Image-guided radiation therapy (IGRT)

Also known as: GRT

Radiation oncologists use image-guided radiation therapy, or IGRT, to help better deliver the radiation to the cancer since tumors can move between treatments due to differences in organ filling or movements while breathing. IGRT involves conformal radiation treatment guided by imaging, such as CT, ultrasound or x-rays, taken in the treatment room on a daily basis just before the patient is given the radiation treatment. Organ motion is problematic when using radiation therapy to treat cancers such as lung and liver. 4D CT imaging (the four dimensions being width, height, depth and time) takes into account the movement of organs over time. This technology provides the radiation oncologist with far more precise information on tumor motion with which to plan and deliver radiation therapy. The information from the initial planning CT or 4D CT scan is transmitted to a computer in the treatment room to allow the radiation oncologist and radiation therapists to compare the planning CT image with the image taken just before treatment. During IGRT, the radiation oncologist compares these images to see if the treatment needs to be adjusted – this allows for better tumor targeting while avoiding nearby healthy tissue.

Providence Radiation Oncology Services offers a comprehensive approach to cancer care with a wide range of world-class cancer therapy modalities implemented by a multidisciplinary team of experts. Our extraordinary team, coupled with state-of-the-art technology, creates the environment for superior treatment outcomes for cancer patients.

Proprietary Health Article

Radiation Oncology Roundtable

Despite the fact that about a third of all cancer patients receive radiation therapy in some form, this invisible and painless procedure remains the least understood common cancer treatment. Providence Cancer Center News recently sat down with Christine Cha, M.D., Jeannie Louie, M.D., and Richard Rodriguez, R.T., to find out why radiation matters today.

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American Cancer Society

American Cancer Society’s home page with links to all types of cancer, symptoms, treatment options, statistics trials and ways to contribute.