Physics Bucharest 2017

6/3/2017

Treatment plan comparison for an abdominal lesion – 7 coplanar equi-spaced beams versus 5 non-coplanar beams

While non-co-planar beams do offer improvement in dose distributions, Delivery times with standard linacs needs to be considered

7 equi-spaced coplanar beams

Solid lines: 7 coplanarequi-space d beams Dashed lines: 5 optimized beams

5 non-coplanar beams

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Courtesy of Uwe Oelfke

The inverse problem

Factors Affecting Optimization Results

 Number of beams

 Beam orientation

 Optimization parameter and dose constraints

 Experience is gold!  Planning studies are a good way of gaining experience. Experience can be fed into “Class solutions” or automated planning  Optimization algorithm and objective function

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