The I-STAR Labs
Imaging for Surgery, Therapy, and Radiology
Johns Hopkins University
Jeffrey H. Siewerdsen, Ph.D.
Professor
Dept. of Biomedical Engineering
Dept. of Computer Science
Russell H. Morgan Dept. of Radiology
Armstrong Institute for Patient Safety and Quality
Johns Hopkins University
Traylor Building, Room 622
720 Rutland Avenue
Baltimore MD 21287
Phone: 443-287-6269
Dr. Jeff Siewerdsen founded the I-STAR Lab as a collaborative endeavor among engineering, physics, and clinical disciplines, such as radiology, surgery, and radiation therapy. He is primary faculty in Biomedical Engineering and Principal Investigator on topics of image quality and cone-beam CT applications in diagnostic and image-guided procedures. He leads a program of interdisciplinary research spanning projects in medical imaging physics, diagnostic radiology, and image-guided interventions. His core interests include the physics of medical imaging, with a focus on advanced x-ray CT and spectral imaging modalities, the mathematics of image quality, the design of novel imaging systems for new applications, and 3D deformable image registration. Strong collaboration with experts in surgery, radiation therapy, and radiology guides and accelerates the translation of new technologies into early clinical application.
J. Webster Stayman, Ph.D.
Associate Professor
Dept. of Biomedical Engineering
Johns Hopkins University
Traylor Building, Room 605
720 Rutland Avenue
Baltimore MD 21287
Phone: 443-955-1314
Dr. Web Stayman is faculty in Biomedical Engineering and Principal Investigator on topics of advanced 3D image reconstruction with applications in diagnostic radiology, and image-guided interventions. With over 15 years of experience in tomography and other imaging applications, his expertise includes both emission tomography and transmission tomography (CT, tomosynthesis, and cone-beam CT). He leads research activities in advanced 3D reconstruction, including model-based statistical / iterative reconstruction, regularization methods, and modeling of imaging systems. He leads development of a generalized framework for penalized likelihood (PL) reconstruction combining statistical models of noise and image formation with incorporation of prior information, including patient-specific prior images, atlases, and models of components / devices known to be in the field of view. His research includes algorithm development and physical experimentation for imaging system design and optimization.
Dr. Wojtek Zbijewski, Ph.D.
Assistant Professor
Dept. of Biomedical Engineering
Johns Hopkins University
Traylor Building, Room 605
720 Rutland Avenue
Baltimore MD 21287
Phone: 443-955-1305
Dr. Wojtek Zbijewski is a physicist whose research interests include x-ray CT image reconstruction, Monte Carlo modeling, and the development and novel imaging systems. He leads activities in imaging system instrumentationthroughout the I-STAR Lab, including cone-beam CT, photon counting CT, and and advanced volumetric imaging for extremities imaging in musculoskeletal radiology, orthopaedics, and rheumatology. He obtained his PhD from University of Utrecht, the Netherlands, under the supervision of Dr. F. Beekman. His background includes the development of statistical reconstruction algorithms for x-ray CT and scatter correction methods for cone-beam CT using accelerated Monte Carlo techniques. His experience includes industrial R&D, where his work involved the design of specialized cone-beam CT systems for image-guided surgery, ENT, and dental applications.
Grace Gang, Ph.D.
Asst. Research Professor
Dept. of Biomedical Engineering
Johns Hopkins University
Traylor Building, Room 605
720 Rutland Avenue
Baltimore MD 21287
Phone: 443-955-1319
Grace Gang is an Asst. Research Professor working on the development of mathematical models of image quality for advanced x-ray imaging systems. Her graduate work involves cascaded systems analysis of tomosynthesis and cone-beam CT– theoretical models combining 3D Fourier metrics (noise-equivalent quanta) with mathematical descriptions of anatomical background and imaging task. Her undergraduate work included deformable registration using mutual information in a dual-energy chest radiography. Her groundbreaking work: demonstrating agreement of theoretical models for 3D detectability with real observer preformance in tomosynthesis and cone-beam CT.
Alejandro Sisniega, Ph.D.
Faculty Research Associate
Dept. of Biomedical Engineering
Johns Hopkins University
Traylor Building, Room 622
720 Rutland Avenue
Baltimore MD 21287
Phone: 443-955-1329
Dr. Sisniega is a Faculty Research Associate 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, dose calculation, and dual-energy imaging. 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.
Ali Uneri, Ph.D.
Faculty Research Associate
Dept. of Biomedical Engineering
Johns Hopkins University
Carnegie Building, Room 780
600 N. Wolfe Street
Baltimore MD 21287
Phone: 443-955-1319
Dr. Ali Uneri is a Faculty Research Associate at Johns Hopkins working on the development and integration of new surgical navigation tools for use in image-guided procedures. His thesis includes the the design and development of the TREK software architecture for intraoperative imaging and surgical guidance, combining 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, and methods for deformable image registration in thoracic surgery. His previous experience includes the development of surgical robotics for knee and hip replacement procedures.
Craig Jones, Ph.D.
Faculty Research Associate
Malone Center for Engineering in Healthcare,
School of Engineering
Carnegie Center for Surgical Innovation,
School of Medicine
Johns Hopkins University
Carnegie Bldg, Room 780
600 N. Wolfe St.
Johns Hopkins Hospital
Baltimore, MD 21287
Phone: 443-955-1319
Dr. Craig Jones is a Faculty Research Associate in the Carnegie Center for Surgical Innovation and the Malone Center for Engineering in Healthcare. He is also a Research Associate in Radiology at the Johns Hopkins University School of Medicine with research focus on image registration and analysis. His work includes advanced methods for deformable image registration, including physics model-based registration (such as LDDMM and Demons algorithms) as well as methods based on deep learning approaches.
Debarghya China , Ph.D.
Postdoctoral Fellow
Dept. of Biomedical Engineering
Johns Hopkins University
Carnegie Building, Room 780
600 N. Wolfe Street
Baltimore MD 21205
Phone: 443-955-1319
Debarghya China is a postdoctoral research fellow in the Department of Biomedical Engineering at Johns Hopkins and is currently working with Dr. Jeffrey H. Siewerdsen, Dr. Kai Ding and Dr. Ali Uneri on intraoperative ultrasound imaging and image analysis. Debarghya has his PhD from Indian Institute of Technology Kharagpur, India on machine learning algorithms for anatomical structure segmentation in clinical ultrasound and their application to high density compression.
Chumin Zhao, Ph.D.
Postdoctoral Fellow
Dept. of Biomedical Engineering
Johns Hopkins University
Traylor Building, Room 624
720 Rutland Avenue
Baltimore MD 21287
Phone: 443-955-1319
Chumin Zhao is a postdoctoral research fellow in the Department of Biomedical Engineering at Hopkins, working on 2D/3D imaging simulations for a versatile twin robotic x-ray imaging system. His research includes development of a system simulation framework and optimization of imaging orbits using advanced system models. His PhD work at the University of Michigan involves thin-film devices, and active pixel sensor x-ray detectors for medical imaging applications. Before joining Hopkins, he worked as a display engineer at Apple.
Niral Sheth
Research Scientist
Dept. of Biomedical Engineering
Johns Hopkins University
Traylor Building, Room 624
Baltimore MD 21287
Phone: 443-955-1319
Niral Sheth is a research scientist in the Department of Biomedical Engineering at Johns Hopkins, working with advanced x-ray detectors. His research includes the characterization of 2D/3D imaging performance of CMOS based flat panel detectors for specific CBCT applications. Niral has his Masters in Electrical Engineering from the University of California, Berkeley with a background in analog circuit and embedded systems design.
Alejandro Lopez Montes, Ph.D.
Postdoctoral Fellow
Dept. of Biomedical Engineering
Johns Hopkins University
Traylor Building, Room 624
Baltimore MD 21287
Alejandro Lopez Montes is a postdoctoral research fellow in the Department of Biomedical Engineering at Johns Hopkins. He is currently working with Dr. Alejandro Sisniega and Dr. Wojtek Zbijewski in the simulation and design of new CBCT scanners. His research interest includes Monte Carlo simulation methods, tomographic image reconstruction algorithms and Deep Learning techniques to improve image quality.
Selam Waktola, Ph.D.
Postdoctoral Fellow
Dept. of Biomedical Engineering
Johns Hopkins University
Traylor Building, Room 624
720 Rutland Avenue
Baltimore MD 21287
Phone: 443-955-1319
Selam Waktola is a postdoctoral research fellow in the Department of Biomedical Engineering at Johns Hopkins, currently working on AI for medical image analysis in image-guided brain surgery and CT-based bone radiomics. His past research work includes building different kinds of machine learning and deep learning models for predicting cancer treatments outcomes based on CT, MRI, and endoscopy imaging at the Netherlands Cancer Institute, Amsterdam.
Research Scientist
Research in 3D image reconstruction and image-guided surgery. Topics include the development and translation of high-quality cone-beam CT for surgical guidance, novel 3D image reconstruction techniques, and deformable image registration.
Jessica Flores is a PhD student in Biomedical Engineering at Johns Hopkins University working with Dr. J. Webster Stayman, PhD. She will be looking at various projects in CT and cone-beam CT, and deciding on a research direction soon.
Heyuan Huang is a PhD student in the Department of Biomedical Engineering at Johns Hopkins University and a research assistant in the I-Star lab, working with Jeffery H. Siewerdsen, PhD. on topics of advanced 3D image reconstruction and registration for interventional procedures. Before joining the I-Star lab, he studied Physics at the University of Illinois, focusing on imaging science of X-ray and PET scans.
Stephen Lui is a PhD student in Biomedical Engineering at Johns Hopkins working with Dr. Wojciech Zbijewski, PhD on the dual-energy KCR for cone-beam CT in presence of surgical hardwares. His previous experience at UC Davis includes scintillator design, DSP, and simulations for the whole-body PET scanner.
Luke is an MD/PhD student in biomedical engineering and visiting scholar from the University of British Columbia. His research focuses on designing tools, developing applications and exploring opportunities of ultrasound-based navigation in spinal surgery. At I-STAR, he is particularly working with optically tracked ultrasound in order to better understand image quality metrics and feature acquisition in the context of the spine. THis research funding is supported both through the Friedman Fellowship for Scholars in Health and through the Alexander Graham Bell award from the National Sciences and Engineering Research Council of Canada (NSERC).
Gengxin Shi is a PhD student of Biomedical Engineering at Johns Hopkins University working with Dr. Wojciech Zbijewski, PhD on quantitative imaging for orthopedics, in particular on dual-energy decomposition to detect bone marrow lesions and on performance assessment of new ultra-high resolution CT in metrics of trabecular microstructure.
Matthew Tivnan
Graduate Student
Dept. of Biomedical Engineering
Johns Hopkins University
Traylor Building, Room 624
720 Rutland Avenue
Baltimore MD 21287
Phone: 443-955-1319
Matthew Tivnan is a PhD student in Biomedical Engineering at Johns Hopkins University working with Dr. J. Webster Stayman, PhD. His research in the AIAI laboratory involves novel methods for collecting and processing spectral CT data for multiple material decomposition.
Wenying Wang
Graduate Student
Dept. of Biomedical Engineering
Johns Hopkins University
Traylor Building, Room 624
720 Rutland Avenue
Baltimore MD 21287
Phone: 443-955-1319
Wenying Wang is a PhD student in Biomedical Engineering at Johns Hopkins University working with Dr. J. Webster Stayman, PhD. Her studies involve advanced acquisition and reconstruction methods for computed tomography including dynamic beam modulation and analysis of imaging properties in real CT and cone-beam CT systems.
Ph.D. Student
Research in 3D image reconstruction and image-guided surgery suitable to a PhD project. Topics include the development and translation of high-quality cone-beam CT for surgical guidance, novel 3D image reconstruction techniques, and deformable image registration.
Ph.D. Student
Research in 3D image reconstruction and image-guided surgery suitable to a PhD project. Topics include the development and translation of high-quality cone-beam CT for surgical guidance, novel 3D image reconstruction techniques, and deformable image registration.
Runze Han is a PhD student in Biomedical Engineering at Johns Hopkins and is currently working with Jeffrey H. Siewerdsen, PhD on deformable image registration for image-guided surgery. His past research includes speckle analysis of X-ray phase contrast lung imaging and arrhythmia detection in cardiac optical mapping.
Yixuan Huang
Graduate Student
Dept. of Biomedical Engineering
Johns Hopkins University
Carnegie Building, Room 780
600 N. Wolfe Street
Baltimore MD 21205
Phone: 443-955-1319
Yixuan Huang is a PhD student in the Department of Biomedical Engineering at Johns Hopkins University. He is currently working with Jeffery H. Siewerdsen, PhD on improving the postoperative assessment of spinal surgery using data-driven approaches. His previous experience at Vanderbilt University includes work in simulation of transcranial focused ultrasound neuromodulation in non-human primates and ultrasound thermometry in fluid environment.
Yixuan Liu is a Master’s student in the Department of Biomedical Engineering at Johns Hopkins University working with Alejandro Sisniega, Ph.D. and Jeffery H. Siewerdsen, Ph.D. on the development of deformable abdominal phantom for motion compensation study during the cone-beam CT acquisition.
Lina Mekki
Graduate Student
Dept. of Biomedical Engineering Johns Hopkins University
Carnegie Building, Room 780
Baltimore MD 21287
Lina Mekki is a PhD student in the Department of Biomedical Engineering at Johns Hopkins University. She is currently working with Dr. Siewerdsen and Dr. Uneri on surgical applications of Deep Learning. Her previous experience at King’s College London includes the development of an open-source tool for the automatic segmentation of retinal layers and fluid from OCT scans.
Corey Simmerer
Graduate Student
Dept. of Biomedical Engineering
Dept. of Computer Science
Johns Hopkins University
Carnegie Building, Room 780
600 N. Wolfe Street
Baltimore MD 21205
Phone: 443-955-1319
Corey Simmerer is a PhD student in Biomedical Engineering at Johns Hopkins University. He is currently working with Drs. Uneri and Siewerdsen on automated planning for treatment of orthopedic dislocations and fractures using 3D statistical shape modeling. Prior to joining the I-STAR Lab, he studied BME and ECE at Duke University, and his undergraduate research experience included multimodal image registration of ophthalmic images.
Prasad Vagdargi is a PhD student in Computer Science at Johns Hopkins and is currently working with Jeffrey H. Siewerdsen, PhD on image-guided surgical robotics for pelvic procedures. His current research integrates tracking and localization based on computer vision with prior medical imaging for K-Wire insertion. Another aspect of his research involves surgical outcome prediction of spinal procedures using interpretable machine learning/deep learning methods. His past research during his MSE in Robotics included development of AR/Vision systems for thoracic procedures, and Vision systems for automated microdissection amongst other work.
Pengwei Wu is a PhD student in the Department of Biomedical Engineering at Johns Hopkins University and a research assistant in the I-STAR Lab. His research includes development of advanced 3D imaging algorithm and artifacts elimination (including cone beam artifacts) strategy etc. His previous experience at Zhejiang University includes work in shading correction algorithm and related reconstruction method in computed tomography.
Ph.D. Student
Research in 3D image reconstruction and image-guided surgery suitable to a PhD project. Topics include the development and translation of high-quality cone-beam CT for surgical guidance, novel 3D image reconstruction techniques, and deformable image registration.
Ph.D. Student
Research in 3D image reconstruction and image-guided surgery suitable to a PhD project. Topics include the development and translation of high-quality cone-beam CT for surgical guidance, novel 3D image reconstruction techniques, and deformable image registration.
Yicheng Hu is a PhD student in the Department of Computer Science at Johns Hopkins University working with Dr. Siewerdsen and Dr. Sisniega on topics of deep learning for 3D image reconstruction and registration. His current research integrates realistic simulation of CBCT imaging and development of artificial neural network models for motion compensation. Before joining I-STAR, he was a MSE student in Robotics at Johns Hopkins University working with Dr. Mathias Unberath on generalization of neural networks.
Junyuan Li is a Master’s student in Biomedical Engineering at Johns Hopkins working with Dr. J. Webster Stayman, PhD on the development CT image quality phantoms using 3D printing for assessment of image textures.
Alex Lu
Graduate Student
Dept. of Biomedical Engineering Johns Hopkins University
Carnegie Building, Room 780
Baltimore MD 21287
Phone: 410-955-1309
Alex Lu is an MD-PhD student in the BME program interested in the intersection of machine learning and biomechanics in surgical applications. He is currently working with Dr. Siewerdsen on pulmonary interventions. He was previously at Stanford, working on computational thermodynamics and patient-specific blood flow modeling.
Maximilian Rohleder (M.Sc.) is a visiting researcher from Erlangen, Germany. He is conducting his doctoral research in a collaboration between Friedrich-Alexander-University (FAU) and Siemens Healthineers. He joins I-STAR for the Summer ‘22 to investigate the Metal Artefact Avoidance system building on previous efforts by I-STAR and Siemens. Max studied Medical Engineering at FAU and the University of Lisbon (Instituto Superior Técnico) and conducted his Bachelor levels research at Stanford University. His research interests include Dual Energy CT, the simulation of realistic X-Ray data and integration of reconstruction operators in Neural Network architectures.
Aina Tersol is a Master's student in the Department of Biomedical Engineering at Johns Hopkins University. Aina works with Dr. Siewerdsen on quantifying 3D image quality and sampling effects associated with cone-beam CT artifacts. She also is developing neural network solutions for image segmentation, including projects in the “Radiology for Engineers” course at Hopkins BME.
Rohan Vijayan
Graduate Student
Dept. of Biomedical Engineering
Johns Hopkins University
Carnegie Building, Room 780
600 N. Wolfe Street
Baltimore MD 21287
Phone: 410-955-1319
Rohan Vijayan is a PhD student in the Department of Biomedical Engineering at Johns Hopkins University. He is currently working with Jeffrey H. Siewerdsen, PhD on automatic planning of spinal pedicle screw trajectories to 1) improve the workflow and precision of robot-assisted spinal surgery and 2) perform retrospective analysis of surgical quality and outcomes in large image datasets. Before joining I-STAR, his previous research experience includes Android app development for preoperative planning of brain tumor resection procedures.
Esme Zhang
Research Scientist
Dept. of Biomedical Engineering Johns Hopkins University
Carnegie Building, Room 780
Baltimore MD 21287
Phone: 410-955-1309
Esme (Xiaoxuan) Zhang is a research scientist in the Department of Biomedical Engineering at Johns Hopkins University, working on technical development and clinical translation of advanced reconstruction methods. Her research includes enhancement of intraoperative 3D images for soft-tissue assessment and quality assurance of surgical products (rods and screws, etc.). Her master’s thesis focused on the development of models and reconstruction methods for multi-row dectector cardic CT, including the application of motion correction methods and known-component reconstruction methods for cardiac implants.
MaryJo (MJ) Bostic
Sr. Administrative Coordinator
Dept. of Biomedical Engineering
Johns Hopkins University
Carnegie Building, Room 780
Baltimore MD 21287
Phone: 410-955-6378
MJ Bostic is the Sr. Administrative Coordinator for the Carnegie Center of Surgical Innovation. She is the primary point of contact for Dr. Siewerdsen as well as scheduling, general operations, and other administrative matters related to the Center.
Ashley Johnston
Research Technician & Teaching Assistant
Dept. of Biomedical Engineering
Johns Hopkins University
Carnegie Building, Room 780
Baltimore MD 21287
Phone: 410-955-6378
Ashley Johnston is a Lab Technician and Teaching Assistant for the Carnegie Center for Surgical Innovation. She works with Dr. Siewerdsen on the "Radiology for Engineers" and "Surgineering" courses as well as assisting on research projects in image-guided surgery. Ashley received her bachelor's in Mechanical Engineering and is completing her MBA and Masters in Biomedical Engineering at Johns Hopkins University with the goal of attending medical school. Prior to Johns Hopkins, Ashley was a Business Team Manager at Rogue Fitness prior to working in industrial and manufacturing engineering roles in the semiconductor and robotics industries. Ashley is also a retired professional ice hockey player, serving as team captain during her tenure in the NWHL and winning the Isobel Cup in her final season.
Matthew Fernandez
Research Technician
Dept. of Biomedical Engineering
Johns Hopkins University
Carnegie Building, Room 780
Baltimore MD 21287
Phone: 410-955-6378
Matthew Fernandez is a Lab Technician and Teaching Assistant for the Carnegie Center for Surgical Innovation. He works with Dr. Siewerdsen on the "Radiology for Engineers" course as well as assisting on research projects related to image-guided surgery. Matthew received his bachelor's and Master's degrees in Biomedical Engineering at Johns Hopkins University with a focus on imaging and medical devices.
Ryan Stewart
Research Program Supervisor
Dept. of Biomedical Engineering
Johns Hopkins University
Carnegie Building, Room 780
Baltimore MD 21287
Phone: 410-955-6378
Ryan Stewart is the Research Program Supervisor for the Carnegie Center of Surgical Innovation. He is the primary point of contact for Dr. Siewerdsen as well as responsible for the 3D Printing Facility, and developing infrastructure for the Carnegie Center.
William Anderson, M.A., M.D., Ph.D.
Associate Professor
Dept. of Neurosurgery
The Johns Hopkins Hospital
Sheikh Zayed Tower
1800 Orleans St.
Baltimore MD 21287
Phone: 443-287-4561
Dr. William Anderson is also a member of the Epilepsy Surgery team, and performs both resectional procedures such as temporal lobectomy, diagnostic procedures such as implantation of monitoring grids and depth electrodes, and therapeutic neuromodulation using vagal nerve and cortical stimulation. Procedures for pain and spasticity performed include intrathecal baclofen therapy and spinal cord stimulation therapy.
Alan Cohen, M.D.
Director
Pediatric Neurosurgery
Professor
Dept. of Neurosurgery
The Johns Hopkins Hospital
Johns Hopkins Outpatient Center
601 N. Caroline St
5th Floor, Neurosciences Clinic
Baltimore, MD 21287
Phone: 410-955-7337
Dr. Cohen is the director of the Johns Hopkins Division of Pediatric Neurosurgery and the Carson-Spiro Professor of Pediatric Neurosurgery. He treats all pediatric patients, with a focus on brain tumors. Dr. Cohen sees patients at the Johns Hopkins Outpatient Center’s Neurosciences Clinic. He is a leader in developing minimally invasive techniques to enhance the safety and efficacy of selected pediatric neurosurgical procedures. To that end, his lab focuses on new instruments and techniques for minimally invasive surgery. He has authored 170 peer-reviewed journal articles and book chapters, and published two textbooks.
A. Jay Khanna, M.D.
Professor
Dept. of Orthopaedic Surgery
Johns Hopkins University
Good Samaritan Hospital
5601 Loch Raven Blvd, Room G-1
Baltimore, MD 21239
Phone: 443-444-4538
Dr. Jay Khanna is a Professor of Orthopaedic Surgery and Biomedical Engineering at the Johns Hopkins University. He is a spine surgeon with fellowship training in both orthopaedic and neurologic spine surgery. His clinical practice is based in the Washington DC region at the Suburban Hospital where he serves as Division Chief of Johns Hopkins Orthopaedic Surgery in the National Capital Region. Dr. Khanna enjoys all aspects of spine surgery although his clinical and research areas of interest lie in the sub-fields of minimally invasive spine surgery and spinal deformities such as scoliosis. In addition to his clinical expertise and leadership in the field of spine surgery, he leads research and entrepreneurial partnerships throughout Johns Hopkins, including his role as prior Clinical Director of the CBID (Center for Bioengineering, Innovation and Design) Program. He works closely with the I-STAR Lab in the development of C-arm cone-beam CT for image-guided spine surgery, evaluation of surgical workflow, minimization of radiation dose, and translation to clinical application in orthopaedic surgeries.
Joao A C Lima, M.B.A., M.D.
Director
Cardiovascular Imaging
Professor
Dept. of Medicine
Johns Hopkins Hospital
600 N. Wolfe Street
Blalock 524
Baltimore, MD 21287
Phone: 410-955-5115
Dr. Joao Lima is a professor of medicine, radiology and epidemiology at the Johns Hopkins School of Medicine. His pioneering work in cardiac imaging using advanced MRI, CT and echocardiography has led to noninvasive techniques for predicting cardiovascular disease and calculating its extent, as well as measuring the effectiveness of modern cardiac treatments. He holds numerous patents on devices and methods for cardiac imaging and image-guided therapies.
Greg Michael Osgood, M.D.
Chief
Dept. of Orthopaedic Surgery
Assistant Professor
Dept. of Orthopaedic Surgery
Johns Hopkins Hospital
601 N. Caroline St.
Baltimore, MD 21287
Phone: 443-997-2663
Dr. Greg Osgood is an assistant professor of orthopaedic surgery at the Johns Hopkins School of Medicine and Chief of Orthopaedic Trauma for the Department of Orthopaedic Surgery. His areas of expertise include orthopaedic trauma, with a special focus on fracture non-unions, pelvis and acetabular injuries, and fractures and surgical infections.
Katsuyuki (Ken) Taguchi, Ph.D.
Associate Professor
Dept. of Radiology
Johns Hopkins University
Phone: 433-287-2974
Dr. Ken Taguchi is recognized leader in the field of CT image science, 3D / 4D image reconstruction, CT data acquisition, photon counting, and spectral CT. He is among the pioneers of multi-detector CT (MDCT) in the 1990s and leads a vibrant program of research in advanced CT imaging technologies. Dr. Taguchi’s collaboration with I-STAR includes the development of new photon counting detector systems for CT and spectral CT, including the development of new experimental systems for photon counting CT and new algorithms for high-quality dual-energy CT decomposition. More information: Division of Medical Imaging Physics (DMIP)
John Wong, Ph.D.
Professor
Director of Medical Physics
Johns Hopkins Hospital
Weinberg Building
401 N Broadway Street
Baltimore MD 21287
Phone: 410-502-1458
Dr. Wong’s clinical research interests focus on the development advanced radiation treatment techniques to improve tumor eradication while minimizing radiation-induced toxicity. He is on the invention team of the Active Breathing Control device to manage breathing motion during treatment, as well as Cone-beam CT (CBCT) with a flat panel imager on board a medical accelerator to facilitate CT guided radiation treatment. More recently, he has been exploring the use of on-board 3D ultrasound and CBCT as the surrogate imaging methods to bring multi-modality imaging information, such as MRI, to guide radiation treatment.
Nafi Aygun, M.D.
Associate Professor
Dept. of Radiology
and Radiological Science
The Johns Hopkins Hospital
Sheikh Zayed Tower
600 N. Wolfe Street
Baltimore MD 21287
Phone: 410-955-6500
Dr. Aygun is an Associate Professor in the Johns Hopkins Medicine Department of Radiology and Radiological Science. He specializes in neuroradiology, diagnostic radiology and head and neck imaging. His research includes the development of novel imaging methods for detection and monitoring of traumatic brain injury, including a new brain imaging system under development at the I-STAR Lab in collaboration among Radiology, Biomedical Engineering, and Neurology.
Shadpour Demehri, M.D.
Assistant Professor
Dept. of Radiology
and Radiological Science
The Johns Hopkins Hospital
Sheikh Zayed Tower
600 N. Wolfe Street
Baltimore MD 21287
Phone: 410-955-6500
Dr. Demehri is an Assistant Professor in the Johns Hopkins Medicine Department of Radiology and Radiological Science specializing in in diagnostic radiology and musculoskeletal (MSK) radiology, with training also nuclear radiology and noninvasive cardiovascular imaging. His research collaboration with the I-STAR Lab includes the development and translation of a new high-quality cone-beam CT system dedicated to imaging of the extremities. His work includes the translation of new imaging methods for diagnosis and monitoring in areas of orthopaedics, trauma, and rheumatology.
Dara L. Kraitchman, M.S., Ph.D., V.M.D.
Section Head
Cardiovascular Interventional
Professor
Dept. of Radiology and Radiological Science
Johns Hopkins University
Department of Radiology
600 N. Wolf Street, Park 311
Baltimore, MD 21287
Phone: 410-955-6500
Dr. Dara Kraitchman is a Professor in the Johns Hopkins Medicine Department of Radiology and Radiological Science. Her research focuses on non-invasive imaging and minimally invasive treatment of cardiovascular disease. Dr. Kraitchman serves as the Cardiovascular Interventional Section Head within the department. Dr. Kraitchman is also co-Director of the Center for Image-Guided Animal Therapy(CIGAT), which provides state-of-the-art imaging and minimally invasive diagnostic and therapeutic options for pets as well as veterinary clinical trials.
Mark Luciano, M.D., Ph.D.
Director
Cerebral Fluid Center
Professor
Dept. of Neurosurgery
Johns Hopkins Hospital
600 N. Wolfe Street
Phipps Suite 126
Baltimore, MD 21287
Phone: 410-955-7482
Dr. Mark Luciano is the director of the Johns Hopkins Cerebral Fluid Center. A renowned leader in treating hydrocephalus, Dr. Luciano is distinguished both nationally and internationally for his research and educational and clinical work in neuroendoscopy.
He treats adults with hydrocephalus, pseudotumor cerebri, intracranial hypotension, Chiari malformations, and cerebral and spinal cysts. He has significant expertise treating children and adults with cerebrospinal fluid leaks and congenital disorders.
Babar Shafiq, M.D., M.S.
Director
Orthopaedic Bone Health Center
Assistant Professor
Dept. of of Orthopaedic Surgery
Johns Hopkins Hospital
601 N. Caroline St.
Baltimore, MD 21287
Phone: 443-997-2663
Dr. Babar Shafiq is a board certified, fellowship trained orthopaedic surgeon who specializes in orthopaedic traumatology. As an Assistant Professor of Orthopaedic Surgery at the Johns Hopkins University School of Medicine and the Johns Hopkins Hospital, Dr. Shafiq cares for patients with challenging acute injuries and a wide variety of chronic problems secondary to trauma.
Nicolas Theodore, M.D.
Director
Neurosurgical Spine Center
Professor of Neurosurgery
The Johns Hopkins Hospital
600 N. Wolfe Street
Baltimore, MD 21287
Nicholas Theodore, M.D., director of the Johns Hopkins Neurosurgical Spine Center, is a nationally recognized expert in brain and spinal cord injury, minimally invasive spine surgeries and robotics. As an award-winning teacher and researcher, Dr. Theodore has written or co-authored 30 book chapters, over 180 peer-reviewed journal articles and is co-holder of 10 patents for medical devices and procedures. His research focuses on trauma, spinal cord injuries, robotics and developing an understanding of the genetic and molecular basis of spinal diseases. Dr. Theodore was also the founder and Chief Medical Officer of Excelsius Surgical, a company focusing on next generation image-guided robotics for use in surgery and medicine. His company was acquired by Globus Medical in January 2014.
John Carrino, M.D.
Associate Professor
Dept. of Radiology
and Orthopaedic Surgery
Johns Hopkins Hospital
JHOC 5165
601 N. Caroline Street
Baltimore MD 21287
Phone: 443-287-6032
Dr. John Carrino is Section Chief of Musculoskeletal Radiology at Johns Hopkins University. He received his MD from Geoge Washington University and MPH from the Harvard School of Public Health. His core interests include spine imaging, novel MR imaging techniques, health services research, and radiology informatics. He is involved in a number of collaborative projects, notably in the field of musculoskeletal diagnostic imaging. He collaborates closely with the I-STAR Lab in the development of a dedicated cone-beam CT system for extremities imaging, a system for high-quality portable dual-energy imaging for the ICU, and in image quality analysis, ROC studies, and CT dosimetry.
Kelvin Kai-wen Hong, M.B.B.Ch., M.B.B.S.
Divisional Director
Interventional Radiology
Associate Professor
Dept. of Radiology and Radiological Science
Johns Hopkins Hospital
1800 Orleans Street
Sheikh Zayed Tower
Baltimore, MD 21287
Phone: 443-287-2916
Dr. Kelvin K. Hong is an Assistant Professor in the Johns Hopkins Medicine Division of Interventional Radiology within the Department of Radiology and Radiological Science. A specialist in interventional and vascular radiology, Dr. Hong serves as the Medical Director of the Johns Hopkins Interventional Radiology Center.
Sheng-Fu (Larry) Lo, M.D.
Assistant Professor
Dept. of Neurosurgery
Johns Hopkins Hospital
600 N. Wolfe Street
Baltimore MD, 21287
Dr. Sheng-fu “Larry” Lo is a neurosurgeon specializing in primary and metastatic tumors of the spinal column, sacral tumors, spinal cord tumors, disorders of spinal alignment and degenerative spine disease.
His research focuses on understanding the biology and clinical outcomes of spinal tumors, and new surgical procedures and innovative technology to improve patient safety and spinal fusion. His research has received numerous awards including the Neurosurgery Chairman’s Award for Improving Patient Safety.
Mahadevappa Mahesh, Ph.D.
Associate Professor
Chief Physicist
Dept. of Radiology
Johns Hopkins University
JHOC Suite 4235
601 N Caroline Street
Baltimore, MD 21287-0856
Phone: 410-955-5115
Dr. Mahadevappa Mahesh, MS, PhD, FAAPM, FACR, is Associate Professor of Radiology in the Division of Cardiology at the Johns Hopkins University School of Medicine. As Chief Physicist at the Johns Hopkins Hospital, he oversees the quality assurance program for Diagnostic Radiology, including compliance with state and federal regulations and ensuring safe use of radiation to patients. He is a recognized expert in the field of radiation dosimetry and regularly provides counsel to patients regarding radiation exposure concerns. His research interests include multiple-detector computed tomography (MDCT), interventional fluoroscopy, and digital mammography. He collaborates closely with the I-STAR Lab in the development of advanced 3D imaging systems, dual-energy radiography systems, novel imaging phantoms, and the minimization of radiation dose.
Robert Stevens, M.D.
Associate Professor
Dept. of Anesthesiology and Critical Care Medicine
Johns Hopkins Hospital
600 N. Wolfe Street
Phipps Building, 455A
Baltimore, MD 21287
Phone: 410-955-7481
Dr. Stevens is fellowship-trained and board-certified in critical care medicine, neurocritical care, and anesthesiology. He treats patients with critical illnesses such as sepsis, ARDS, acute kidney injury, traumatic brain injury, and stroke. He has special expertise in the resuscitation of patients after cardiac arrest. Following medical studies, Dr. Stevens received postdoctoral research training in molecular neurobiology, cellular electrophysiology, advanced magnetic resonance imaging, and brain mapping. He holds faculty appointments in the Johns Hopkins Institute for Cell Engineering, Institute for Computational Medicine and the FM Kirby Center for Functional Neuroimaging. Dr. Stevens is on the Council of the European Society of Intensive Care Medicine and chairs the Committee on Computational Critical Care Medicine at the SCCM. He is an Associate Editor of the journal Thorax, and serves on the Editorial Boards of Critical Care Medicine, Neurocritical Care, and Frontiers in Neurology.
Clifford Raabe Weiss, M.D.
Medical Director
The Johns Hopkins Center for Bioengineering, Innovation and Design (CBID)
Associate Professor Dept. of Radiology and Radiological Science
The Johns Hopkins Hospital
1800 Orleans Street
Sheikh Zayed Tower
Baltimore, MD 21287
Phone: 410-614-1046
Dr. Clifford Weiss is an Associate Professor of Radiology and Radiological Science. He also holds appointments in Surgery and Biomedical Engineering. Additionally, he serves as Medical Director of the Johns Hopkins Center for Bioengineering Innovation and Design (CBID).
His clinical focus lies in vascular and interventional radiology. He specializes in the diagnosis and treatment of vascular malformations, including pulmonary arteriovenous malformations and hereditary hemorrhagic telangiectasia; varicoceles; MRI-guided interventions, especially for the treatment of vascular malformations; advanced venous interventions; and advanced biliary interventions.