Physics Bucharest 2017
Established need for image guidance
Retrospective analysis of 27 patients having daily CBCT
To determine CTV to PTV margin required to achieve coverage of bladder when using skin, bone or soft tissue matching
% of patients where expanded CTV covered 95% of wall displacements
CTV+0.5 CTV+1.0 CTV+1.5 CTV+2.0 CTV+2.5
Skin Bone
0 0
19 41 89
56 63 96
93 89
96 96
Soft tissue 52
100
100
Foroudi et al. Bladder cancer radiotherapy margins: a comparison of daily alignment using skin, bone or soft tissue 2012 Clin Oncol 24 673-681
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