Our Team
Theodore Geoghegan, PhD
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Education |
- Medical Physics Residency, University of California, San Francisco, Department of Radiation Oncology (2023-2025)
- Ph.D. in Biomedical Engineering, University of Iowa, Iowa City, IA (2023)
- M.S. in Medical Physics, San Diego State University, San Diego, CA (2018)
- B.S. in Applied Physics, University of California, Santa Cruz, CA (2015)
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Selected Publications, Abstracts and Posters |
- Hyer D, Caster J, Smith B, St-Aubin J, Snyder J, Shepard A, Zhang H, Mullan S, Geoghegan T, George B, Byrne J, Smith M, Buatti J, Sonka M. A technique to enable efficient adaptive radiation therapy: Automated contouring of prostate and adjacent organs. Advances in Radiation Oncology 101336. August 2023
- Geoghegan T, Patwardhan K, Ying Q, Nelson N, Yu J, Hill P, Gutierrez A, Flynn R, Hyer D. Design, testing and characterization of a proton central axis alignment device for the Dynamic Collimation System. Biomedical Physics & Engineering Express, Vol 9 (4) 045024. June 2023
- Nelson N, Culberson W, Hyer D, Geoghegan T, Patwardhan K, Smith B, Flynn R, Yu J, Gutierrez A, Hill P. Dosimetric validation of dynamically collimated pencil beam scanning proton therapy. Physics in Medicine and Biology, Vol 68 (5) 055003. February 2023.
- Geoghegan T, Patwardhan K, Nelson N, Hill P, Flynn R, Smith B, Hyer D. Mechanical characterization and validation of the Dynamic Collimation System prototype for proton radiotherapy. Journal of Medical Devices, Vol. 16 (2). June 2022
- Smith B, Nelson N, Geoghegan T, Patwardhan K, Hill P, Yu J, Gutierrez A, Allen B, Hyer D. The dosimetric enhancement of GRID profiles using an external collimator in pencil beam scanning proton therapy. Medical Physics, Vol 49 (4). April 2022
- Nelson N, Culberson W, Hyer D, Geoghegan T, Patwardhan K, Smith B, Flynn R, Yu J, Rana S, Gutierrez A, Hill P. Development and validation of the Dynamic Collimation Monte Carlo simulation package for pencil beam scanning proton therapy. Medical Physics, Vol. 48 (6). June 2021
- Hyer D, Bennett L, Geoghegan T, Bues M, Smith B. Innovations and the use of collimators in the delivery of pencil beam scanning proton therapy. International Journal of Particle Therapy, Vol. 8 (1). 2021
- Moreno-Barbosa F, de Celis-Alonso B, Moreno-Barbosa E, Miguel Hernandez-Lopez J, Geoghegan T, Ramos-Mendez J. Monte Carlo simulation of the effect of magnetic fields on brachytherapy dose distributions in lung tissue material. PLOS One, Vol. 15 (10). Oct. 2020
- Geoghegan T, Patwardhan K, Smith B, Flynn R, Yu J, Gutierrez A, Hyer D. Design of a focused collimator for proton therapy spot scanning using Monte Carlo methods. Medical Physics, Vol. 47 (7). July 2020
- Piersimoni P, Ramos-Mendez J, Geoghegan T, Bashkirov V, Schulte R, Faddegon B. The effect of beam purity and scanner complexity on proton CT accuracy. Medical Physics, Vol. 44 (1). Jan. 2017
- Sadrozinski H F-W , Geoghegan T, Harvey E, Johnson R, Plautz T, Zatserklyaniy A, Bashkirov V, Hurley R, Piersimoni P, Schulte R, Karbasi P, Schubert K, Schultze B, Giacometti V. Operation of the preclinical head scanner for proton CT. Nuclear Instruments and Methods in Physics Research Section A., Vol. 831. Sept. 2016
- Geoghegan T, Patwardhan K, Bennett L, Yu J, Gutierrez A, Hill P, Flynn R, Hyer D. Attachment Reproducibility of the Accessory Tray-Mounted Proton Dynamic Collimation System. Medical Physics, Vol. 49 (6). June 2022
- Geoghegan T, Patwardhan K, Nelson N, Bennett L, Yu J, Gutierrez A, Hill P, Flynn R, Hyer D. Characterization of An Isocenter Alignment Device for the Proton PBS Dynamic Collimation System. Medical Physics, Vol. 49 (6). June 2022
- Nelson N, Culberson W, Hyer D, Geoghegan T, Patwardhan K, Smith B, Flynn R, Yu J, Gutierrez A, Hill P. Dosimetric Delivery Validation of Dynamically Collimated Pencil Beam Scanning Proton Therapy. Medical Physics, Vol. 49 (6). June 2022
- Bennett L, K. Erhart, Nelson N, Yu J, Gutierrez A, S. Rana, Smith B, Hill P, Hyer D, Geoghegan T, Patwardhan K, Culberson W, Flynn R. Dose Calibration and Integral Depth Dose Correction of An Analytical Dose Calculation Algorithm for Collimated Pencil Beam Scanning Proton Therapy. Medical Physics, Vol. 49 (6). June 2022
- Nelson N, Culberson W, Hyer D, Bennett L, Geoghegan T, Patwardhan K, Smith B, Flynn R, Yu J, Gutierrez A, Hill P. Investigating Dosimetry for Individual Proton Beamlets. Medical Physics, Vol. 49 (6). June 2022
- Bennett L, Erhart K, Nelson N, Yu J, Gutierrez A, Rana S, Smith B, Hill P, Hyer D, Geoghegan T, Patwardhan K, Culberson W, Flynn R. Tuning An Analytical Proton Therapy Dose Calculation Algorithm for Penumbra Agreement in Collimated Pencil Beam Scanning Proton Therapy. Medical Physics, Vol. 49 (6). June 2022
- Patwardhan K, Geoghegan T, Flynn R, Hyer D. Autocalibration of Linear Positioners in a Dynamic Collimation System for Pencil Beam Scanning Proton Therapy. Medical Physics, Vol. 49 (6). June 2022
- Nelson N, Culberson W, Hyer D, Geoghegan T, Patwardhan K, Smith B, Flynn R, Yu J, Rana S, Gutierrez A, Hill P. Development and Validation of a TOPAS Monte Carlo Model of a Dynamic Collimation System for Pencil Beam Scanning Proton Therapy. Medical Physics, Vol. 48 (6). June 2021
- Geoghegan T, Patwardhan K, Smith B, Flynn R, Yu J, Gutierrez A, Hyer D. Quantifying of the Afterglow Effect from a Chromium-Doped Alumina Scintillator Following Proton Irradiation. Medical Physics, Vol. 48 (6). June 2021
- Geoghegan T, Patwardhan K, Smith B, Flynn R, Yu J, Gutierrez A, Hyer D. Design and Initial Testing of An Isocenter Alignment Prototype for the Proton Dynamic Collimation System. Medical Physics, Vol. 48 (6). June 2021
- Bennett L, Hyer D, Erhart K, Nelson N, Hill P, Patwardhan K, Geoghegan T, Smith B, Flynn R. Analytical Modeling of the Dynamic Collimation System Using Dual Trimmer Planes. Medical Physics, Vol. 48 (6). June 2021
- Patwardhan K, Geoghegan T, Smith B, Flynn R, Hyer D. Tuning, Calibration and Testing of a Dynamic Collimation System Controller for Pencil Beam Scanning Proton Therapy. Medical Physics, Vol. 48 (6). June 2021
- Geoghegan T, Nelson N, Patwardhan K, Flynn R, Hill P, Hyer D. Validation of Mechanical Accuracy and Impact on Dose Sensitivity for a Proton Dynamic Collimation System. Medical Physics, Vol. 47 (6). June 2020
- Bennett L, Hyer D, Erhart K, Smith B, Nelson N, Geoghegan T, Hill P, Flynn R. Evaluation of Range Robustness for a Dynamically Collimated Proton Therapy Treatment Plan. Medical Physics, Vol. 47 (6). June 2020
- Patwardhan K, Geoghegan T, Flynn R, Hyer D. Integration and Testing of Dynamic Collimation System Controller for Pencil Beam Scanning Proton Therapy. Medical Physics, Vol. 47 (6). June 2020
- Dunkerly D, Boczkowski A, Strand S, Geoghegan T, St-Aubin J, Yaddanapudi S. Automated Pickett Fence Test for Full MLC Bank on the Elekta Unity. Medical Physics, Vol 47 (6). June 2020
- Geoghegan T, Gutierrez A, Flynn R, Wang D, Hyer D. Determining optimal collimator and range shifter sequence for a proton dynamic collimation system. Medical Physics, Vol. 46 (6). June 2019
- Geoghegan T, Smith B, Gutierrez A, Flynn R, Wang D, Hyer D. Investigating the Impact of An Unfocused Collimator in Pencil Beam Scanning Proton Therapy. Medical Physics, Vol. 46 (6). June 2019
Geoghegan T, Patwardhan K, Bennett L, Yu J, Gutierrez A, Hill P, Flynn R, Hyer D. Attachment Reproducibility of the Accessory Tray-Mounted Proton Dynamic Collimation System. Medical Physics, Vol. 49 (6). June 2022 - Geoghegan T, Patwardhan K, Nelson N, Bennett L, Yu J, Gutierrez A, Hill P, Flynn R, Hyer D. Characterization of An Isocenter Alignment Device for the Proton PBS Dynamic Collimation System. Medical Physics, Vol. 49 (6). June 2022
- Geoghegan T, Patwardhan K, Smith B, Flynn R, Yu J, Gutierrez A, Hyer D. Quantifying of the Afterglow Effect from a Chromium-Doped Alumina Scintillator Following Proton Irradiation. Medical Physics, Vol. 48 (6). June 2021
- Geoghegan T, Nelson N, Patwardhan K, Flynn R, Hill P, Hyer D. Validation of Mechanical Accuracy and Impact on Dose Sensitivity for a Proton Dynamic Collimation System. Medical Physics, Vol. 47 (6). June 2020
- Geoghegan T, Gutierrez A, Flynn R, Wang D, Hyer D. Determining optimal collimator and range shifter sequence for a proton dynamic collimation system. Medical Physics, Vol. 46 (6). June 2019
- Geoghegan T, Smith B, Gutierrez A, Flynn R, Wang D, Hyer D. Investigating the Impact of An Unfocused Collimator in Pencil Beam Scanning Proton Therapy. Medical Physics, Vol. 46 (6). June 2019