4D re-contouring

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Patient changes in anatomy and position can be accounted for by utilising 4D CT scans for radiation therapy planning. This is most commonly undertaken when treating tumours of the thorax. For gated treatment delivery, all phases of motion need to be planned, and therefore all normal and tumour anatomy needs to be contoured for all phases – often up to 12 phases for respiratory motion.

Oncology Systems Limited's OnQ rts® automatically re-contours normal and tumour anatomy on all phases based on the primary contoured phase. It also generates a cine loop, time average, MaxIP and MinIP from the 4D phase images. An ITV is automatically generated based on the MaxIP if a GTV/CTV is present on any phase.

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