3rd Edition
Dowsett's Physics of Diagnostic Imaging
1. Radiation and X-ray production
2. Interactions of Radiation
3. Radiation detectors
4. Digital Images
5. Radiography
6. Fluoroscopy
7. Computed tomography
8. Radioactivity and Nuclear medicine
9. Nuclear medicine imaging
10. Principles of Ultrasound
11. Ultrasound Imaging
12. Principles of Magnetic resonance
13. Magnetic Resonance Imaging
14. Radiobiology
15. Radiation Protection
Biography
E. Russell (Russ) Ritenour completed a Ph.D. in physics from the University of Virginia in 1980.
His dissertation work involved theoretical and experimental studies in radiation dosimetry and
the design of radiation therapy dose and fractionation schemes for combined
radiotherapy/chemotherapy in solid tumors. After completing a post-doctoral fellowship in
Medical Physics at the University of Colorado Health Sciences center, he stayed on the faculty as
Director of Graduate Studies in Medical Physics until moving to the University of Minnesota in
1989 where he was Professor and Chief of Physics in the Department of Radiology, Medical
School, and Director of Graduate Studies in Biophysical Sciences and Medical Physics in the
Graduate School for twenty-five years. Since 2014, he has been a Professor of Medical Physics in
the Department of Radiology at the Medical University of South Carolina and has been given the honorific title of Emeritus beginning July 2026.
He has been a consultant to the U.S. Army for resident physics training and has served the
American Board of Radiology in various capacities since 1986 including membership in oral and
written exam committees and as Chair of the Physics Committee for the physics section of the
radiology resident’s exam. He also served as Imaging Physics Editor of the journals
Radiographics and The American Journal of Roentgenography. He has been a Board Member
and Treasurer of the Radiological Society of North America Research and Education Foundation,
and a Board Member of the International Organization of Medical Physics. Dr. Ritenour is
certified by the American Board of Radiology in Radiation Therapy and Diagnostic Radiologic
Medical Physics. He is a Fellow and Past President of the American Association of Physicists in
Medicine and a Fellow of the American College of Radiology.
Dr. Sameer Tipnis is currently a Professor of Radiology & Chief of Medical Physics in the Dept. of Radiology and
Radiological Science at the Medical University of South Carolina (MUSC). He received his PhD in Physics
from The University of Massachusetts Lowell in 1996. Thereafter, he worked in a research and
development firm for 7 years focusing on developing high-speed x-ray imaging systems and scintillators
for x-ray and gamma-ray imaging.
At MUSC, he provides guidance on optimizing imaging protocols in CT, Nuclear Medicine, and radiation
safety. He teaches radiology residents, cardiology fellows and medical students about physics of
radiological imaging and ionizing radiation. During his time at MUSC, Dr. Tipnis has served as the
Radiation Safety Officer for 7 years, overseeing the radiation safety program for the hospital and the
University. Dr. Tipnis is board certified by the American Board of Radiology (ABR) in Diagnostic Medical
Physics and Nuclear Medical Physics. Dr. Tipnis is a Fellow of the American Association of Physicists in
Medicine (AAPM) and chairs the task group TG361 on the recommended use and management of
protective garments. He is a member of 3 other sub-committees for radiation protection, radiology
resident curriculum, and cardiology fellow’s curriculum.
Dr. Tipnis serves on the Board of Trustees of the ABR as the trustee for Diagnostic Medical Physics, and
as an oral examiner for ABR’s Diagnostic and Nuclear Medicine certifying exams. He is currently a co-
Editor-in-Chief of Medical Physics International, a publication of the IOMP, section editor for radiology
physics for Contemporary Diagnostic Radiology and a member of the editorial board for the
Encyclopedia of Medical Physics. He is a faculty member at the biennially organized College on Medical
Physics, at the International Centre for Theoretical Physics, Trieste, Italy. Dr. Tipnis has published over 50
peer-reviewed research articles related to radiation exposure, techniques in radiological imaging, and
the development of scintillators.
