conformal target coverage and steep dose fall off peripheral to the target. Tomotherapy plans have been compared to conventional linac-based plans for both the treatment of brain metastases and ateriovenous malformations in terms of both target conformity and dose to normal brain. In addition, the impact of future product developments on the accuracy and efficiency of Tomotherapy-based radiosurgery has been investigated.

Location: 1345 Health Sciences Learning Center (HSLC)

Time:  4:00pm-5:00pm

Refreshments will be provided prior to the talk

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