Imaging Physicians

 Matthew H. Blomquist, M.D.

Dr. Blomquist received his undergraduate degree from Wheaton (IL) College, and his medical degree from Boston University School of Medicine, graduating in 1991. From 1992-1996, he did his internship in internal medicine at The Graduate Hospital in Philadelphia, PA, then completed his radiology residency at the Pennsylvania State University Hospital (Milton Hershey Medical Center), serving as chief resident his final year. In 1997, he did a Body Imaging fellowship at the University of Colorado School of Medicine, earning a subspecialty in Cross-Sectional Imaging.

Dr. Blomquist joined as an associate with Boulder Radiologists, Inc. in 1997 and became a partner in 2000. Dr. Blomquist enjoys the diversity of this private practice and his interaction with BRI’s subspecialists and the medical staff at Boulder Community Health's campuses.

Dr. Blomquist is board certified in diagnostic radiology. He is a member of the American College of Radiology, the Radiological Society of North America, the Colorado Radiological Society, the American Roentgen Ray Society, and the Boulder County Medical Society. He has served Boulder Community Health as an active member of our Trauma Services Committee, our Medical Executive Committee, and the Committee for Clinician Health and Well Being.

Dr. Blomquist and his wife and children count it a true privilege to be here in Colorado. His interests outside of work include mountain biking, hiking, golfing, and alpine skiing.

 Charles Bowles, M.D.

Dr. Bowles received his undergraduate degree from Stanford University in 1978 and his medical degree from Vanderbilt University in 1982.  He completed his radiology residency at University of Colorado Health Sciences Center (1982-1986), which was followed by fellowship in cardiovascular and interventional radiology at Stanford University Hospital (1986-1987).

Dr Bowles joined as an associate with Boulder Radiologists, Inc. in 1987. Dr. Bowles is board certified in diagnostic, vascular and interventional radiology. He is a member of the Society of Interventional Radiology, American College of Radiology, the Colorado Radiological Society, the Colorado Medical Society and the Boulder Medical Society.

Particular interests include treatment of varicose veins, vertebroplasty or kyphoplasty for compression fractures, uterine fibroid embolization and percutaneous image-guided ablation of tumors.

Dr. Bowles has two children and enjoys skiing, bicycling, camping, rafting and kayaking.  Dr. Bowles is a part-time jazz musician who has been advised to keep his day job.

Richard M. Finer, M.D. (No photo available)

Dr. Finer received his medical degree from the Ohio State University College of Medicine in 1988. He then completed his radiology residency at Alton Ochsner Medical Foundation Hospital in New Orleans in 1993.

After finishing a fellowship in body imaging, including CT/MRI/Ultrasound at the University of California, Irvine, Dr. Finer was in private practice in Southern California. He joined Boulder Radiologists, Inc. and Boulder Community Hospital in 2001.

Dr. Finer is a board-certified diagnostic radiologist. He practices all facets of radiology, with a a special interest in CT,MRI and ultrasound along with women's imaging. He has extra experience in image-guided biopsies and drainage procedures using CT and ultrasound.

He also performs and supervises interventional and non-interventional angiographic procedures, including CT and MR angiography of the brain, carotids, aortic branches, and peripheral vasculature. Dr. Finer is happy to discuss any of these procedures with anyone interest in their applications.

Dr. Finer is a member of the Radiologic Society of North America and the American Roentgen Ray Society.

His interests outside of work include road and mountain biking, snowboarding, hiking, tennis and racquetball.  He is married and has a son.

 Robert E. Helgans, M.D.

Dr. Helgans is a Jersey native now residing in Boulder.  He earned his undergraduate degrees in architecture and systems engineering at University of Pennsylvania. 

Following a brief hiatus, he attended Robert Wood Johnson Medical School. He and his wife, Elizabeth, then moved to Denver to complete his diagnostic radiology residency at University of Colorado Health Science Center. 

Rob stayed on at UCHSC to complete a body imaging fellowship.  The fellowship emphasized oncologic and transplant imaging, with an emphasis on liver MRI and CT-guided procedures.

Dr. Helgans is an American College of Radiology certified radiologist now practicing general Diagnostic Imaging at Boulder Community Hospital and Foothills Community Hospital.  He is very happy to be a part of the Medical Staff and the Boulder community.

Gustavo L. Isuani, M.D. (No photo available)

Dr. Gus Isuani joined our practice in September 2003.  He graduated from medical school at Baylor College of Medicine in 1991 and completed an internship in internal medicine in 1992.  His four years of radiology residency was in Pennsylvania.  Dr. Isuani subsequently did a neuroradiology fellowship at the University of Maryland Medical System.  After six years of private practice in Texas, he finally saw the light and moved to Colorado.

In addition to his neuroradiology skills, Gus is fluent in Spanish and is learning French while watching Pinocchio with his daughter.

Gus, his wife and daughter enjoy hiking and traveling, but most particularly they love the scenery and weather in Colorado, which reminds them of their hometown of Mendoza, Argentina.

 Jie Mao, M.D.

Dr. Jie Mao completed the Junior Honors Medical Program at the University of Florida, where she obtained her medical degree. She then matriculated to the University of Colorado Health Sciences Center where she served a year of internship in general surgery, four years of residency in radiology, and one year of fellowship in vascular and interventional radiology.

In 2003, Dr. Mao joined the medical staff at BCH, where she practices both interventional and diagnostic radiology. Dr. Mao is an expert in a highly popular varicose vein treatment, treating more than 500 patients with varicose veins. Varicose veins can lead to serious health problems and helps treat patients with the latest options such as outpatient laser and radio-frequency procedures.

Dr. Mao also has special interest in noninvasive vascular imaging. She is also a regional expert in uterine fibroid embolization for the treatment of symptomatic fibroids and endovascular graft placement for the treatment of abdominal aortic aneurysms. She has in-depth experience in treating cancer in the liver with chemoembolization, radioembolization (Y90) and ablations.

Dr. Mao is always available to talk with patients about interventional radiology procedures that may serve as an alternative to more invasive treatments.

Dr. Mao is married to Dr. David Gatof, a practicing member of Gastroenterology of the Rockies.  They both love the community of Boulder and enjoy many outdoor activities such as biking, camping, hiking, and skiing.  Her favorite pastimes, however, are making bead jewelry and reading.

Jason Mehling, M.D. (no photo available)

Dr. Mehling graduated from the University of MN in 2000. He performed a surgical internship at the University of Minnesota, prior to performing his residency in Diagnostic Radiology and fellowship in Interventional Radiology at the University of Colorado Health Sciences Center from 2001 to 2006. He then returned to Minnesota to practice full time Interventional Radiology at Abbott Northwestern Hospital, a quaternary care center in Minneapolis, for nine and a half years. He served as vice chairman of the radiology department for three years, prior to performing an Executive Masters Degree in Healthcare Administration at the University of Minnesota, while practicing Interventional Radiology full time.

Dr. Mehling has expertise in Interventional Oncology, with particular interest in the treatment of primary and metastatic disease of the liver. He also has expertise in percutaneous endovascular treatment of thoracic aneurysms, abdominal aortic aneurysms, and peripheral vascular disease. He has extensive experience in the treatment of pulmonary and peripheral thromboembolic disease. He is always available for consultation.

In his spare time Jason enjoys cycling, skiing, baking bread, and spending time with his wife Melissa and daughters Melanie and Madeline.


 Roger D. Nichols, M.D.

Dr. Nichols received his undergraduate degree from the University of Iowa in 1985.  He graduated from University of Iowa College of Medicine in 1980.  He then performed his internship at the University of Nebraska Medical Center from 1989-1994.  He was chief resident in 1994 at University of Nebraska Medical Center.  He then completed a fellowship in MRI at Johns Hopkins Hospital in 1995.

In 1997, after two years in private practice in Little Rock, Arkansas, Dr. Nichols joined as an associate with Boulder Radiologists, Inc.

Dr. Nichols is board certified in diagnostic radiology and is a member of the American Medical Association, American College of Radiology, Radiological Society of North America, the Colorado Radiological Society, the American Roentgen Society, and the Boulder Medical Society.  He has served on many hospital committees, and is currently chairman of the Credentials Committee at Boulder Community Hospital.

Dr. Nichols’ areas of expertise include imagery of the injured athlete, diagnosis and treatment of cardiovascular disease, and oncology care.  He enjoys providing state-of-the-art care to his patients in a safe and comfortable environment.

Dr. Nichols has three wonderful children.  His outdoor hobbies include cycling, skiing, and watching his children play soccer.

 Christopher A. Nusser, M.D.

Dr. Nusser is a board-certified diagnostic radiology with expertise in musculoskeletal radiology who joined Boulder Radiologists, Inc. and Boulder Community Hospital in 2004.  He first came to Colorado for his undergraduate work at the U.S. Air Force Academy from Garden City, KS.  He received his B.S. in chemistry and biology in 1987 and then went on an AF scholarship to the University of Kansas Medical School.  After receiving his medical degree, he did his diagnostic radiology residency at the University of Oklahoma Health Science Center. 

After residency, Dr. Nusser spent nine years active duty in the Air Force fulfilling his incurred educational commitment achieving the rank of Lt. Col. This included three years at the USAF main teaching hospital and residency program as teaching staff in musculoskeletal radiology for two years and one year in thoracic radiology and mammography.  He then spent six years at the USAF Academy hospital as chief of musculoskeletal radiology and cross sectional imaging from 1998-2004.  He gained addition experience in musculoskeletal radiology with an emphasis in sports injuries.   In addition, he has experience and skill in a wide range of diagnostic radiology, including image guided biopsies.

Dr. Nusser is a member of American College of Radiology, Society of Skeletal Radiology, Radiology Society of North America, Roentgen Ray Society, Boulder County Medical Society, and Colorado Medical Society.

Dr. Nusser is married and has one daughter.  Their love of the outdoors is what kept them in Colorado after separating from the AF.  Hobbies include skiing, mountain biking, fly-fishing, hiking, and music.

 David A. Oppenheimer, M.D.

Dr. Oppenheimer received his undergraduate and medical degree from the six-year Honors Program in Medical Education at Northwestern University. He completed his residency and research fellowship at Stanford University.

A board-certified diagnostic radiologist, Dr. Oppenheimer has practiced at Boulder Community Hospital as his first and only job since 1983. He is the president of Boulder Radiologists Inc, a physician group  working exclusively with Boulder Community Hospital to provide the highest quality radiologist services available anywhere.

He practices all facets of diagnostic imaging. He has a special interest in woman's imaging, including mammography, minimally invasive breast biopsy, bone density testing (DEXA), and breast MRI. He is certified by the American College of Radiology, FDA, and the International Society of Clinical Densitometry.  He has served and currently serves on hospital committees and is the medical director of the Imaging Department.

Dr. Oppenheimer is a member of the Boulder County Medical Society, Radiologic Society of North America, American Roentgen Ray Society, and the International Society of Clinical Densitometry.

His hobbies include bicycling, skiing, gardening, and watching movies. He is married and has 2 children.

He is always available to answer questions about medical imaging for the Boulder community.

Nicholas Wickersham, M.D. (no photo and bio currently available)


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