Accurate delivery of external beam radiation therapy relies on localization of the treatment
target. Real-time electromagnetic localization systems (ELS) provide real-time tracking of the …

Results Good localization agreement (< 2 mm) was observed between the electromagnetic
system and the on-board X-ray imaging system in non-simultaneous comparisons. The …

Purpose: To evaluate use of a real‐time tracking system to determine intrafraction prostate
motion and isocenter offset. Method and Materials: Calypso® 4D Localization System …

Results The system's capability to localize transponders in a Rondo phantom has been
evaluated under normal treatment conditions using a Varian 23EX linear accelerator. The …

Results No complications of beacon implantation were observed. After setup to external skin
marks, beacon localization was performed and the isocenter was shifted according to …

PURPOSE: Using real-time electromagnetic (EM) transponder tracking data recorded by the
Calypso 4D Localization System, we report inter-and intrafractional target motion of the …

Purpose: The Calypso 4D Localization System is being developed to provide accurate,
precise, objective, and continuous target localization during radiotherapy. This study …

Results A total of 1,027 comparisons among 41 patients at 5 different institutions were
evaluated in this study. The average differences in the lateral, longitudinal, and vertical …

Purpose Our purpose was to assess the ability of electromagnetic transponders (EMTs) to
localize and track movements in patients with prostate cancer (PCa) with metallic hip …

OBJECTIVES METHODS Inter-and intra-fraction motion of the prostate is a well-known
phenomenon that has to be corrected for accurate target localization in prostate cancer …