Multipurpose Quality-Control Jig for Easily Calibrating Image-Guided Radiotherapy Apparatus

Technology #14933

Questions about this technology? Ask a Technology Manager

Download Printable PDF

Chihray Liu
Richard David Helmig
Guanghua Yan
Managed By
Zahara M. Jaffer
Assistant Director 352-392-8929
Patent Protection
US Patent 9,468,416

Check and Calibrate IGRT Equipment Using One Phantom Isocenter Device

This quality-control jig enables multiple Image-Guided radiotherapy (IGRT) calibration and performance monitoring procedures quickly and easily. The global radiotherapy market will have a value of $8.1 billion by 2019. Many radiation technicians use IGRT because it allows them to guide treatment directly to tumor tissue inside the patient’s body. IGRT comprises two instruments – a linac producing a radiation beam to destroy tumors and an imager producing low-energy radiation to create a 3D image of the treatment site – that must be routinely calibrated, a time-consuming and complicated task. Researchers at the University of Florida have developed a multipurpose calibration jig with an isocenter phantom that can monitor actual performance and tune the apparatus parameters conveniently and quickly. Unlike other quality-control methods available on the market today, technicians can use the jig to check a variety of different parameters.


Calibrating and monitoring performance of IGRT apparatuses


  • Designed for multipurpose use, including quality assurance checks for mechanic isocenter, radiation isocenter, imaging isocenter, couch height, laser and ODI device
  • Calibrates IGRT parameters and identifies faulty components, increasing apparatus performance and accuracy


This quality-control jig uses an isocenter phantom to test and calibrate multiple apparatus parameters. IGRT parameters – such as the mechanical and imaging isocenters (CBCT/KV/MV), couch and table height, size of the linear accelerator radiation field, adjustment parameters to account for component flexing, source-surface distance, optical parameters, and alignment of lasers in an operating room – can misalign with use. The jig includes a ball bearing and a three-axis positioner that locates the ball bearing in the radiation isocenter of the apparatus. Once the ball bearing is in place, technicians can perform other calibration procedures, identifying particular components for replacement or calibration. After calibration, the IGRT apparatus parameters could be within standard operating values. This would potentially allow radiation technicians to get predictable and repeatable results.