Physics Bucharest 2017

2-D Verification

• Visualisation of bony anatomy, some soft tissue, implanted radio-opaque markers. • Only suitable for tumours closely related to bony anatomy and/or restricted tumour movement. • Used for • QA: Measurement of beam shape • In vivo dosimetry • Orthogonal portal images acquired at cardinal angles allow field placement assessment in 3 directions: • AP for LR and SI displacement; • LAT for AP and SI displacement. • It may be necessary to produce fields for imaging purposes only.