Tim Winfree
Madison,WI
Overview
5
5
years of professional experience
Work History
Medical Imaging Analyst
Mayo Clinic
Rochester, MN
03.2022 - 06.2024
- Performed ROI annotation for coronary artery calcium scoring, including lesion segmentation, volume quantification, and Agatston score validation using 3D Slicer.
- Evaluated AI-generated material decomposition outputs (bone and soft tissue) for anatomical accuracy and bone marrow lesion detection in a multiple myeloma study, identifying artifacts and non-physiologic findings.
- Performed DICOM-based image preprocessing, quality control, and dataset curation for CT imaging studies supporting annotation and analysis workflows.
- Collaborated in interdisciplinary research environments to translate findings into peer-reviewed scientific publications.
- Used ImageJ to develop an automated airway wall thickness measurement algorithm, converting manual ROI-based measurements into reproducible quantitative pipelines for thoracic imaging research.
- Performed arterial stenosis identification and quantification in 3D Slicer, measuring luminal narrowing relative to adjacent normal vessel caliber to generate ground-truth labels for vascular imaging studies in photon-counting CT.
R&D Physics Intern
Accuray Inc.
Madison, WI
06.2019 - 06.2020
- Developed algorithms to streamline patient setup prior to radiation therapy delivery.
- Conducted CT Dose Index (CTDI) measurements for 510(k) regulatory compliance.
- Performed radiation dose calculations, simulations, and data analysis in MATLAB.
Education
Ph.D. - Bioengineering
University of Pennsylvania
Philadelphia, PA08-2025
M.S. - Biomedical Engineering – Biomedical Imaging Track
University of Wisconsin–Madison
Madison, WI12-2021
B.S. - Physics
University of Wisconsin–Madison
Madison, WI05-2019
Skills
- Python
- MATLAB
- DICOM
- 3D Slicer
- Syngovia
- ImageJ
- Visage
PUBLICATIONS
- Winfree T, McCollough C, Yu L. Development and validation of a noise insertion algorithm for photon-counting-detector CT. Med Phys. 2024; 51: 5943–5953.
- McCollough, Cynthia H. PhD, Winfree, Tim N. MS et al Photon-Counting Detector Computed Tomography Versus Energy-Integrating Detector Computed Tomography for Coronary Artery Calcium Quantitation.
Timeline
Medical Imaging Analyst
Mayo Clinic
03.2022 - 06.2024
R&D Physics Intern
Accuray Inc.
06.2019 - 06.2020
M.S. - Biomedical Engineering – Biomedical Imaging Track
University of Wisconsin–Madison
B.S. - Physics
University of Wisconsin–Madison
Ph.D. - Bioengineering
University of Pennsylvania