Research Faculty, Fellows, and Staff

Research Scientist
Department of Biomedical Engineering

Johns Hopkins University
Traylor Building, Room 622
720 Rutland Avenue
Baltimore MD 21205

Phone: 410-955-1329

Dr. Sisniega is a postdoctoral research fellow at the I-STAR Lab in the Department of Biomedical Engineering at Johns Hopkins University and an expert in 3D imaging, models, and simulation. His research includes the development of high-performance Monte Carlo simulation methods for 3D imaging, including GPU implementations for high-fidelity, high-speed x-ray scatter simulation and dose calculation, as well as advanced artifact correction and motion compensation algorithms for cone-beam CT. His background includes the development of novel 3D imaging systems for preclinical imaging and integration of multiple imaging modalities, including molecular imaging and cone-beam CT.

Graduate Research Assistant
Department of Computer Science

Johns Hopkins University
Carnegie Building, Room 780
720 Rutland Avenue
Baltimore MD 21205

Phone: 410-502-7721

Dr. Ali Uneri is a computer scientist at the I-STAR Lab working on the design and development of novel computer architectures and image registration methods for image-guided interventions. His work includes development of the TREK software architecture for intraoperative imaging and surgical guidance, which combines open-source 3D Slicer and CISST libraries for surgical navigation based on intraoperative cone-beam CT. His core research includes the development of fast 3D-2D registration and high-quality 3D image reconstruction methods for surgical guidance. He also works on novel surgical tracker configurations, real-time thoracoscopic video augmentation, methods for deformable image registration, and development of surgical robotics. Dr. Uneri earned his PhD in Computer Science at Hopkins on the development and integration of new surgical navigation tools for use in image-guided procedures.

Postdoctoral Research Fellow
The Spinal Fusion Laboratory
Department of Neurosurgery

Johns Hopkins University
Carnegie Building, Room 780
1798 East Monument Street
Baltimore, MD 21287

Cristina Holmes (BASc & MASC, University of Toronto, PhD McGill University) is a Postdoctoral Research Fellow at the Spinal Fusion Laboratory  studying various strategies for improving fusion surgery outcomes including: delivery of growth factors and biological agents; stem cell therapies; and tissue engineering approaches. Christina has extensive research experience encompassing work with embryonic stem cells, mesenchymal stem cells, animal models, biomaterials characterization and development, tissue engineering, biomedical imaging modalities, biomechanical testing, and drug and gene delivery.

Postdoctoral Research Fellow
Biophotonics Imaging Technology Lab
Department of Biomedical Engineering

Johns Hopkins Hospital
Carnegie Building, Room 750
1798 East Monument Street
Baltimore, MD 21287

Dr. Dawei Li is a Postdoctoral Research Fellow at the Biophotonics Imaging Technology Lab (BIT)  His research interests include advanced endomicroscopy technologies and biomedical applications.

Research Technologist
Department of Biomedical Engineering

Johns Hopkins University
Carnegie Building, CA780
Baltimore MD 21287

Xiaoxuan Zhang (Esme) graduated with a master's degree in Biomedical Engineering at Johns Hopkins in 2016. She is currently working at the I-STAR and AIAI labs as a research technologist. One of her projects focuses on the simulation of High-Intensity Focused Ultrasound (HIFU) therapy for treating brain tumors, and the other on the development of reconstruction methods for eliminating metal and motion artifacts in Cardic CT.

Postdoctoral Research Fellow
Biophotonics Imaging Technology Lab
Department of Biomedical Engineering

Johns Hopkins Hospital
Carnegie Building, Room 750
1798 East Monument Street
Baltimore, MD 21287

Dr. Hyeon-Cheol Park is a Postdoctoral Research Fellow at the Biophotonics Imaging Technology Lab (BIT)  His research interests include microscanning and endoscopy technologies, high resolution linear and nonlinear imaging, and biomedical applications.

Research Scientist
Department of Biomedical Engineering

Johns Hopkins University
Traylor Building, Room 624
720 Rutland Avenue
Baltimore MD 21205

Phone: 410-502-7721

Joseph Goerres is a postdoctoral research fellow at the I-STAR Lab in the Department of Biomedical Engineering at Johns Hopkins. He works on the development of novel intraoperative approaches in order to facilitate image-guided orthopedic interventions and improve their accuracy. His research interests include image segmentation, shape modeling, object detection, and investigating the applicability of these methods for intraoperative C-arm imaging. His background covers 3D shape model segmentation and feature detection in the context of orthopedic treatments at the lower ankle joint.

Research Scientist

Johns Hopkins University
Carnegie Building, Room 780
1798 East Monument Street
Baltimore MD 21287

Phone: 410-502-7721

Research Engineer
Department of Biomedical Engineering

Johns Hopkins University
Carnegie Building, CA780
Baltimore MD 21287

Niral Sheth is Research Engineering Staff at the I-STAR Lab and Carnegie Center for Surgical Innovation at Johns Hopkins University. His research involves investigation of advanced x-ray detectors for high-performance cone-beam CT in diagnostic imaging and image-guided procedures. His work includes the use of emerging CMOS detector technologies offering increased spatial resolution, higher readout rate, and reduced electronic noise. Niral has a Master’s Degree in Electrical Engineering from UC Berkeley and a Bachelor’s Degree from Duke University. His interests include analog circuit and embedded system design, biomedical instrumentation, and machine learning.

Neurosurgery resident at Johns Hopkins University School of Medicine

The Johns Hopkins Hospital
600 N. Wolfe Street
Baltimore, MD 21287

Dr. Rajiv Iyer is a 5th year resident at the Johns Hopkins Neurosurgery residency program. He received his B.S in Neural Science with a minor in Music at New York University in 2007. He subsequently completed his medical training at New York University School of Medicine in 2012. During medical school, Dr. Iyer spent a year as part of the Howard Hughes Medical Institute-National Institutes of Health (HHMI-NIH) Research Scholars Program. During his time at the NIH, he evaluated drug delivery techniques to the central nervous system, including convection-enhanced delivery. He also investigated tumor pathophysiology in inherited neoplasia syndromes. Dr. Iyer is pursuing a career in pediatric neurosurgery, with specific interests in neurosurgical oncology and spinal disorders in children. His research includes minimally invasive neurosurgical approaches and device development.