Dia 1

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3D (CBCT)
• Provides:
 Isocentre position verification
 Internal soft tissue anatomy
 Clearer image of clips
 Information on changes in target during treatment
 Seroma changes
• Consider:
 Dose
 Increased dose to contralateral breast
 Field of view
 Filter (Varian Half bow tie) increases FOV in longitudinal direction
 Collision risk
 Donovan et al. (2012) stipulate limitations on iso position to account for
this
 Ease of accurate registration and match