Physics Bucharest 2017

MV Fan Beam CT

Advantages • MV treatment beam used (reduced to 3.5MV for CT acquisition) • Slice thickness of 2,4 and 6mm • Fan beam with co-incident treatment and imaging iso-centres • No artefact from high density objects e.g. hip prosthesis Limitations • MV contrast • Slow image acquisition (5s per slice) • Image quality vs. dose? (1-3cGy) • Longitudinal artefacts from resp motion axis resolution?

Tomotherapy