1414 S.W. Eighth Ave.
Topeka, KS 66606

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(785) 354-5300

Cotton O’Neil Cancer Center

Imaging and Radiation Technology

The Linear Accelerator

The linear accelerator in the Cotton O’Neil Cancer Center is an Image-Guided Radiotherapy (IGRT) System. This system, known as the Trilogy, is a powerful image-guided radiation therapy system that delivers high-dose radiation to even the smallest tumors. The equipment can target an area as small as a pencil point, minimizing the damage to healthy tissue. It also delivers radiation doses more than 60 percent faster than conventional linear accelerators used to treat cancer, which means that patients can receive treatments in much less time.


The Cotton O’Neil Cancer Center had the first PET/CT in a 13-county region in northeast Kansas. PET stands for positron emission tomography. CT stands for computed tomography. With PET/CT capabilities, the equipment simultaneously images and combines the results of two state-of-the-art scanner technologies into a single exam: the highly sensitive PET scan picks up actively growing cancer cells, and the CT scan provides a detailed picture of the inside of your body to reveal the size and shape of abnormal cancerous growths. PET/CT is one of the most powerful tools in cancer diagnosis and staging.