Seminar Thursday July 28 – William Davis

Speaker: William Davis
Location: Physics 175
Time: 3:30, July 28, 2015

Characterization and Study of a Medical Linear Accelerator Mounted Mini-Beam Collimator

Abstract: Conventional external beam radiotherapy makes use of uniform beams to deliver a dose of radiation.  This method has proven effective in the treatment of many cancers, but unavoidably deposits dose in healthy tissue as well.  Spatial fractionation techniques seek to minimize the damage to healthy tissue caused by the radiation beam.  Mini-beam radiotherapy is a method of spatial fractionation which makes use of an array of parallel planar beams.  A group at the Saskatchewan Cancer Agency have developed a mini-beam collimator for use with a medical linear accelerator operated at a nominal energy of 6MV.
Various attributes of the mini-beam collimated beam are under study at the Saskatoon Cancer Centre.   The dose distribution and its consistency across a set of medical linear accelerators have been measured and simulated.  Variations in dose due to accelerator settings are being characterized.  The effect of mini-beam irradiation on cells is currently being examined.

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