Matthew C. Schmidt, PhD

Modern linear accelerators maintain precise control of delivery parameters during the treatment of dynamic external beam radiotherapy treatment plans; vendors provide snapshots of these parameters using trajectory log files (TLF). This project aims to investi...

To perform comprehensive dosimetric validation of a commercially available independent Monte Carlo (MC)-based secondary dose calculation engine for clinical photon radiotherapy.

To develop and validate a novel isocentricity test using continuous axis motion and imaging during beam delivery to characterize three-dimensional isocenter walkout.

Despite the global transition toward more precise and conformal radiotherapy, many countries currently treat with Co-60 units. This paper describes key steps, challenges and lessons learned from a successful transition from Co-60 to LINAC based radiotherapy i...

To Standardize multi-leaf collimator (MLC) leaf-end dosimetry by adjusting the physical MLC gap across multiple linacs within an enterprise.

This study investigates the feasibility of using two affordable optical surface–imaging technologies to generate detailed 3D maps of the treatment room and patient surface for detecting and mitigating potential collisions between the proton nozzle and the pat...

A novel, low-cost 3D surface scanning system was developed using a custom modification of the laser-profiling technique. Proof of concept was demonstrated through 3D simulation in Blender 3D software. A real-world prototype was then implemented using a consum...

Treatment planning system (TPS) beam modelling is identified as the largest cause of independent dosimetry audit failure. This study aims to develop and validate a universal beam model (UBM) specific to single-iso multi-target (SIMT) stereotactic radiosurgery...

To develop and validate a continuous two-dimensional output-factor (OF) model and to identify a measurement strategy that achieves accuracy and efficiency.

To extend MAAS-SFRThelper with geometry-based lattice positioning tools, completing an integrated workflow from sphere generation, positioning, and VMAT optimization, to dose evaluation for SFRT planning.

Independent verification of IROC phantom credentialing results is valuable for institutional quality assurance and confidence in treatment planning system performance. This work aimed to verify the accuracy of a commercially available Monte Carlo (MC) dose al...

Therapy Physics

For single-isocenter multi-target (SIMT) stereotactic radiosurgery (SRS), benchmarking, auditing and inter-institutional standardization of dose delivery remains challenging as it requires specialized equipment and expertise. Electronic portal imaging devices...