ESTRO course on Image Guided Radiotherapy in Clinical Practice 2018

Established need for radiotherapy image guidance and adaptation

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

0

19

56

93

96

Bone

0

41

63

89

96

Soft tissue

52

89

96

100

100

8

Foroudi et al. Bladder cancer radiotherapy margins: a comparison of daily alignment using skin, bone or soft tissue 2012 Clin Oncol 24 673-681