What is cone beam computed tomography for cancer radiation treatment?

Cone beam computed tomography (CBCT or cone beam CT) involves the use of a CT scanner built into the linear accelerator. Images taken just prior to radiation treatment allow the radiation oncologist to correct any variation between intended and actual setup position. CT is anatomically more detailed than x-rays -- and sometimes cone beam CT is used instead of x-ray imaging when extreme precision of treatment is needed.

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