Related Experiment Video
Updated: Aug 12, 2026
Stereotactic Radiosurgery for Gynecologic Cancer
Published on: April 17, 2012
A real-time image-guided intraoperative high-dose-rate brachytherapy system
Shidong Li1, Deborah Frassica, Theodore DeWeese
1Department of Radiation Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD 21231, USA. lish@jhmi.edu
Purpose:
To develop a real-time, image-guided intraoperative high-dose-rate brachytherapy system.
Methods And Materials:
The surface applicator, a catheter array on a 1-mm-thick soft and semitransparent silicone rubber sheet, was directly sutured on the surgical bed. A three-dimensional video camera was then used to instantly capture images of the catheters and the surgical surface. Tracing the catheters on the images allowed us to automatically determine the dwell source positions. Dwell times in the dwell positions were optimized to minimize the dose variation and deviation from the treatment prescription. A dose-texture plot was created to quantify the dose distribution.
Results:
Treatment planning time was reduced from hours to a few minutes. Phantom tests have shown that the new source localization is accurate with sigma<1.5 mm. All hot spots and cold spots had been eliminated after the dwell-time optimization.
Conclusions:
This real-time, image-guided planning system can provide optimal image-guided intraoperative high-dose-rate brachytherapy with geometric and dosimetric improvements and a short planning time.
