All Denver Health radiologists are board-certified by the American Board of Radiology and all have completed fellowships and other advanced training. We offer subspecialist reads that are informed by the latest medical research. Each radiologist completes extensive medical education annually. Our radiologists participate in educating the next generation of medical providers by teaching University of Colorado School of Medicine students, residents and fellows.
Over the years, multiple Denver Health radiologists have been named “Top Docs” by 5280 Magazine, including Denver Health physicians specializing in Neuroradiology, Pediatric Radiology, Nuclear Medicine and Interventional Radiology.
We follow industry best practices, including the use of standardized reports and reports with hyperlinks to key images. Our Picture Archiving and Communications System (PACS) is state-of-the-art, having recently been updated in 2019.
The ultimate goal of Denver Health radiologists is to provide imaging services reflecting the highest standards of clinical excellence delivered in a compassionate, caring and respectful environment.
Meet Our Team:
- Interim Department Chair of Radiology
- Body Imaging
- Neuroradiology
- Musculoskeletal Imaging
- Breast Imaging
- Interventional Radiology
Interim Department Chair of Radiology
Ashesh Thaker, M.D.
Interim Department Chair of Radiology
Chief of Neuroradiology
Associate Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Neuroradiology
Dr. Thaker is interim Department Chair of Radiology and also serves as Chief of Neuroradiology, overseeing clinical, research, and educational programs related to neuroimaging.
Dr. Thaker earned his medical degree from University of California, Los Angeles, with an additional dedicated year at the National Institutes of Health as a Howard Hughes Medical Institute research scholar. He completed a research track residency in diagnostic radiology at the University of Pennsylvania and a two-year fellowship in neuroradiology at University of California, San Francisco, where he was chief fellow.
Prior to being recruited to Denver Health in 2023, Dr. Thaker practiced at University of Colorado Hospital and served in various leadership roles, including director of spine intervention and neuroradiology fellowship director. He is currently Associate Professor of Radiology at the University of Colorado School of Medicine where he educates students, residents, and fellows, and collaborates on neuroscience research. Dr. Thaker oversees neuroimaging for the CU Alzheimer’s and Cognition Center and is a funded co-investigator on several NIH grants. He has published numerous peer-reviewed research articles with a focus on dementia and epilepsy; his complete bibliography can be viewed here.
Dr. Thaker is certified by the American Board of Radiology with additional subspecialty certification in neuroradiology. He is active in multiple local and national radiology societies including the Colorado Radiological Society, American College of Radiology, and American Society of Neuroradiology.
Prior to pursuing medical training, Ashesh grew up in Greeley and attended University of Colorado Boulder on a Boettcher scholarship. He is an outdoor enthusiast, avid Colorado sports fan, and proud father of two boys.
Neuroradiology
John McMenamy, M.D., Associate Director of Radiology
Associate Professor of Clinical Practice, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Trauma, Emergency and Acute Care Radiology/Neuroradiology
Dr. McMenamy joined Denver Health in 2020 as the Associate Director of Service for Radiology at Denver Health, supporting the department’s clinical, research, and educational programs. He is an Associate Professor in the Department of Radiology at the University of Colorado School of Medicine.
Dr. McMenamy earned his medical degree at The University of Texas Medical School at Houston where he was class president. After medical school, he completed his diagnostic radiology residency at The University of Texas Southwestern (UTSW) in Dallas, during which he served as a chief resident. While at UTSW, he completed a neuroradiology fellowship, and he holds a Certificate of Additional Qualification (CAQ) in Neuroradiology, the highest level of certification offered by the American Board of Radiology in the subspecialty of Neuroradiology.
After completing neuroradiology fellowship, Dr. McMenamy joined NYU School of Medicine faculty, rising to the rank of Associate Professor and serving as Division Chief of Emergency Radiology where he oversaw the growth of the Emergency Radiology group from a single section of 6 members into a division with four sections comprised of 24 full-time faculty emergency radiologists covering multiple Level I trauma and stroke centers. He also served as the Director of Quality & Safety and Associate Director of High Reliability.
Dr. McMenamy is an experienced healthcare leader, educator, and mentor with an established track record of initiating and executing impactful quality, safety, and operational programs through robust performance improvement methodologies. Dr. McMenamy has a demonstrated ability to work effectively with leaders and physicians to create, engage, and lead diverse teams of front-line staff in accelerating achievement of institutional objectives. His training in these areas includes an MBA, a fellowship in Clinical Quality, Board Certification by the American Board of Medical Quality (CMQ), the highest level of lean training offered by NYC Health + Hospitals, and he has achieved Certified Physician Executive (CPE) status by the American Association for Physician Leadership.
Dr. McMenamy's academic interests focus on developing and executing programs to enhance quality, safety, and improvement education. While at NYU, he developed and led the radiology quality improvement curriculum and redesigned the NYC Health + Hospital clinician lean training program. His educational efforts involve all levels of experience, including medical students, residents, fellows, practicing physicians, NPs, PAs, RNs, and leaders throughout all areas of medicine. Dr. McMenamy has authored numerous peer-reviewed publications, presented dozens of quality- and safety-improvement project poster presentations, and was the recent recipient of 2020 American Society of Emergency Radiology - Neiman Health Policy Institute (ASER - NHPI) grant to improve healthcare system response to Mass Casualty Incidents (MCIs).
Mithun Diwakar, M.D., PhD
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Neuroradiology
Mithun Diwakar, MD, PhD is a Diagnostic Radiologist with an expertise in the area of Neuroradiology. Particular areas of clinical focus include traumatic brain injury, epilepsy, and functional neuroimaging (MEG).
Dr. Diwakar earned his Bachelor's of Science with honors from the California Institute of Technology (Caltech) in 2006. At Caltech, Dr. Diwakar was awarded the Stuart Foundation Upper Class Merit Award, the Carnation Merit Scholarship, and the Arie J. Haagen-Smit Memorial Award. Dr. Diwakar earned his Doctorate of Philosophy with honors in Bioengineering from the University of California San Diego (UCSD) in 2011. He earned his Doctorate of Medicine from UCSD in 2015 as well, after completion of the Medical Scientist Training Program. At UCSD, Dr. Diwakar was awarded the Department of Radiology Senior Student Award, the Dietschman Scholarship, and the Regent's Scholarship. Dr. Diwakar's transitional year internship was completed at the Harbor-UCLA Medical Center in 2016. Dr. Diwakar's residency was completed at the University of California San Francisco (UCSF) in 2020. Dr. Diwakar subsequently completed a fellowship in Diagnostic Neuroradiology at UCSF in 2021. During Dr. Diwakar's residency and fellowship, he was awarded a T32 research fellowship for pursuing research in the field of functional neuroimaging. Dr. Diwakar served as the residency program's webmaster from 2017-2019.
Dr. Diwakar holds the title of Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. Dr. Diwakar particularly focuses on the education of residents in the area of emergency Neuroradiology.
He is board-certified by the American Board of Radiology. Dr. Diwakar belongs to the Radiologic Society of North America (RSNA) and the American Society of Neuroradiology (ASNR).
Dr. Diwakar has been actively interested in research throughout his professional career, with 18 peer reviewed publications and 2 poster presentations at national/international conferences.
Hector Banchs, M.D.
Profile coming soon.
Michael Fleisher, M.D.
Profile coming soon.
Body Imaging
Elizabeth Dee, M.D.
Chief of Body Imaging
Clinical Instructor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Body Imaging
Dr. Dee graduated from the University of Virginia with her B.A. and M.D. Dr. Dee’s radiology residency and body imaging fellowship were completed at the University of Colorado where she was awarded the Outstanding Resident Teaching Award, the Outstanding Fellow Teaching Award, and the RSNA Roentgen Ray Research Resident/Fellow Award.
Dr. Dee is a Clinical Instructor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. During the course of her career, she has been awarded Denver Health’s Clinician of the Year Award, as well as being designated a “Top Doc” by 5280 Magazine, an honor bestowed on physicians in Denver.
Resident education in the area of body imaging and Denver Health’s Hepatobiliary Committee are two areas of particular interest.
She has been board-certified by the American Board of Radiology since 2003 and belongs to the Radiological Society of North America (RSNA), the American Roentgen Ray Society (ARRS), and the American College of Radiology (ACR).
Matthew Alfano, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Pediatric Imaging
Dr. Alfano is a Diagnostic Radiologist with expertise in general radiology and sub-specialty expertise in Pediatric imaging. At Denver Health, Dr. Alfano regularly attends imaging rounds with the PICU and NICU and enjoys working with residents in case conferences.
Dr. Alfano Graduated Magna Cum Laude from the University of North Dakota with an undergraduate degree in Aeronautics. He earned his medical degree from St. George’s University, where he graduated Magna Cum Laude. He also served as an anatomy instructor, was on the Dean’s List, and was an active member of the Iota Epsilon Alpha honor society. Dr. Alfano’s residency was completed at Dartmouth-Hitchcock Medical Center after an internship at Maimonides Medical Center. Dr. Alfano completed Fellowship in Pediatric Radiology at Boston Children’s Hospital. During Dr. Alfano’s residency and fellowship, he participated in research, proctored in the gross anatomy lab, and made trips to work in global health in Tanzania. He was awarded multiple teaching awards throughout his residency and fellowship. Dr. Alfano was awarded the prestigious John C. Stears Faculty Teaching Award in 2023.
Dr. Alfano holds the title of Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine and particularly focuses on the education of residents/fellows in the area of Pediatric imaging.
Dr. Alfano is board-certified by the American Board of Radiology and sub-specialty board-certified in Pediatric Radiology.
Dr. Alfano belongs to multiple societies and has participated in global health programs. Dr. Alfano has been awarded “Top Doc” by 5280 Magazine, an honor bestowed on top physicians in Denver.
Vanessa Campbell, D.O.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Body Imaging
Dr. Campbell is a Diagnostic and Interventional Radiologist in Abdominal Imaging. Particular areas of clinical interests include advanced MRI of the prostate, genitourinary system, liver, biliary system, and pancreas. She focuses on image-guided body procedures such as tumor ablation and biopsies. She also specializes in cancer staging and follow up imaging.
Dr. Campbell earned her medical degree from Rocky Vista University College of Osteopathic Medicine with an honors certificate in Global Health. While at Rocky Vista she was awarded the TOUCH award for community service each year of medical school. She completed residency at Beaumont Hospital in Michigan, during which she won several annual resident research awards and was a speaker at the Radiological Society of North America Annual meeting. Dr. Campbell then moved to Harvard Medical School Brigham and Women’s Hospital to complete a fellowship in Abdominal Imaging and Intervention.
Dr. Campbell holds the title of Assistant Professor at Denver Health's academic affiliate, the University of Colorado School of Medicine. Dr. Campbell particularly focuses on the education of residents/fellows in the area of abdominal imaging and image-guided procedures.
Dr. Campbell is board-certified by the American Board of Radiology.
Dr. Campbell belongs to the Radiological Society of North America (RSNA), Society of Abdominal Radiology (SAR), American Roentgen Ray Society (ARRS), American Association for Women Radiologists (AAWR), and RAD-AID International.
J. Matthew Kerchberger, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Body Imaging
Dr. Kerchberger is a Diagnostic Radiologist with an expertise in the area of Body Imaging. Particular areas of clinical focus include hepatobiliary imaging, gastrointestinal imaging, genitourinary imaging, gynecologic imaging, and cardiothoracic imaging.
Dr. Kerchberger received his undergraduate degree in economics from Georgetown University where he graduated Summa Cum Laude, was inducted into the Phi Beta Kappa honor society, and received the B.J. Phoenix Award in economics. Dr. Kerchberger earned his medical degree from Emory University School of Medicine where he was a member of the Alpha Omega Alpha honor society. Dr. Kerchberger concurrently earned a Master of Public Health degree in Health Policy and Management from Emory’s Rollins School of Public Health where he was inducted into the Delta Omega honor society. Dr. Kerchberger’s residency was completed at the University of California San Francisco (UCSF) after an internship at Emory. Dr. Kerchberger also completed his Fellowship in Abdominal Imaging and Ultrasound at the UCSF. During Dr. Kerchberger’s residency, he received the Elmer Ng Outstanding Resident Award; during his fellowship, he served as chief fellow and received the Outstanding Fellow/Clinical Instructor Teaching Award.
Dr. Kerchberger holds the title of Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine; he has received the John C. Stears Faculty Teaching Award while at Denver Health.
Dr. Kerchberger has been a co-author on multiple publications and has been a presenter at the Radiologic Society of North America (RSNA) Annual Meeting.
He is board-certified by the American Board of Radiology.
Nishant K. Mehta, M.D
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Body Imaging
Dr. Mehta is a Diagnostic Radiologist with an expertise in MRI. Particular areas of clinical focus include breast imaging and intervention and musculoskeletal MRI.
Dr. Mehta graduated summa cum laude from University of Southern California with a dual degree in Biomedical/Electrical Engineering. He received a USC Presidential Scholarship and was part of the Baccalaureate/MD program as an undergraduate student. Dr. Mehta attended the Keck School of Medicine at the University of Southern California where he was inducted into the Alpha Omega Alpha honor society. Dr. Mehta completed residency at Loma Linda University Medical Center in Loma Linda, California after an internship at St. Mary Medical Center in Long Beach, California. Dr. Mehta completed the prestigious Bradley MRI fellowship at UCSD Medical Center. During Dr. Mehta’s MRI fellowship, he had the opportunity to work with renowned subspecialty field leaders.
Dr. Mehta holds the title of Clinical Instructor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. Dr. Mehta particularly focuses on the education of residents/fellows in the area of breast imaging/intervention and musculoskeletal imaging.
Dr. Mehta is board-certified by the American Board of Radiology. He has been a member of the American Roentgen Ray Society (ARRS) and American College of Radiology. Dr. Mehta has been awarded “Top Doc” by 5280 Magazine, an honor bestowed on top physicians in Denver. In his free time, he enjoys mantra meditation, reading, and cooking.
Thanh Vu, M.D.
Clinical Instructor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Ultrasound, Body Imaging
Dr. Vu has been a member of the Department of Radiology at Denver Health since 2006. She received her undergraduate degree in religious studies and biology from University of Rochester in Rochester, N.Y. Dr. Vu’s medical degree was obtained from the University of Colorado School of Medicine. She completed a transitional internship at the University of Hawaii in Honolulu.
Her residency training and fellowship in body imaging both occurred at University of Colorado Health Sciences Center in Denver. She is board-certified by the American Board of Radiology. Dr. Vu holds the title of Clinical Instructor at Denver Health’s academic affiliate, the University of Colorado School of Medicine.
Graham Wallace, M.D.
Associate Professor of Clinical Practice, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Cardiothoracic Imaging, Body Imaging
Dr. Wallace is a diagnostic radiologist with an expertise in the area of cardiothoracic imaging. Areas of clinical focus include cardiac and vascular diseases, mediastinal, lung, and pleural diseases, oncologic imaging and trauma.
Dr. Wallace earned his medical degree at Kansas University Medical Center. He completed a Family Medicine Residency at the Scott Air Force Base – St. Louis University combined program and Diagnostic Radiology Residency at University of North Carolina Hospitals. Dr. Wallace completed a fellowship in Cardiac and Pulmonary Imaging at University of California San Francisco (UCSF).
As a career physician in the United States Air Force, Dr. Wallace served in many roles, including flight and family medicine, Family Practice Clinic Medical Director, radiology residency faculty, Chief of Radiology and as Chief of Medical Staff. In addition to stateside assignments, he has been stationed in South Korea, Italy, and England, as well as being deployed to Kuwait, South Korea and Afghanistan. He also served as volunteer faculty at University of California San Francisco for five years for which he was honored as the Outstanding Clinical faculty Member in Recognition of Teaching Excellence.
Dr. Wallace holds the title of Associate Professor of Clinical Radiology at Denver Health’s academic affiliate, the University of Colorado School of Medicine.
He is certified by the American Board of Radiology and belongs to the Society of Thoracic Radiology (STR), the American College of Radiology and the Radiologic Society of North America (RSNA).
Anthony Cai, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Nuclear Medicine
Dr. Cai joined Denver Health in 2024 as a diagnostic radiologist with a subspecialty in nuclear medicine and molecular imaging. Clinical interests include tumor imaging, everything PETCT, and nuclear medicine therapies.
Originally growing up in Indiana as the middle child of immigrant parents, Dr. Cai earned his bachelor's degree from Vanderbilt University with a double major in Neuroscience and Philosophy. Dr. Cai subsequently made his way to Dallas for medical school and earned his medical degree from the University of Texas Southwestern. After a transitional year in Evanston, IL, Dr. Cai attended the University of Colorado for diagnostic radiology residency and spent ample time rotating at Denver Health. Finally, Dr. Cai stayed at the University of Colorado for fellowship training in nuclear medicine and molecular imaging.
Outside of work, Dr. Cai enjoys spending time with the family, indoor rock climbing, and playing tabletop games.
Breast Imaging
Randy C. Miles, M.D.
Chief of Breast Imaging
Associate Director of Service for Radiology for Research
Associate Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Breast Imaging
Dr. Miles serves as the Chief of Breast imaging with oversight of the breast division’s clinical, research, and educational programs. He also serves as the Associate Director for Research in the Radiology Department.
Dr. Miles earned his medical degree from Mayo Clinic College of Medicine, where he was awarded the Miller Award for Humanitarianism related to his work leading medical mission trips to Haiti and the Dominican Republic. He also completed his Master’s in public health degree from Harvard School of Public Health during medical school, where he was selected as a Zuckerman Fellow. He completed his diagnostic radiology residency training at the University of Illinois- Chicago, where he served as chief resident, and completed his breast imaging fellowship training at the University of Washington Medical Center / Seattle Cancer Care Alliance.
Dr. Miles was recruited to Massachusetts General Hospital and Harvard Medical School following his fellowship training, where he served a variety of leadership roles, including education director and clinical service chief of breast imaging. As clinical service chief, he oversaw the division’s same-day care program, led implementation of contrast-enhanced mammography, and initiated numerous health equity initiatives.
Dr. Miles has been the recipient of numerous research grants, including the AUR GERRAF fellowship, RSNA Research & Education Foundation Education Development Imaging Cancer Grant, MGH Cancer Center and the Center for Innovation in Early Cancer Detection (CIECD) Award, Harvard Catalyst Faculty Fellowship, and The Eleanor and Miles Shore 50th Anniversary Fellowship Program (HMS) Award. Over his 4 years at MGH, Dr. Miles published nearly 50 academic papers and gave numerous talks nationally on his work in artificial intelligence, health literacy, and breast cancer disparities.
Dr. Miles’ educational efforts have involved trainees at all levels of experience, including medical students, residents, fellows, medical technologists, physician extenders, and attending physicians. He was awarded Teacher of the Year Award by residents during his time at MGH. He has also worked in Shanghai, China as a consultant, providing expertise on how to improve operational efficiency and patient experience in a breast imaging practice.
At Denver Health, Dr. Miles’ clinical, research, and public health efforts will center around using innovation to: 1) identify barriers to breast cancer screening, 2) create patient-centered initiatives to improve access to breast imaging services, and 3) examine how to improve delivery of high-quality, guideline-concordant breast care for all patients.
Dr. Miles holds the title of Associate Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine.
Christopher Doyle, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Breast Imaging
Dr. Doyle is a Diagnostic Radiologist with an expertise in breast imaging. He graduated from The University of Cincinnati College of Medicine, where he was admitted to the Arnold Gold Humanism Honors Society. He then completed his residency at the University of Chicago Hospitals after an internship in internal medicine at The Christ Hospital in Cincinnati Ohio where Dr. Doyle was presented the Larry Otto Family Centered Care Award. Dr. Doyle completed fellowship in breast imaging at Columbia University Medical Center /New York Presbyterian.
Dr. Doyle holds the title of assistant professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. He focuses on the education of residents and fellows in the area of breast cancer screening, diagnostic mammography, and breast intervention.
He is board certified by the American Board of Radiology and belongs to the Radiological Society of North America (RSNA), Society of Breast Imaging (SBI), and American College of Radiology (ACR).
Nhat-Tuan Tran, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Breast Imaging
Dr. Tran is a Diagnostic Radiologist with an expertise in the area of Breast Imaging. Particular areas of clinical focus include health disparities research, as well as community outreach.
Dr. Tran graduated from the University of Colorado Denver in Accounting and Biology. Dr. Tran earned his medical degree from the University of Colorado School of Medicine where he received the Adler Scholarship. Dr. Tran’s residency was completed at the University of Colorado after an internship in surgery at St. Joseph's Hospital in Denver. Dr. Tran completed his Fellowship in Breast Imaging at the University of Colorado.
Dr. Tran holds the title of Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. Dr. Tran particularly focuses on the education of residents and fellows in the area of health disparities, community outreach, and breast imaging.
Rebekah Anders, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Breast Imaging
Dr. Anders is a Diagnostic Radiologist with an expertise in breast imaging. She received her undergraduate degree in biology from the University of Georgia. Dr. Anders earned her medical degree from the Medical College of Georgia where she graduated with Alpha Omega Alpha honors. She completed her Internal Medicine internship at the University of Colorado Hospital. Dr. Anders completed her residency in Diagnostic Radiology at Northwestern Memorial hospital. She then went on to complete fellowship in Breast Imaging at Lynn Sage Comprehensive Breast Center at Northwestern Memorial Hospital where she held a coterminous position of Instructor of Radiology at Northwestern University Feinberg School of Medicine.
Dr. Anders holds the title of Assistant Professor at Denver Health’s academic affiliate, University of Colorado. School of Medicine. Dr. Anders believes firmly in practicing patient-centered and focused care. She also focuses on education on the next generation of residents and fellows. When not practicing radiology, Dr. Anders enjoys running, learning tennis, and reading.
Musculoskeletal Imaging
Sean Connor, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Musculoskeletal Imaging
Dr. Connor is a diagnostic radiologist in musculoskeletal imaging. Areas of clinical interest include sports MRI, trauma, and musculoskeletal ultrasound.
Dr. Connor received his undergraduate degree in biochemistry from the University of Denver. He earned his medical degree from Louisiana State University, where he graduated AΩA (Alpha Omega Alpha). After medical school, he completed his internship, radiology residency, and musculoskeletal fellowship at the University of New Mexico. During his training, Dr. Connor was awarded Intern and Fellow of the Year.
Dr. Connor has been a member of the American Roentgen Ray Society (ARRS), Radiologic Society of North America (RSNA), and Society of Skeletal Radiology (SSR). He enjoys the outdoors and spending time with his wife and three dogs.
Interventional Radiology
Eric Aaltonen, M.D.
Chief of Interventional Radiology
Clinical Associate Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Interventional Radiology
Dr. Aaltonen is an Interventional Radiologist (IR) with a clinical focus including interventional oncology and portal hypertension. At Denver Health, Dr. Aaltonen is the IR Chief and serves on the Credentialing and Procedural Sedation committees. Dr. Aaltonen graduated magna cum laude from Princeton University earning a degree in chemical engineering with a focus on engineering biology. Dr. Aaltonen earned his medical degree from Northwestern University Feinberg School of Medicine and concurrently a Master of Public Health degree from the Northwestern University Graduate School. He began residency training in diagnostic radiology at the University of Illinois, Chicago where he was named a chief resident during his second year prior to completing residency training at New York University.
Dr. Aaltonen completed his vascular and interventional radiology fellowship at University of California San Francisco in 2013. Dr. Aaltonen holds the title of Clinical Associate Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine and is board-certified by the American Board of Radiology. Dr. Aaltonen’s research and education interests include quality and operational optimization.
Dr. Aaltonen belongs to the Society of Interventional Radiology (SIR) and has served on the interventional oncology service line, association of IR program directors, and association of IR chiefs. Prior to joining Denver Health, Dr. Aaltonen practiced at NYU Langone Health where he served as IR fellowship and residency program director and was co-primary investigator for a multi-year Agency for Healthcare Research and Quality grant, focusing on the inpatient IR experience.
Stephen Dreyer, MD, MBA
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Interventional Radiology
Dr. Stephen Dreyer is an Interventional Radiologist with an expertise in the area of image-guided procedures. His areas of clinical focus include trauma, dialysis access creation and maintenance, and interventional oncology.
At Denver Health, Dr. Dreyer serves on the Trauma Council, as well as participates in many multi-disciplinary boards throughout the hospital.
Dr. Dreyer graduated from the University of Texas with a degree in biochemistry. He earned his medical degree from Baylor College of Medicine where he simultaneously completed a Master of Business Administration at Rice University. Dr. Dreyer’s internship and residency were completed at University Hospitals Case Medical Center. Dr. Dreyer completed his fellowship in Vascular and Interventional Radiology at M.D. Anderson Cancer Center. He is board-certified by the American Board of Radiology.
Dr. Dreyer holds the title of Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. Dr. Dreyer particularly focuses on the education of residents and fellows in the area of interventional radiology.
Adam Schwertner, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Interventional Radiology
Dr. Schwertner is an Interventional Radiologist with an expertise in the area of Vascular and Interventional Radiology. Particular areas of clinical focus include interventional oncology and dual-energy CT applications within Interventional Radiology.
Dr. Schwertner graduated from the University of Iowa with an undergraduate degree in Biomedical Engineering. Dr. Schwertner was a presidential scholar while at the University of Iowa. He earned his medical degree from the University of Chicago Pritzker School of Medicine where he graduated with Alpha Omega Alpha honors. Dr. Schwerner’s residency was completed at the University of California, San Francisco, after an internship at the University of Chicago, North Shore. Dr. Schwertner completed Fellowship in Vascular and Interventional Radiology at the University of California, San Francisco. During Dr. Schwerner’s residency, he performed research and gave national presentations on the new training pathway in Interventional Radiology.
Dr. Schwertner holds the title of Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. Dr. Schwertner particularly focuses on the education of residents, fellows, and PA Students in the area of image-guided procedures and Interventional Radiology.
He is board-certified by the American Board of Radiology. Dr. Schwertner belongs to the Society of Interventional Radiology (SIR) and the Radiological Society of North America (RSNA).
At Denver Health, Dr. Schwertner serves as the site director for a medical student rotation in Interventional Radiology for medical students from the University of Colorado School of Medicine.
Dr. Schwertner has a number of research interests with highlighted recent publications listed below:
- Schwertner A, McMenamy J, Naeger DM. Radiology Imaging Volume Changes During Discrete COVID-19 Pandemic Waves: Implications for the Delta Variant of Coronavirus and Future Pandemics. J Am Coll Radiol JACR. Published online November 23, 2021:S1546-1440(21)00918-2. doi:10.1016/j.jacr.2021.09.045
- Glencer A, Kirkwood K, Schwertner A, et al. Multidisciplinary Management of Postoperative Pancreatic Fistula. Dig Dis Interv. 2021;05(01):055-069. doi:10.1055/s-0040-1721785
- Schwertner A, Kohlbrenner RM, Seeley EJ, Lokken RP. Nonfibered Packing Coil Embolization of Pulmonary Artery Pseudoaneurysm Resulting in a Delayed Endobronchial Coil Migration. J Vasc Interv Radiol. Published online January 2021. doi:10.1016/j.jvir.2020.12.026
When not practicing as an Interventional Radiologist, Dr. Schwertner enjoys skiing, gardening, and golfing.