Targeting Prostate Cancer - the Calypso® System
Organ Motion and Radiation Therapy
Organ motion can be a significant barrier to delivering accurate external beam radiation therapy to the prostate. Virginia Mason offers an advanced system to deliver radiation only to the prescribed target. Our Comprehensive Prostate Cancer Clinic, part of the Floyd & Delores Jones Cancer Institute at Virginia Mason in Seattle, is the second cancer treatment facility in the Pacific Northwest to install the Calypso® 4D Localization System to target prostate cancer.
About the Calypso System
The Calypso 4D Localization System is different from other methods to prepare you for radiation treatment. The Calypso System uses radiofrequency waves that allow very accurate alignment of your prostate before each treatment session and at all times during treatment delivery.
The Calypso System significantly improves the ability to target radiation only to your tumor, avoiding unnecessary radiation to healthy tissues such as the bladder and rectum.
The Calypso localization and tracking system works with three Beacon® transponders, wireless electromagnetic circuits about the size of a grain of rice, that are implanted in the prostate. The Calypso System works with the transponders to:
- Locate the tumor's position
- Guide the therapist to set up the treatment continuously through radiation therapy
- Tailor treatment delivery to trigger the beam on
and off to ensure the tumor is accurately aligned throughout the
A Beacon® transponder
How it Works
1. In an outpatient procedure, like a biopsy, three tiny Beacon®
electromagnetic transponders are implanted into your prostate. Each is about as
small as a grain of rice.
Transponders placed in prostate
2. The transponders communicate with the Calypso System using safe radiofrequency waves
Calypso System communicating with transponders
3. Your prostate is monitored during treatment, showing exactly where the tumor is all the time so important decisions about your care can be made.
For More Information
For more information about use of the Calypso System for targeted radiation
therapy for prostate cancer treatment, please talk with your physician or
contact Virginia Mason's Section of Radiation Oncology at (206)