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Contrast and Artefacts

IV contrast may be used during CT for head

and neck patients. This must be accounted for

when planning.

Create a volume which covers any contrast in

and around the treatment area.

Remove areas of bone, lung, airways from

this.

Give unit density of 1 to the contrast in this

region

If necessary, use a similar technique to

remove artefact caused by dental filling or

other high density regions, eg shunts