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By computing the score for a set of candidate directions, the ideal irradiation angle for
target voxel i is defined as the direction with the minimum score.
OAR
Targe
t OAR
Normal
Tissue
D
NT
D
NT
D
Target
D
OAR
Target
voxel
i
Direction j
Distance along
ray
Dose
Beam angle optimization with a patient specific score for every
target voxel…
Courtesy of Uwe Oelfke
41
Treatment plan comparison for a prostate lesion –
9 coplanar equi-spaced beams versus 9 non-coplanar
beams
■
9 coplanarequi-spaced
beams
■
9 optimized beams
Courtesy of Uwe Oelfke
42