Our Radiologists
Leveraging a cutting-edge, AI-enabled platform, Matrix at RP, we provide 24/7 remote radiology services focused on emergent imaging support to RP practices across the country.
Dr. Carla Ramas
Body Imaging Radiologist
Matrix at RP Local Practice Board
Practice President, Matrix Board Chair
Dr. Eugene Oh is a board-certified musculoskeletal radiologist who serves as Matrix practice president and local practice board chair. His areas of focus include recruitment, retention, organizational culture and enhancing the radiologist experience through physician-led leadership. He is committed to fostering a collaborative culture that brings together top radiologists and effective leaders to deliver exceptional clinical value and high-quality radiology services.
Dr. Oh completed his medical degree at Perelman School of Medicine at the University of Pennsylvania and advanced residency training at University of Michigan.
Local Practice Board
Dr. Trey Fuller is a neuroradiologist who serves as a member of the Matrix local practice board, peer learning committee and recruiting committee. His focus is on providing meaningful educational opportunities to enhance the delivery of high-quality patient care to patients served by Matrix radiologists.
Dr. Fuller completed his medical degree at University of Miami School of Medicine and advanced residency training at University of Washington School of Medicine.
Local Practice Board
Dr. Gregory Hall is a general diagnostic radiologist who currently serves as RP Matrix Midwest section chief. In this role, he acts as a primary liaison between the operations team, the designated sites, and the radiologists within the section. He is responsible for maintaining clinical quality, enhancing workflow efficiency, and leading team management initiatives. He also serves as a member of the LPB and actively participates on the recruiting committee.
Dr. Hall has practiced teleradiology since he retired from the U.S. Navy in 2013. Prior to teleradiology, Dr. Hall served as the radiology department head at the Naval Medical Center at Camp Lejeune, North Carolina, and the radiology department head and director of clinical support services at the Expeditionary Medical Facility in Kuwait.
He earned his medical degree from Uniformed Services University in Bethesda, Maryland. He completed his pediatric internship at the Naval Medical Center of Portsmouth, Virginia, and his residency at the National Capital Consortium in Bethesda, Maryland.
Associate Chief Medical Officer, Local Practice Board
Dr. James Lyons serves as associate chief medical officer of clinical operations for Radiology Partners, supporting the implementation of clinical programs, IT and AI tools and managing operations for our partner practices.
Dr. Lyons is a vascular and interventional radiologist and chairman at Southwest Diagnostic Imaging (SDI) in Scottsdale, Arizona. He previously served as president for RP Phoenix, leading SDI through the transition to RP while serving as executive vice president.
Dr. Lyons earned his medical degree from University of Texas Southwestern Medical Center in Dallas. He completed his residency and fellowship at Western Pennsylvania Hospital in Pittsburgh.
VP of Rad Operations, Local Practice Board
Dr. Tony Maung is a neuroradiologist who serves as vice president of radiology operations at Matrix. In this role, he focuses on optimizing clinical workflows, improving daily practice efficiency and managing radiologist scheduling and performance. By bridging the gap between clinical excellence and operational logistics, Dr. Maung works to ensure seamless shift pacing and maximum productivity across the practice.
He also serves as Matrix Clinical Lead for Matrix, spearheading the integration of advanced technologies, including speech-to-text engines and large language models (LLMs), to streamline radiology reporting and reduce administrative burden for clinicians.
Dr. Maung completed his medical degree and advanced residency training at Harbor-UCLA Medical Center.
Local Practice Board
Dr. Khanh Nguyen is a board-certified musculoskeletal radiologist who serves as a member of the Matrix local practice board and leads the recruiting committee. His focus is to guide the evaluation process to ensure the recruitment of exceptional radiologists who contribute positively to Matrix’s culture.
Dr. Khanh Nguyen completed his medical degree and advanced residency training at University of Texas Health Science at San Antonio.
Local Practice Board
Dr. David Riesz is a general diagnostic radiologist. He currently serves as a member of the Matrix local practice board and actively contributes to the patient safety and imaging protocol committees. His primary focus is to ensure diagnostic excellence by identifying, addressing and resolving image quality issues. Through thorough review processes, Dr. Riesz strives to enhance clinical documentation to support the highest standards of patient care and diagnostic accuracy.
Dr. Riesz completed his medical degree at the University of Texas Southwestern Medical Center and his advanced residency training at Scott and White Memorial Hospital.
Chief of Staff, Local Practice Board
Dr. Cynthia Wallentin is a practicing neuroradiologist who joined Matrix in 2020. Additionally, she serves as Matrix chief of staff, where she focuses on strengthening radiologist engagement, promoting fairness and accountability and addressing issues that affect radiologists’ daily work at the practice.
She also serves as associate director of peer learning at Matrix and is a member of the RP national quality and safety committee, with a focus on advancing quality initiatives and promoting a culture of continuous improvement.
Dr. Wallentin completed her medical degree at The Warren Alpert Medical School of Brown University, residency training at Norwalk Hospital and fellowship training in neuroradiology at Beth Israel Deaconess Medical Center in Boston.