Multi-Leaf Collimator Status Monitoring Based on Geometric Constraint of Strip Type Detector

This study presents an algorithm for multi-Leaf collimator status using photon signals acquired from a strip type detector. The multi-leaf collimator is rotated from 0 to 180 degrees in 10-degree increments, and at each angle, photon signals are captured and digitized using an analog-to-digital converter. The data is processed with a filtered back projection technique combined with two categories masks to improve and verify the reconstruction accuracy. A preliminary result shows the algorithm offering a reliable solution for verifying multi-leaf collimator configurations in radiation therapy. Meanwhile, the mask type will affect the reconstructed images and we found that the strip type detector could effectively detect and reconstruct the photon signals as well.