Advanced Skills in Modern Radiotherapy 2018

3D (CBCT)

• Limitations ➢ Collision ➢

Field of view

➢

Increased dose to contra lateral breast

• CBCT not acquired at the isocentre to avoid collision

• Then once matched the shift includes the offset from isocentre position

• Adds time and potential errors

• Donovan et al. (2012) stipulate limitations on iso position to account for this