Stephen Rudin
Professor in the Departments of Radiology, Neurosurgery, and
Physiology & Biophysics.
Adjunct Professor of Physics.
Medical Physics: Medical Imaging, Radiation and Health Physics
Brief C.V.
- B.S., University of Chicago (1964)
- M.S., University of Chicago (1965)
- Ph.D., City University of New York (1975)
- Physicist, Montefiore Hospital and Medical Center (1968-1977)
Research Interests
Studies in medical physics involve both research into new methods for
imaging with x-rays, gamma rays, ultrasound, radioisotopes, and magnetic
resonance as well as practical training in quality assurance of hospital
based imaging systems and administration of radiation safety programs. As
part of a new multidisciplanary center based on the donation of imaging
equipment worth $3.6 million, we are investigating new imaging detectors,
exposure optimization methods, and means to evaluate 3D neuro-vascular flow.
The new imaging methods will be used to aid in the development and
application of new therapies our group is developing to replace surgical
procedures primarily in the brain with new image-guided, minimally-invasive,
catheter-based treatments. Also, we have quality assurance and radiation
safety responsibilities and access to university teaching hospitals which
provides a practical training ground for graduate students while they pursue
post-graduate research.
Current Projects
- Imaging detectors:
Development of new high resolution solid state x-ray
detectors including amorphous Se for mammography, and a CCD-phosphor system
for high-speed, high-resolution vascular imaging
- Exposure optimization: Region of interest radiography where the beam
is physically modulated in accordance with importance of the imaged feature
while real-time image processing equalizes the brightness of the displayed
information
- Flow quantification: Using bi-plane rapid sequence digital
subtraction radiography, small droplets of contrast media are tracked to
provide 3D flow velocities within vessels
- 3D computed tomography: After x-ray image intensifier images are
corrected for distortion, cone beam data is used for multiple plane 3D
reconstruction
- Hospital and health physics: Quality assurance for radiation sources
and medical image forming systems (radiography, ultrasound, nuclear
medicine/radioisotopes and magnetic resonance imaging) and radiation safety
topics
Recent Publications
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Bednarek DR, Rudin S. Comparison of two dose-area-product (DAP) ionization chambers with different conductive surface coating for
Over-table and Under-table Tube Configurations. Health Phys. 78(3): 316-321, Mar 2000
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Yamada S, Takahashi A, Umazaki H, Honda M, Shiraishi K, Rudin S, Yang C-Y, Bednarek DR. Image quality evaluation of a new
selenium-based flat panel digital X-ray detector system based on animal studies. SPIE vol. 3977: 429-436, 2000
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Rudin S, Nazareth D, Yang C-Y J, Bednarek DR, Chattopadhyay A. Region of interest micro-angiography: imager development. SPIE vol.
3977: 534-541, 2000
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Massoumzadeh P, Rudin S, Bednarek DR. Quantitative Evaluation of Amorphous Selenium (a-Se) for Region of Interest (ROI)
Fluoroscopy. [Cum Laude Award for Scientific Excellence (First Prize, Blue Ribbon)]. SPIE vol. 3977: 658-669, 2000
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Liu R, Rudin S, Bednarek DR. Super-global model for image intensifier distortion. Medical Physics. 26(9): 1802-1810, Sep 1999
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Rudin S; Bednarek DR; Yang CY. Real-time equalization of region-of-interest fluoroscopic images using binary masks.. Med Phys. 26(7):
1359-64, Jul 1999
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Rudin S, Wakhloo AK, Lieber BB, Granger W, Divani A, Bednarek DR, Hopkins LN. Microdroplet tracking using biplane digital substraction
angiography for cerebral arteriovenous malformation blood flow path and velocity determinations. AJNR Am J Neuroradiol.. 20:
1110-1114, Jun 1999
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Yang CJ, Rudin S, Bednarek DR. Variable sampling area for automatic brightness control in digital fluoroscopy. [Cum Laude Award for
Scientific Excellence (First Prize, Blue Ribbon)]. SPIE vol. 3659: 826-832, 1999
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Wakhloo A K;Lieber B B;Rudin S;Fronckowiak M D;Mericle R A;Hopkins L N. A novel approach to flow quantification in brain arteriovenous
malformations prior to enbucrilate embolization: use of insoluble contrast (Ethiodol droplet) angiography.. Journal of Neurosurgery. 89(3):
395-404, Sep 1998
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Massoumzadeh P;Rudin S;Bednarek D R. Filter material selection for region of interest radiologic imaging.. Medical Physics. 25(2): 161-71,
Feb 1998
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Granger W E Jr;Bednarek D R;Rudin S. Primary beam exposure outside the fluoroscopic field of view.. Medical Physics. 24(5): 703-7, May
1997
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Kezerashvili M;Bednarek D R;Rudin S. Automatic system for measuring dose-area product (DAP) in ROI fluoroscopy.. Physics In Medicine
and Biology. 42(4): 613-23, Apr 1997
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Kezerashvili M;Rudin S;Bednarek D. Automatic filter placement device for region of interest (ROI) fluoroscopy.. Health Physics. 72(1):
141-6, Jan 1997
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Bednarek D R;Rudin S. Increasing the utility of the mammographic phantom image.. Radiology. 201(2): 572-3, Nov 1996
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Rudin S;Bednarek D R;Kezerashvili M;Granger W E;Serghany J E;Guterman L R;Hopkins L N;Szymanski B;Loftus R J. Clinical application
of region-of-interest techniques to radiologic imaging.. Radiographics. 16(4): 895-902, Jul 1996
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Rudin S;Guterman L R;Granger W E;Bednarek D R;Hopkins L N. Application of region-of-interest imaging techniques to
neurointerventional radiology.. Radiology. 199(3): 870-3, Jun 1996
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Fletcher L M;Rudin S;Bednarek D R. Method for image equalization of ROI fluoroscopic images using mask localization, selection and
subtraction.. Computerized Medical Imaging and Graphics. 20(2): 89-103, Mar 1996
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Rudin S;Bednarek D R;Guterman L R;Hopkins L N;Wakhloo A K;Fletcher L M;Massoumzadeh P. Implementation of region-of-interest
fluoroscopy by using the road mapping mode of a real-time digital radiographic unit.. Radiographics. 15(6): 1465-70, Nov 1995
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Rudin S;Bednarek D R. Region of interest fluoroscopy.. Medical Physics. 19(5): 1183-9, Sep 1992
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Rudin S;Bednarek D R. Minimizing radiation dose to patient and staff during fluoroscopic, nasoenteral tube insertions.. British Journal of
Radiology. 65(770): 162-6, Feb 1992
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Rudin S;Bednarek D R;Wong R. Accurate characterization of image intensifier distortion.. Medical Physics. 18(6): 1145-51, Nov 1991
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Rudin S;Bednarek D R;Wong R. Improving fluoroscopic image quality with continuously variable zoom magnification.. Medical Physics.
18(5): 972-7, Sep 1991
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Rudin S;Bednarek D R;Wong R. Computer frame freezing of fluoroscopic images.. Radiologic Technology. 62(5): 369-73, May 1991
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Bednarek D R;Rudin S. Blurred-mask density compression for improved reproduction of radiographs.. Investigative Radiology. 26(4):
358-63, Apr 1991
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Bednarek D R;Rudin S;Wong R. Luminance range compression for video film digitizers.. Medical Physics. 18(2): 198-205, Mar 1991
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Rudin S;Bednarek D R;Miller J A. Dose reduction during fluoroscopic placement of feeding tubes.. Radiology. 178(3): 647-51, Mar 1991
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