944-945 / 3107
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
Tomotherapy
prosthesis
Limitations
• MV contrast
• Slow image acquisition (5s per slice)
• Image quality vs. dose? (1-3cGy)
• Longitudinal
axis resolution?