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DOCTORS SPECIALIZING IN
HumanCare

Our Doctors

Radiologists are physicians that utilize a variety of imaging technologies such as ultrasound, computed tomography (CT), and magnetic resonance imaging (MRI) to diagnose illness. Our Radiologists provide referring physicians with the information they need to determine the appropriate treatment for their patients. All of our Radiologists are certified by the American Board of Radiology and are further sub-specialized in various areas of expertise, including Body Imaging, Neuroradiology, Musculoskeletal Imaging, Nuclear Medicine, Emergency Radiology, Mammography and Vascular / Interventional Radiology.

Richard Porzio, MD
Richard Porzio, MD
President
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Richard Porzio, MD

President

Board Certified Diagnostic Radiologist
Specialized in Body Imaging
American Board of Radiology

Dr. Richard Porzio joined Rads, Inc. after completing a Body Imaging Fellowship at Stanford University in Palo Alto. A native of the San Jose area, Dr. Porzio earned a Bachelors of Science degree in Biopsychology from the University of California at Santa Barbara, graduating with Honors.

After completing a year of research in Neurology at Stanford University's Sleep Lab, he attended medical school at Wayne State University. Dr. Porzio returned to Northern California for post-graduate training at Santa Clara Valley Medical Center in San Jose and fellowship training at Stanford University Medical Center in Palo Alto. Throughout his education, Dr. Porzio has earned many honors including University of California Regent Scholar and Radiology Chief Resident at SCVMC. Dr. Porzio's state of the art training in Ultrasound, Computed Tomography, and Magnetic Resonance Imaging ensures that his patients receive the highest quality diagnostic care.

Dr. Porzio has been the President of Rads, Inc. since 2003.

Sam Kokoris, MD
Sam Kokoris, MD
Vice-President and Chief Technical Officer
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Sam Kokoris, MD

Vice-President and Chief Technical Officer

Board Certified Diagnostic Radiologist
Medical Informatics
American Board of Radiology

Dr. Sam Kokoris joined Rads, Inc., then known as Central Valley Imaging, in 1997 and has been an instrumental part of the company's growth.

A native of San Joaquin County, Dr. Kokoris attended the University of California, Davis where he received a Bachelor of Science degree in Genetics in 1987. He earned his Medical Degree at the University of Southern California School of Medicine in 1991 and spent the following year as a Radiology Research Fellow. Internship followed at Cedars-Sinai Medical Center in Los Angeles. Dr. Kokoris returned to Northern California to complete his Radiology Residency at Santa Clara Valley Medical Center in 1997.

Throughout his education and training, Dr. Kokoris achieved several honors including three coveted scholarships, the Dean's Scholar Award, and a seat on SMS Data Systems Radiology Advisory Panel. .

Dr. Kokoris is the founding partner of Rads Inc. and has been an integral part of the companies growth and vision through the use of leading-edge technology. Dr. Kokoris currently serves as the Vice-President and Chief Technical Officer of Rads, Inc.

T. Tejpal Singh, MD
T. Tejpal Singh, MD
Chief Financial Officer
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T. Tejpal Singh, MD

Chief Financial Officer

Board Certified Diagnostic Radiologist
Specialized in Musculoskeletal Imaging
American Board of Radiology

Dr. Tejpal Singh joined Rads, Inc. after finishing a MRI fellowship in Neuroradiology and Musculoskeletal imaging at the University of California, San Diego. Prior to that, he completed Medical School and Residency at UC Davis, with a one year internship at San Joaquin General Hospital.

Dr. Singh also brings an engineer's perspective to the field of Radiology and medicine, having obtained Master of Science degrees in Electrical and Computer Engineering from the California Institute of Technology, Pasadena and the University of Southern California, respectively. He now combines these skills to enhance patient care with efficient use of resources and cutting edge technology.

He has authored several papers in MRI and is a reviewer of an international MRI educational lecture series.

Dr. Singh serves as the CFO of Rads, Inc.

Mario Sattah, MD
Mario Sattah, MD
Director of Interventional Radiology
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Mario Sattah, MD

Director of Interventional Radiology

Board Certified Diagnostic Radiologist
Specialized in Vascular and Interventional Radiology
American Board of Radiology

Dr. Mario Sattah joined Rads, Inc. in 2006 bringing with him experience in Diagnostic, Vascular, and Interventional Radiology.

Dr. Sattah graduated from Emory University in Atlanta, Georgia with a Bachelor of Science in Biology and a Bachelor of Arts in Philosophy. He continued at Emory earning his M.D. in 1994 followed by a General Surgery Internship in 1995. From 1996-2000 he completed his Diagnostic Radiology Residency through the Emory University Hospital Radiology Program. Dr. Sattah continued his Radiology education by completing a Vascular and Interventional Fellowship also at Emory University.

Throughout his education and training, Dr. Sattah has achieved several honors such as being a recipient of the Dean's Scholarship and graduating Summa Cum Laude from Emory as an undergraduate. He was also a member of two prestigious honor societies, Phi Beta Kappa and Alpha Epsilon Delta.

Dr. Sattah is Board Certified in Diagnostic, Vascular, and Interventional Radiology making him a valuable addition to Rads, Inc. He is currently serving as the Director of Interventional Radiology.

Conway Lien, MD
Conway Lien, MD
Medical Director of Radiology at Regional Medical Center San Jose
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Conway Lien, MD

Medical Director of Radiology at Regional Medical Center San Jose

Board Certified Diagnostic Radiologist
Specialized in Neuroradiology
American Board of Radiology

Dr. Conway Lien joined Rads, Inc. in 2007 after completing a Neuroradiology Fellowship at Stanford University Medical Center in Palo Alto.

Dr. Lien graduated with Honors from the University of California, Berkeley earning a Bachelor Degree in Molecular and Cell Biology. He attended Medical School at Tufts University School of Medicine in Boston. After earning his MD in 2000, he returned to California where he interned at Santa Clara Valley Medical Center. Dr. Lien also completed his Radiology Residency at Santa Clara Valley Medical Center serving as Chief Resident from 2003 to 2004.

Dr. Lien is Board Certified in both Diagnostic Radiology and Neuroradiology. His extensive training and distinguished educational background is reflected in the high level of diagnostic care he provides.

Dr. Lien is currently serving as Medical Director of the Department of Radiology at Regional Medical Center San Jose.

Robert Lim, MD
Robert Lim, MD
Medical Director of Radiology at Sutter Tracy Community Hospital
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Robert Lim, MD

Medical Director of Radiology at Sutter Tracy Community Hospital

Board Certified Diagnostic Radiologist
Specialized in Emergency Radiology
American Board of Radiology

Dr. Robert Lim joined Rads, Inc. in 2008 after completing an Emergency Radiology Fellowship at Massachusetts General Hospital, an affiliate of Harvard Medical School.

Dr. Lim graduated from Cornell University, Ithaca, New York with a Bachelor of Science in 1997. He then attended SUNY Upstate Medical University, Syracuse, NY where he earned his Medical Degree. His training continued with an Internal Medicine Internship at St. Vincent's Hospital at Worcester Medical Center followed by his Diagnostic Radiology Residency at Tufts New England Medical Center, Boston, MA.

Dr. Lim was a member of the Alpha Epsilon Delta Honor Society and has received Clinical Honors in Radiology and Pediatrics. He received the Radiology Achievement Award in 2002 and served as the Chief Radiology Resident at Tufts New England Medical Center from 2005-2006.

His strong academic background, up to date training, and professionalism has made Dr. Lim an excellent addition to Rads, Inc.

Dr. Lim is currently serving as the Medical Director of the Radiology Department at Sutter Tracy Community Hospital.

Kyle Yu, MD
Kyle Yu, MD
Medical Director of Radiology at Saint Louise Regional Hospital
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Kyle Yu, MD

Medical Director of Radiology at Saint Louise Regional Hospital

Board Certified Diagnostic Radiologist
Specialized in Musculoskeletal Imaging
American Board of Radiology

A native Californian, Dr. Kyle Yu received his undergraduate training in biology at Stanford University, graduating with distinction in 1985. He then attended medical school at the University of California, San Diego. After completing an internship in internal medicine at St. Mary's Hospital in San Francisco, he entered the Diagnostic Radiology Scholars Program at the University of California, San Francisco, where he received his radiology residency training.

After residency, Dr. Yu continued his radiology training at U.C.S.F., completing clinical fellowships in MR imaging & ultrasound, abdominal imaging, and a mini-fellowship in musculoskeletal MRI at the San Francisco Magnetic Resonance Center. Due to his interest in health care policy, Dr. Yu also undertook postdoctoral fellowships in health services research in the Advanced Training in Clinical Research Program and in the Health Services Research Training Program at the U.C.S.F. Institute for Health Policy Studies.

After completing his radiology training in 1996, Dr. Yu joined the attending staff in the Department of Radiology at U.C.S.F. as Assistant Professor. During his short but productive academic career, Dr. Yu published over 30 articles in peer-reviewed journals, authored a number of book chapters, gave numerous lectures both locally and nationally, and was co-investigator on several research grants, including one from the N.I.H. Dr. Yu also served as Director of the Radiology Residency Program at Santa Clara Valley Medical Center in San Jose, California.

Dr. Yu has received a number of honors and awards during his education and academic career. After undergraduate training at Stanford, he was invited to join the Phi Beta Kappa Society. He received the Walter L. Robb Fellowship award at the end of his radiology residency training at U.C.S.F. While in academic practice, Dr. Yu received the General Electric-AUR Radiology Research Academic Fellowship and Editor's Recognition award for distinction as a peer reviewer for the journal Radiology. He was also awarded a N.I.H. grant from the National Cancer Institute for "Imaging in Risk Assessment of Prostate Cancer Patients."

Dr. Yu has been with RaDS, Inc. since 2004 where he strives to provide high quality patient care and excellent service to referring physicians. His subspecialty expertise is in body and musculoskeletal MR imaging, with other areas of interest including oncologic imaging and women's imaging. Dr Yu is currently serving as Medical Director of the Department of Radiology at Saint Louise Regional Hospital.

Nidhi Gupta, MD
Nidhi Gupta, MD
Associate Radiologist and Mammography/CME Officer
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Nidhi Gupta, MD

Associate Radiologist and Mammography/CME Officer

Board Certified Diagnostic Radiologist
Specialized in Abdominal Imaging
American Board of Radiology

Dr. Nidhi Gupta graduated Summa Cum Laude from the University of California, Los Angeles earning her Bachelor of Science in Physiological Science with a minor in Neuroscience. She then received her medical degree at the Keck School of Medicine of the University of Southern California. Her medical training continued with an internship in Internal Medicine at the University of California, Irvine followed by a diagnostic radiology residency at Santa Clara Valley Medical Center in San Jose. She then completed a one-year fellowship in Abdominal Imaging at the University of California, San Francisco, which included training at the San Francisco VA Medical Center and San Francisco General Hospital.

Following completion of her fellowship, Dr. Gupta worked as a pool physician in general radiology at Kaiser Permanente South San Francisco. In October 2012 she accepted the position of Assistant Clinical Professor in Abdominal Imaging at the University of California, San Francisco, and the San Francisco VA Medical Center.Dr. Gupta joined Rads, Inc. in August 2013.

Wayne Tran, MD
Wayne Tran, MD
Medical Director of Radiology at Doctors Hospital of Manteca
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Wayne Tran, MD

Medical Director of Radiology at Doctors Hospital of Manteca

Board Certified Diagnostic Radiologist
Specialized in Nuclear Medicine
American Board of Radiology

Dr Wayne Tran completed his undergraduate and medical school training at Creighton University in Omaha, Nebraska in 2007. He then began his radiology residency at Maine Medical Center in Portland, Maine. During this time, Dr. Tran served as Department Chair of Radiology at the University of New England (UNE) Medical School from 2010-2012, and was named Clinical Professor of the Year both of those years. Additionally, he was an adjunct professor at the UNE School for Physicians Assistants from 2010-2012. Dr. Tran gave many presentations at multiple conferences during his residency and served as Chief Resident from 2011-2012.

Wayne Tran joined Rads, Inc. in August of 2013 after completing a Nuclear Medicine fellowship at UCSF.

Joseph Marshall, MD
Joseph Marshall, MD
Medical Director of Radiology at San Joaquin General Hospital
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Joseph Marshall, MD

Medical Director of Radiology at San Joaquin General Hospital

Board Certified Diagnostic Radiologist
Specialized in Vascular and Interventional Radiology
American Board of Radiology

Dr. Joseph Marshall joined Rads in 2013, bringing years of experience in Diagnostic, Vascular and Interventional Radiology. A native Southern Californian,Dr. Marshall graduated with highest honors in 1983 from San Diego State University with a Bachelors of Science degree in Biology. From there he received his MD degree from the University of California, Davis in 1988. Internship and residency followed in Internal Medicine at UCSF, Fresno becoming board certified in 1992. After residency, Dr. Marshall practiced and taught Internal Medicine at the VA Hospital in Fresno for 4 years becoming Chief of General Internal Medicine.

Realizing his true calling was Radiology, Dr. Marshall then completed 4 years of Diagnostic Radiology residency at UCSF, Fresno becoming Chief Resident and obtaining board certification in 2001. Further training ensued at Emory University in Atlanta, Georgia with subsequent board certification in Vascular and Interventional Radiology in 2002. Dr. Marshall  practiced Diagnostic, Vascular and Interventional Radiology first in Hawaii and then in Iowa for 12 years.

Dr. Marshall is Medical Director of Radiology at San Joaquin General Hospital.

Keith Kwok, MD
Keith Kwok, MD
Associate Radiologist and Imaging Protocol Officer
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Keith Kwok, MD

Associate Radiologist and Imaging Protocol Officer

Board Certified Diagnostic Radiologist
Specialized in Neuroradiology
American Board of Radiology

Dr. Keith Kwok joined Rads, Inc. in 2013 after completing a Neuroradiology Fellowship at USC/LAC Medical Center in Los Angeles, California.

Dr. Kwok was born in Hong Kong and is a native of Bellevue, Washington. He graduated with Magna Cum Laude from the University of Washington earning a Bachelor Degree in Biochemistry. He later spent two years at a Howard Hughes Medical Institute neuroscience lab as a research technologist. He attended Medical School at George Washington University School of Medicine in Washington, DC. After earning his MD in 2004, he finished his internship in general surgery at University of California at Davis Medical Center. Dr. Kwok subsequently completed his Radiology Residency at Monmouth Medical Center in Long Branch, New Jersey in 2012.

Throughout his education and medical training, Dr. Kwok has published and presented extensively at national meetings in radiology and neurosurgery. He was co-editor and co-author in the Textbook of Neuro-oncology.

Dr. Kwok is Board Certified in Diagnostic Radiology with a subspecialty in Neuroradiology. He is passionate about his work in radiology and providing the highest level of care to his patients.

Thomas Efird, MD
Thomas Efird, MD
Medical Director of Radiology at Memorial Hospital of Los Banos
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Thomas Efird, MD

Medical Director of Radiology at Memorial Hospital of Los Banos

Board Certified Diagnostic Radiologist
Specialized in Musculoskeletal and Body Imaging
American Board of Radiology

Thomas Efird joined Rads Inc. in 2014. Dr. Efird completed his residency in Diagnostic Radiology at Stanford University Medical Center. He continued his training at Stanford University, completing a combined Musculoskeletal and Body Imaging Fellowship.

A Central Valley native raised in Fresno, Dr. Efird received his undergraduate education at Stanford University, earning a Bachelor of Arts degree in English Literature. He attended medical school at Tulane University School of Medicine, and remained at Tulane for an internship in Internal Medicine. Dr. Efird has earned multiple honors during his career, including induction into the Alpha Omega Alpha honor society and serving as Chief Resident and Chief Body Imaging Fellow at Stanford. Dr. Efird received his Board Certification from the American Board of Radiology in 2009.

Dr. Efird is the Medical Director of Radiology at Memorial Hospital Los Banos

Niv Decalo, MD
Niv Decalo, MD
Associate Radiologist and QA Officer
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Niv Decalo, MD

Associate Radiologist and QA Officer

Board Certified Diagnostic Radiologist
Subspecialty Training in Body Imaging
American Board of Radiology

Dr. Niv Decalo joins Rads Inc. in 2014 after completing a Body Imaging Fellowship at the University of California, San Francisco.

Dr. Decalo graduated with Honors from Brandeis University in 1999 with a Bachelor of Science in Biochemistry. After spending 2 years at the Dana Farber Cancer Institute in Boston, he then attended Tufts University School of Medicine where he earned his Medical Degree in 2005. His training continued with a Surgery Internship at Stamford Hospital in Stamford, CT, followed by Diagnostic Radiology Residency at Hartford Hospital in Hartford, CT.

Dr. Decalo then spent several years in private practice in Connecticut before moving to the West Coast to complete his fellowship at UCSF. Dr. Decalo's work experience as well as his strong educational background and up to date training in Abdominal Imaging make him a welcome addition to Rads, Inc.

Tony Ha, MD
Tony Ha, MD
Medical Director of Radiology at Dameron Hospital
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Tony Ha, MD

Medical Director of Radiology at Dameron Hospital

Board Certified Diagnostic Radiologist
Specialized in Vascular & Interventional Radiology
American Board of Radiology

Dr. Tony Ha joined Rads, Inc. in 2017 after completing a Vascular & Interventional Radiology Fellowship at New York Presbyterian-Weill Cornell Medical Center and Memorial Sloan Kettering Cancer Center in New York, New York.  Dr. Ha is Board Certified in Diagnostic Radiology, and is Board Eligible for certification in Vascular & Interventional Radiology.

Dr. Ha was a Millennium Scholar at the University of California San Diego, graduating Magna Cum Laude with Provost Honors.  He earned Bachelors Degrees in Biochemistry and Psychology.  After completing a year of research at the University of California Davis he returned to UCSD, earning his Medical Degree in 2011.  His training continued with a Surgical Internship and Radiology Residency at Harbor-UCLA Medical Center, where he served as Chief Radiology Resident in 2014.

Dr. Tony Ha currently serves as the Medical Director at Dameron Hospital.

Brian Sakamoto, MD
Brian Sakamoto, MD
Associate Radiologist
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Brian Sakamoto, MD

Associate Radiologist

Specialized in Body Imaging
Board Certified in Diagnostic Radiology

Dr. Brian Sakamoto joined Rads, Inc. in 2017 after completing a Body Imaging Fellowship at Stanford University Medical Center in Palo Alto, CA.  He is Board Certified in Diagnostic Radiology.  

Dr. Sakamoto was a recipient of the Chancellor’s Scholarship and graduated Cum Laude from the University of California Riverside with a Bachelors Degree in Biology.  He earned his Medical Degree from Saint Louis University School of Medicine in St. Louis, MO.  He completed an Internship at Arrowhead Regional Medical Center in Colton, CA, and a Radiology Residency at Saint Louis University Hospital.  Following this training, Dr. Sakamoto served active duty in the 375th Medical Group at Scott Air Force Base in Illinois, serving as the chief of CT and Nuclear Medicine.  He attained the rank of Major.  

Dr. Brian Sakamoto currently serves as the Assistant Medical Director at Dameron Hospital.

Jerel Saito, MD
Jerel Saito, MD
Associate Radiologist
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Jerel Saito, MD

Associate Radiologist

Specialized in Musculoskeletal Radiology and Vascular Interventional Radiology
Member American Board of Radiology

Dr. Jerel Saito, a graduate of Cornell University, received his medical training at the University of Hawaii John A. Burns School of Medicine. He completed his residency in Diagnostic Radiology at the University of California San Francisco-Fresno during which he served as Chief Resident.  He completed a fellowship in Interventional Radiology at the Pittsburgh Vascular Institute and the University of Pittsburgh Medical Center. Dr. Saito also completed additional fellowship training in Musculoskeletal MRI at the University of Maryland Medical Center.

Dr. Saito joined Rads, Inc. in 2017 after practicing radiology in Hawaii for over 17 years.  He has served at many of the major hospitals in the Honolulu area. He brings with him a broad range of experience in diagnostic and interventional radiology.  As part of Rads, Inc., Dr. Saito welcomes the opportunity to continue providing high quality diagnostic services for patients.

Barjinder Sandhu, MD
Barjinder Sandhu, MD
Associate Interventional Radiologist
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Barjinder Sandhu, MD

Associate Interventional Radiologist

Specialized in Vascular & Interventional Radiology
Board eligible, Diagnostic and Interventional Radiology

Dr. Barjinder Sandhu joined Rads, Inc in 2018. Originally from Houston, Texas, Dr. Sandhu completed his vascular and interventional radiology fellowship at the University of Texas Health San Antonio. He also completed his Diagnostic Radiology residency at UT Health San Antonio. He is board eligible in diagnostic and interventional radiology.

Garth Harley, MD
Garth Harley, MD
Diagnostic Neuroradiologist
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Garth Harley, MD

Diagnostic Neuroradiologist

Board Certified Diagnostic Radiologist
Specialized in Neuroradiology
American Board of Radiology

Dr. Harley joined Rads, Inc with an impressive educational background. Dr. Harley graduated from Georgetown University, School of Medicine in 1988. After completing his Internship, in surgery, at California Pacific Medical Center, San Francisco he entered into the Diagnostic Radiology program at Santa Clara Valley Medical Center.

In 1996, Dr. Harley completed his Fellowship training at Stanford University in Neuroradiology. Dr. Harley was also a clinical instructor in Diagnostic Radiology at Stanford University.

Throughout his education, Dr. Harley received several honors in clinical coursework and was named outstanding Intern at California Pacific Medical Center, San Francisco.

Dr. Harley is a commercial, multiengine and instrument rated pilot. He currently holds a world record in large formation skydiving and still remains a current instructor in skydiving.

Since 1999, Dr. Harley has been in private practice, striving to provide quality patient care. Dr. Harley has also previously served as committee member of the Santa Cruz County Medical Review and Advisory Board, as well as Medical Director of Cabrillo College Radiologic Technologist Program.