Flat-panel Detector Calibration

Accurate delivery of radiotherapy dose is predicated upon careful motion management. This is particularly true for spot-scanned proton therapy. Our proton therapy vendor developed a stereoscopic kV X-ray image-guidance platform for this purpose. While it is engineered to a given specification, the actual positions of the components (e.g. flat-panel detectors) may contain small errors. This project delivers an iterative algorithmic calibration routine to correct such errors, i.e. translation, rotation and non-affine distortions. The main motivation behind this routine is to enable high-fidelity perspective overlays of RT structure sets in our in-house clinical software. It may also be used as an independent QA of vendor’s own calibrations.

Schematic 3D-2D calibration routine

Zheng Zhang
Research Fellow