St. Joseph Hospital of Orange
1100 West Stewart Dr, Orange, CA 92868714.633.9111
About Us News Room Careers Contact Us
Find St. Joseph Hospital Services Our Doctors Our Services For Patients For Visitors For Community
Radiation Oncology

Image Guided Radiation Therapy (IGRT)

During radiation therapy, either the patient or the internal organs may move, causing a risk of missing the tumor. Additionally, patients may lose weight while in therapy, which can alter the radiation dose.

Image-guided radiation therapy, when combined with intensity modulated radiation therapy, helps the radiation oncology experts at The Center for Cancer Prevention and Treatment properly account for changes as small as 2mm, enabling them to deliver radiation with pinpoint precision. IGRT technology is performed using cone beam CT (3D image of the patient) to verify the treatment area and the tumor location.

Metal markers are inserted into the prostate and are visible on a CT scan. This is the planning image used to record the location of markers to ensure proper location of treatment.





Additional X-rays are taken prior to treatment to verify the position of the markers relative to the planning image. Verification images ensure pinpoint treatment accuracy.

These detailed images allow the radiation oncology team to see the exact location and shape of the tumor once the patient is on the treatment table. This means that the patient (and, most importantly, the tumor) is in the exact position necessary and remains in the same position throughout the treatment.

The sophisticated technical capabilities provided by IGRT and cone beam CT enable our clinical experts to deliver high-quality radiation, contributing to superior clinical outcomes and improved quality of life for patients.