Observations on Real-Time Prostate Gland Motion Using Electromagnetic Tracking

To quantify and describe the real-time movement of the prostate gland in a large data set of patients treated with radiotherapy.The Calypso four-dimensional localization system was used for target localization in 17 patients, with electromagnetic markers implanted in the prostate of each patient. We analyzed a total of 550 continuous tracking sessions. The fraction of time that the prostate was displaced by >3, >5, >7, and >10 mm was calculated...