Denver Health Radiologists

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.

Director

David M. Naeger, M.D., Director of Radiology
Professor and Vice Chair, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Cardiac and Thoracic Imaging, Nuclear Medicine

David Naeger MD

Dr. Naeger serves as the Director of Radiology at Denver Health, with oversight of the department’s clinical, research, and educational programs. He also serves as a Professor and Vice Chair in the Department of Radiology at the University of Colorado School of Medicine. 
 
Dr. Naeger earned his medical degree at Duke University School of Medicine, where he graduated AΩA (Alpha Omega Alpha), the most widely recognized honor society in medicine. After medical school, he moved to the University of California-San Francisco (UCSF) to complete his residency in Diagnostic Radiology, during which he served as a chief resident and was awarded the prestigious Elmer Ng Award.  While at UCSF, he completed a research fellowship and remained after his residency to complete clinical fellowships in Cardiac & Pulmonary Imaging and in Nuclear Medicine. After his fellowships, he was appointed to the faculty at UCSF, ultimately serving as the Department of Radiology's Associate Chair for Education and the co-director of the Henry I. Goldberg Center for Advanced Imaging Education. 
 
In 2019, Dr. Naeger joined Denver Health as the Director of Radiology and Professor and Vice Chair in the University of Colorado Department of Radiology. Dr. Naeger has direct oversight of Denver Health’s 125-person team, including radiologists, administrators, technologists, radiology nurses, transporters, clerks, and medical physics professionals.  Dr. Naeger has led numerous operational, quality, and safety initiatives including the optimization of imaging examination ordering and change orders, scheduling, exam throughput, dose reduction initiatives. Dr. Naeger oversees the Department’s and institution’s medical imaging strategic planning process with regards to equipment, services, and imaging spaces.  

Dr. Naeger has consistently been honored for his excellence as an educator. As the UCSF Department of Radiology’s Associate Chair for Education, Dr. Naeger oversaw medical student education, the Department’s continuing medical educational offerings, the Department’s Grand Rounds and seminar series, and was heavily involved in faculty development including teaching speaking skills and helping to onboard new academic faculty. Over his career, Dr. Naeger served as course director for multiple popular student electives and for numerous national and international courses intended for practicing radiologists. In 2015, Dr. Naeger was awarded the prestigious Academic Senate Distinction in Teaching Award given to only two UCSF faculty members per year across the entire institution. He was inducted into the Haile T. Debas Academy of Medical Educators in 2014 in recognition of his substantial contributions to medial education in the department. He served on the Committee on Curriculum and Educational Policy, UCSF’s highest-level school committee overseeing the physician program. 

Dr. Naeger’s research and interests focus on 1) operational excellence initiatives, 2) novel curricular programs that enhance the education of learners, from students through practicing radiologists and 3) the imaging and diagnosis of lung cancer, lung biopsies, chest imaging, and PET/CT imaging. He has authored 85 peer-reviewed publications, 12 book chapters, more than 60 abstracts and multiple non-peer reviews publications and teaching aids. Dr. Naeger has given more than 75 national and international lectures and numerous Grand Rounds presentations. 
 
Dr. Naeger is highly involved in national societies, including serving in several leadership roles. For the Association of University Radiologists, Dr. Naeger is currently a member of the Board of Directors and a past president for the Alliance of Medical Student Educators in Radiology (AMSER) and past Chair of the Alliance of Directors and Vice Chairs of Education in Radiology (ADVICER). For the Society of Thoracic Radiology, Dr. Naeger has chaired numerous ad hoc committees focused on online education. For the American Roentgen Ray Society, Dr. Naeger directs the annual meeting’s Review Track programing, while also Chairing the Clinician Educator Development Program, a signature Faculty Development program sponsored by the Society for promising junior faculty members. 
 
Dr. Naeger is an Associate Editor for the Journal Radiology for Thoracic Imaging, and a Deputy Editor for Academic Radiology for Education. Dr. Naeger reviews for 9 other journals and has received numerous reviewing awards. 

Dr. Naeger has a notable record of promoting diversity, equity, and inclusion. Through his work in the UCSF Department’s Diversity and Inclusion Committee, he helped to improve access to mentored clinical and research experiences for historically underrepresented groups in radiology. As Associate Chair for Education, he promoted Diversity and Inclusion programing in all educational programs, including awareness of biases, barriers to inclusion, and the importance of diversity in our workforce. At Denver Health and The University of Colorado, Dr. Naeger is a member of multiple diversity and inclusion committees/tasks forces where he is an advocate for health equity, and at the individual institutions, an advocate for inclusive policies for providers, staff, and learners. 

 


 

Diagnostic Radiologists

Dr. John McMenamy

John McMenamy, MD, MBA, Associate Director of Service, Denver Health Radiology
Associate Professor, Department of Radiology, University of Colorado School of Medicine

Subspecialty Focus:  Trauma, Emergency, and Acute Care Radiology

Dr. McMenamy joined Denver Health in 202-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).


Elizabeth Dee, M.D., Chair, CT Clinical Operations Committee
Instructor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Body Imaging

Dr. Dee has been a member of the Department of Radiology at Denver Health since 2004. She received her undergraduate and medical degrees from University of Virginia School of Medicine in Charlottesville, VA. Her transitional internship occurred at Deaconess Medical Center in Spokane, WA. Dr. Dee’s residency and fellowship training were undertaken at University of Colorado Health Sciences Center in Denver. She is board-certified by the American Board of Radiology.

Dr. Dee holds the title of Instructor, Department of Radiology, University of Colorado School of Medicine. She has been the recipient of numerous teaching awards. Dr. Dee has been a co-author of various peer-reviewed journal articles and scientific exhibits. In her work focused on the clinical CT operations, Dr. Dee has spearheaded efforts to streamline contrast ordering, CT standardized templates, and radiation safety procedures; Dr. Dee is an expert in the integration of online medical records with the operations of radiology. 

Dr. Dee was voted a “Top Doc” by 5280 magazine, an honor bestowed on top physicians in Denver. 

Michael A. Fleisher, M.D., Chair, MR Clinical Operations Committee
Instructor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Neuroradiology

Dr. Fleisher has been a member of the Department of Radiology at Denver Health since 2006. He received his undergraduate degree in economics from Johns Hopkins University in Baltimore, and his master’s degree in public health from Columbia University in New York. Dr. Fleisher received his medical degree from Jefferson Medical College in Philadelphia. His internship in general medicine occurred at Cedars Sanai Medical Center in Los Angeles, and his residency training was undertaken at Temple University Hospital in Philadelphia. Dr. Fleisher’s fellowship training in neuroradiology occurred at Los Angeles County Hospital in Los Angeles.

Dr. Fleisher holds the title of Clinical Instructor, Department of Radiology, University of Colorado School of Medicine. He is board-certified by the American Board of Radiology. Dr. Fleisher’s professional interests include the field of head and neck imaging, including malignancies and congenital abnormalities. He also focuses on traumatic injuries to the face, brain and spine. Dr. Fleisher participates regularly in interdepartmental conferences with Denver Health’s departments of Neurology, Neurosurgery, Orthopedic spine surgery and Otolaryngology. His educational interests include day-to-day education of the radiology residents on service and various lectures to the residents as a group.

Dr. Fleischer was awarded the Community Pillar Award in 2016 in recognition of the important role he plays at Denver Health and in the surrounding community. 

Dr. Fleischer was voted a “Top Doc” by 5280 magazine, an honor bestowed on top physicians in Denver.

Erica Pollack, M.D., Head of Women’s Imaging
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Breast Imaging

Dr. Pollack has been a member of the Department of Radiology at Denver Health since 2014. She received her undergraduate degree from Amherst College in Amherst, MA., and her medical degree from New York University School of Medicine in New York City, NY. Dr. Pollack completed her internship at Highland Hospital in Oakland, CA. She undertook a residency in diagnostic radiology, as well as a fellowship in breast imaging at Columbia University Medical Center in New York. She is board-certified by the American Board of Radiology. Dr. Pollack holds the title of Assistant Professor, Department of Radiology, University of Colorado School of Medicine. Her professional interests include breast imaging, biopsies, teaching and international radiology.

Linda Miketic-Fielding, M.D., Head of Nuclear Medicine
Associate Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Nuclear Medicine, Body Imaging

Dr. Fielding has been a member of the Department of Radiology at Denver Health since 2000. She received her undergraduate degree from Duke University in Durham, N.C., and her medical degree from the University of Pittsburgh. Both her internship and residency training were completed at St. Francis Medical Center in Pittsburgh. Dr. Fielding’s fellowship in oncology was undertaken at Massachusetts General Hospital, in Boston. She holds the title of Associate Professor, Department of Radiology, University of Colorado School of Medicine. She has been a coauthor of various peer-reviewed journal articles. She is board-certified by the American Board of Radiology. 

Dr. Miketic-Fielding was voted a “Top Doc” by 5280 magazine, an honor bestowed on top physicians in Denver.

Thanh Vu, M.D., Head of Ultrasound
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, Department of Radiology, University of Colorado School of Medicine. 
 
Jennifer Cranny, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Breast Imaging, Body Imaging
 
Dr. Cranny has been a member of the Department of Radiology at Denver Health since 2019. Dr. Cranny earned her undergraduate degree in chemistry from Texas A&M University in College Station, TX. She attended medical school at University of Texas Medical School in Houston, TX. Dr. Cranny undertook a transitional internship and residency at Baylor College of Medicine in Houston, TX. Her fellowship was completed at Emory University in Atlanta, GA.

Dr. Cranny currently holds the title of Assistant Professor, Department of Radiology, University of Colorado School of Medicine. Dr. Cranny is board-certified by the American Board of Radiology. Although Dr. Cranny’s clinical skills include a wide range of imaging services, she specializes in mammography and has held former directorial positions in breast imaging. She has been a coauthor of various peer-reviewed journal articles, and has served repeatedly as a course instructor focusing on breast MRI interventions for the Radiological Society of North America (RSNA).

Joseph Houkal, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Neuroradiology

Dr. Houkal has been with a member of the Department of Radiology at Denver Health since 2018. He earned his undergraduate degree in neuroscience from Amherst College in Amherst, MA during which he received the Phi Beta Kappa award for best performance in mathematics. Dr. Houkal’s medical degree was received from University of Colorado School of Medicine and his internship in general medicine was completed at Exempla St. Joseph Hospital in Denver, CO. His fellowship training in neuroradiology occurred at University of California in San Diego, CA. Dr. Houkal is board-certified by the American Board of Radiology and currently holds the title of Assistant Professor, Department of Radiology, University of Colorado School of Medicine. Dr. Houkal has been the coauthor of a number of scientific papers concerning both clinical and health policy research.

Nishant K. Mehta, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: MRI, Breast Imaging

Dr. Mehta has been a member of the Department of Radiology at Denver Health since 2018. He earned his undergraduate degree summa cum laude in biomedical/electrical engineering from the University of Southern California at Irvine, CA. Dr. Mehta earned his medical degree from the Keck School of Medicine at University of Southern California in Los Angeles, CA. He completed his internship at St. Mary Medical Center in Long Beach, CA and residency training at Loma Linda University Medical Center in Loma Linda, CA. Dr. Mehta was a recipient of the Bradley MRI Fellowship award, which is a prestigious fellowship named after William G. Bradley, Jr., PhD., FACR, a nationally recognized pioneer in clinical MRI imaging. His fellowship training occurred at University of California San Diego Medical Center. Dr. Mehta is a board-certified diplomate of the American Board of Radiology. He currently holds the title of Assistant Professor, Department of Radiology, University of Colorado School of Medicine. Across his professional career, Dr. Mehta has coauthored various educational exhibits and has served as a key speaker at selected professional radiologic society conferences.

Scott D. Tomsick, M.D.
Senior Instructor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Musculoskeletal Imaging

Dr. Tomsick has been a member of the Department of Radiology at Denver Health since 2010. Dr. Tomsick received his undergraduate degree in psychology from Duke University in Durham, NC, and his medical degree from University of Cincinnati College of Medicine in Cincinnati, OH. He completed his internship at Good Samaritan Hospital in Cincinnati, OH, and residency training at University of Cincinnati, Cincinnati, OH. Dr. Tomsick’s fellowship in musculoskeletal imaging was undertaken at University of Colorado Health Sciences Center in Denver, CO during which he received the fellow teaching award. Dr. Tomsick currently holds the title of Clinical Instructor, Department of Radiology, University of Colorado School of Medicine. He is board-certified by the American Board of Radiology. Dr. Tomsick has coauthored various publications with a particular focus on musculoskeletal and spine disease/injury.

 

Matt Alfano, M.D., Pediatric Radiologist

Assistant Professor, Department of Radiology, University of Colorado School of Medicine

Subspecialty Focus:  Pediatric Radiology

Dr. Alfano jointed the Denver Health Department of Radiology in 2020.  He completed his fellowship in Pediatric Radiology at Boston Children’s Hospital and Harvard Medical School and graduated from Radiology Residency at Dartmouth-Hitchcock Medical Center and Geisel School of Medicine at Dartmouth.  His undergraduate degree is from the University of North Dakota, and he went to medical school at St. George’s University.  Dr. Alfano specializes in Pediatric Radiology and has been intimately involved in global health outreach and education.

Dr. Alfano is an Assistant Professor at the University of Colorado School of Medicine.  He has received multiple teaching awards in residency and fellowship and enjoys collaborative learning.

Interventional Radiologists

Dr. Eric Altonen

 
 
 
 
 
 
 
 
Eric T. Aaltonen, M.D., M.P.H., Chief of Interventional Radiology, Denver Health Radiology

Associate Professor, Department of Radiology, University of Colorado School of Medicine

Dr. Aaltonen joined the Denver Health Department of Radiology in 2020 to serve as chief of the interventional radiology (IR) section.

Dr. Aaltonen earned his undergraduate degree in Chemical Engineering from Princeton University and his medical degree from Northwestern University Feinberg School of Medicine.  During medical school, he also obtained 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 (UIC) and completed residency training at New York University (NYU).  Dr. Aaltonen completed fellowship training in vascular and interventional radiology at University of California San Francisco (UCSF).  Following completion of his training at UCSF in 2013, Dr. Aaltonen returned to the NYU Department of Radiology as faculty in the IR section.  While on faculty at NYU, Dr. Aaltonen was co-primary investigator for a multi-year Agency for Healthcare Research and Quality (AHRQ) grant, focusing on the inpatient IR experience.  Dr. Aaltonen’s research interests include quality and operational optimization.  His clinical interests include interventional oncology and hepatobiliary interventions.  Dr. Aaltonen is board certified by the American Board of Radiology in interventional and diagnostic radiology and is a member of the American Medical Association and the Society of Interventional Radiology.

 

 

Stephen Dreyer, MD, MBA Interventional RadiologistDr. Stephen Dreyer

Assistant Professor, Department of Radiology, University of Colorado School of Medicine

Dr. Dreyer joined the Denver Health Interventional Radiology section in 2020 when he brought in a wealth of experience and energy to expand the IR services offered at DH.

Dr. Dreyer came to Denver Health after completing his undergraduate degree at the University of Texas in Austin, his Masters of Business Administration and Doctor of Medicine at Rice University’s Jesse Jones Graduate School of Management and the Baylor College of Medicine, respectively, both in Houston. Dr. Dreyer’s post graduate training was at the Case Western Reserve University in Cleveland OH where he served as a chief resident followed by fellowship in Vascular and Interventional Radiology at University of Texas MD Anderson Cancer Center, Houston.

Dr. Dreyer is a member of the American College of Radiology, the Radiological Society of North America, and the Society of Interventional Radiology. He has participated as a co-investigator in at least one open label phase 2 trial. Dr. Dreyer has presented numerous poster and oral presentations, and has multiple peer reviewer complications.

 

Meredith McDermott, MD, Interventional RadiologistDr. Meredith McDermott

Assistant Professor, Department of Radiology, University of Colorado School of Medicine

Dr. McDermott has been a member of the Department of Radiology at Denver Health since 2020.  She received her undergraduate degree in chemistry from the University of Pittsburgh in Pennsylvania.  Dr. McDermott also received her medical degree from the University of Pittsburgh School of Medicine and completed her transitional year internship at the University of Pittsburgh Medical Center.  She completed her residency in diagnostic radiology and fellowship in interventional radiology at New York University Langone Health in New York City, NY. 

After completing her fellowship she was appointed to the faculty at New York University Langone Health where she led medical student and residency education for the interventional radiology section.

Dr. McDermott holds the title of Assistant Professor, Department of Radiology, University of Colorado School of Medicine.  She is board-certified by the American Board of Radiology in interventional and diagnostic radiology and is a member of the Society of Interventional Radiology.  Dr. McDermott’s professional interests include women’s health and minimally invasive treatments for fibroids and arteriovenous malformations.  She has authored several publications in peer-reviewed journals and has presented her research at national meetings.

 

Adam Schwertner, MD, Interventional RadiologistDr. Adam Schwertner

Assistant Professor, Department of Radiology, University of Colorado School of Medicine

Subspecialty Focus:  Vascular Radiology

Dr. Schwertner has been a member of the Department of Radiology at Denver Health since 2020.  He received his undergraduate degree in biomedical engineering at the University of Iowa in Iowa City, IA, and his medical degree from the University of Chicago Pritzker School of Medicine in Chicago, IL, where he graduated AΩA (Alpha Omega Alpha). 

After medical school, he completed residency in Diagnostic Radiology at the University of California-San Francisco.  Following residency, he completed a fellowship in Vascular and Interventional Radiology at the University of California-San Francisco.

Dr. Schwertner currently holds the title of Assistant Professor, Department of Radiology, University of Colorado School of Medicine.  He has been a coauthor of various peer-reviewed journal articles and textbook chapters with particular interest in medical education, interventional oncology, and dual-energy CT applications within Interventional Radiology.