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Ogden Regional Medical Center
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mins

How TomoTherapy Works

photo of tomotherapy machine

360° delivery

Conventional machine design allows radiation to be delivered from only a few directions. The Hi-Art treatment system's linear accelerator (linac) is mounted to a CT scanner-like ring gantry, which means TomoTherapy treatments can be delivered continuously, from all angles around the patient. More beam directions give physicians more control in how they plan treatments – and more assurance that dose will be confined to the tumor, reducing the risk of short- and long-term side effects.

Thousands of targeted beamlets

The Hi-Art treatment system uses a patented multi-leaf collimator (MLC) that divides the radiation beam into beamlets, all aimed at the tumor. Typically, tens of thousands of beamlets are used in a single TomoTherapy treatment session. Powerful software optimizes the contribution of each one to the total tumor dose, minimizing exposure to healthy tissue.

CTrue™ image guidance for every patient, every day™

Our unique ring gantry design facilitates a 360° delivery pattern. Perhaps even more importantly, it integrates true CT imaging that can be used on a daily basis to guide the accurate delivery of each treatment session. No other radiation therapy machine offers this seamless integration of image-guided and intensity-modulated radiation therapy. No other machine can.

The Tomo® Process

The TomoTherapy® Hi-Art® system introduces a new, integrated way to deliver radiation treatments for cancer. The process makes it easier on clinicians and patients alike.

Planning

Before beginning a TomoTherapy treatment, the doctor uses 3D images from a combination of scanning technologies (such as CT and MRI) and special software to establish the precise contours for each treatment volume (tumor) and any regions at risk (sensitive organs or structures). The doctor then decides how much radiation the tumor should receive, as well as acceptable levels for surrounding structures. The Hi-Art treatment system calculates the appropriate pattern, position and intensity of the radiation beam to be delivered, to match the doctor's prescription as closely as possible.

Patient positioning

As both a treatment delivery machine and a CT scanner, the Hi-Art system allows doctors to take a CT scan just before each treatment. With the scan, they can verify the position of the tumor and, if necessary, adjust the patient's position to help make sure radiation is directed right where it should be.

Continuous 360° treatment delivery

The Hi-Art treatment system delivers intensity-modulated radiation therapy (IMRT) with a helical (spiral) delivery pattern. Photon radiation is produced by a linear accelerator (or linac for short), which travels in multiple circles around the patient and moves in unison with a device called a multi-leaf collimator, or MLC. Meanwhile, the couch is also moving–guiding the patient slowly through the center of the ring. Each time the linac makes a loop around the patient it directs a unique, optimized set of radiation beamlets at the tumor. Quite literally, the Tomo process runs rings around cancer!