Juan Jose Rojas Letrado
Hempstead,NY
Summary
Pursuing a medical physics co-op position at Petrone Associates to apply my CAMPEP-accredited training and academic background in medical imaging, contributing to quality assurance, clinical support, and the delivery of safe, accurate patient care.
Overview
1
1
year of professional experience
Work History
Student
Long Island Jewish Medical Center
Queens, New York
01.2026 - Current
- Performed imaging quality assurance (QA) on Varian TrueBeam linear accelerators following TG-142 guidelines for both kV and MV imaging systems.
- Assessed image quality metrics including spatial resolution, contrast, uniformity, and geometric accuracy to ensure compliance with clinical standards.
- X-ray equipment quality assurance testing in accordance with NYS regulations, including half-value layer (HVL) determination and mAs linearity verification.
Student
North Shore University hospital
Manhasset, New York
09.2025 - 12.2025
- Performed Tc-99m dose calibrator quality control in accordance with regulatory standards, including constancy and accuracy checks.
- Conducted Geiger–Müller detector calibration and verification of radiation survey instruments.
- Evaluated scintillation detector efficiency, including reproducibility testing and determination of minimum detectable activity (MDA).
Student
Northwell Health Center for Advanced Medicine
New Hyde Park, New York
01.2025 - 05.2025
- Participated in monthly LINAC QA measurements (output constancy, symmetry, flatness) for Varian TrueBeam and Ethos.
- Supported IMRT/VMAT patient-specific QA using ion chamber measurements and Gamma analysis.
- Assisted with radiation shielding design calculations and monitor unit (MU) verification.
Education
Master of Science - Medical Physics
Hofstra University
New York, USA08-2024
Bachelor of Science - Applied Physics
University of Groningen
Groningen, The Netherlands09-2021
Skills
- Eclipse
- Python
- Matlab
- Bilingual Communication: English and Spanish
- Problem resolution
- Adaptability
Research
Hofstra University - AAPM Clinical Srping Meeting 2026 - Presenter
Dosimetric Effect of Hypersight CT-Number to Electron-Density Curves on AAA and Acuros Algorithms Calculated Plans
2026
• Evaluated the dosimetric impact of HyperSight CBCT CT-number to electron-density (CT-ED) calibration curves on treatment plans calculated with the AAA and Acuros algorithms in the Eclipse treatment planning system.
• Performed 3D gamma analysis (VeriSoft) on twenty brain treatment plans to assess dose calculation differences.
• Constructed an in-house CT-ED curve using the Sun Nuclear Advanced Electron Density Phantom on the Varian Halcyon HyperSight system and compared it with the manufacturer-provided calibration curve.
.
University of Groningen - Quantum Interactions and Structural Materials
Identifying TGGGGT and TTGGTT-based G-quadruplex Structures with Time of Flight Mass Spectrometry
2021
•Analyzed G-quadruplex molecules using time-of-flight mass spectrometry (TOF-MS) to identify precursor ions, charge states, and mass accuracy.
Timeline
Student
Long Island Jewish Medical Center
01.2026 - Current
Student
North Shore University hospital
09.2025 - 12.2025
Student
Northwell Health Center for Advanced Medicine
01.2025 - 05.2025
Master of Science - Medical Physics
Hofstra University
Bachelor of Science - Applied Physics
University of Groningen