About Us

Affiliated Faculty

 

Rajiv Chopra

Rajiv Chopra, Ph.D.​

Associate Professor​
Department of Radiology, UT Southwestern​
NE6.252, 214-648-7745​
Rajiv.Chopra@UTSouthwestern.edu
Lab website

Dr. Chopra’s research is concentrated on the development of image-guided therapies. In particular, he has focused on the biomedical applications of high-intensity focused ultrasound (HIFU). Ultrasound is an attractive form of energy for therapeutic use because it can be transmitted through the body from external transducers, can be focused to very localized regions of a few millimeters, and can be generated from devices of multiple geometries ranging from large focused transducers to catheter-based devices. A unique set of capabilities arises when this technology is combined with magnetic resonance imaging (MRI). The ultrasound technology is able to deliver energy within the body noninvasively for applications such as mild heating or tissue ablation, and MRI is able to acquire images of the temperature distribution in the heated tissues during heating. Since the relationship between temperature, time and cell kill is well established, this creates a powerful closed loop method for treating soft tissues.​

The other emerging application of HIFU is to potentiate or enable targeted delivery of agents within the body. Ultrasound can be used to trigger release from temperature-sensitive liposomes, or to noninvasively open the blood/brain barrier. These capabilities offer many possibilities for targeted drug delivery in the brain and other organs with pre-existing vascular barriers (retina, testicles, placenta, etc).​

Dr. Chopra’s research has a preclinical component focused on novel applications of HIFU, and a translational component aimed at evaluating established HIFU approaches in patients.​


 

David Fetzer

David Fetzer, M.D.

Assistant Professor​
Medical Director of Ultrasound​
Director of the CACTUS laboratory
Department of Radiology, UT Southwestern​
E6-230-BF, 214-648-7738
David.Fetzer@UTSouthwestern.edu
Lab website

David Fetzer's complimentary background in imaging science and interest in translational research constitute the basis for his work in multimodality testing and quantitative imaging, particularly in metabolic, hepatobiliary, pancreatic, thyroid, and lymph node imaging.  ​

Dr. Fetzer is also Director of the Collaborative for Advanced Clinical Techniques in Ultrasound (CACTUS), a clinical laboratory drawing upon expertise from radiologists, medical physicists, industry partners, and various medical specialists focused on cutting edge clinical care and establishing an environment for clinical and translational research in ultrasound.​


 

Ken Hoyt

Kenneth Hoyt, Ph.D., M.B.A.

Associate Professor​
Department of Radiology, UT Southwestern​
Department of Bioengineering, UT Dallas​
kenneth.hoyt@utdallas.edu
Lab Website

Dr. Hoyt is trained in acoustics, bioinstrumentation, mathematical modeling, signal and image processing, and medical imaging. He holds a bachelor's degree in electrical engineering, and master's and doctoral degrees in biomedical engineering. His academic training was enhanced by a three-year postdoctoral fellowship at the University of Rochester, where he investigated soft tissue elasticity characterization and imaging of prostate cancer. Dr. Hoyt’s research is focused broadly on the development and use of ultrasound (US) technology for applications related to imaging of diseased tissue, therapy, and drug delivery. This research is categorized by four main pillars described as: Tissue elasticity imaging, quantitative US imaging using microbubble (MB) contrast agents, molecular US imaging, and US-stimulated drug delivery and treatment.​


 

Matthew Lewis

Matthew Lewis, Ph.D.

Assistant Professor​
Department of Radiology, UT Southwestern​
NE6.250, 214-648- 7751​
Matthew.Lewis@UTSouthwestern.edu


 

Shashank Sirsi

Shashank Sirsi, Ph.D. ​

Assistant Professor​
Department of Radiology, UT Southwestern​
Department of Bioengineering, UT Dallas​
Shashank.Sirsi@utdallas.edu​ ​
Lab Website

Dr. Sirsi is an expert in ultrasound contrast agents formulation for imaging and drug delivery applications. He holds bachelor's and doctoral degrees in biomedical engineering. He is adept in designing tailored ultrasound contrast agents for perfusion imaging, molecular imaging, and drug delivery, and has authored several publications and reviews in this field, as well as successfully competed for NIH grant funding. His area of research is highly multidisciplinary and involves collaborations with vascular biologists, ultrasound imaging experts, and radiologists.


 

Abhinav Vij

Abhinav Vij, M.D., M.P.H.

Assistant Professor​
Department of Radiology, UT Southwestern​
E6-230-BD, 214-648-8184
Abhinav.Vij@UTSouthwestern.edu

Abhinav Vij, MD, MPH, is an Assistant Professor of Radiology at UT Southwestern Medical Center and a member of its Abdominal Imaging Division.

Dr. Vij earned his medical degree from one of India’s top ranked medical universities - Maulana Azad Medical College, and then turned his attention to medical research. From a Master of Public Health degree, he acquired epidemiological and statistical skills pivotal for research and subsequently as a research fellow at the Massachusetts General Hospital, contributed to clinical trials on Ultrasound Elastography, Ultrasound Contrast Agents, Computed Tomographic Colonography, post-mortem Computed Tomography and authored multiple manuscripts on these topics. Subsequently, he completed a residency in diagnostic radiology at Main Line Health and a fellowship in abdominal imaging at the Hospital of the University of Pennsylvania.

Dr. Vij is an active member of several national and international professional organizations, including the American College of Radiology, Radiological Society of North America, the American Roentgen Ray Society, the American Institute of Ultrasound in Medicine, the Society of Radiologists in Ultrasound and the World Molecular Imaging Society. He also serves as a reviewer on a number of highly regarded publications, including the American Journal of Roentgenology, Journal of Ultrasound in Medicine, Journal of Magnetic Resonance in Imaging, European Radiology, Journal of Computer Assisted Tomography and Radiography.

His goal is to contribute to healthcare through a productive career rich in clinical work, medical research and teaching. He is interested in discovering new imaging biomarkers for more prompt and accurate diagnoses of abdominal diseases. As a member of the TRUST lab, he is exploring translational applications of ultrasound for doing the same.