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FOCUS
Continued innovations in medical imaging have made the diagnosis
of disease more accurate and its treatment less invasive. It has been
the role of the medical physicist to combine the latest technology with
basic physical principles to create these innovations and evaluate their
impact on patient care. Our research initiatives have involved the investigation
of new imaging technologies, new applications of medical imaging to clinical
problems, and means to monitor and control radiation dose. With the latest
in clinical imaging equipment available, the possibilities for research
investigations are numerous.
SELECTED PROJECTS
- Development and evaluation of a new selenium LCD/CCDdirect digital
medical image receptor for mammography
- Development of a tiled CMOS array-phosphor screen indirect detector
for radiography
- Design and development of an automatic radiation-dose monitoring system
for interventional radiological procedures
- Real-time image processing for brightness equalization during region-of-interest
radiography
- Three-dimensional volume reconstruction from multiple cone-beam projection.
- Image-intensifier distortion characterization and correction
- Blood-flow quantification by tracking radiographic contrast media
using high-resolution biplane digital radiography
- Identification of the optimal features for a digital cardiac-catheterization
imaging system
- Improving methodology to provide quality assurance in medical imaging
- Development of microradiographic imager for neurovascular intervention
PUBLICATIONS
- P. Massoumzadeh, S. Rudin, and D. R. Bednarek. Filter material selection
for region-of-interest radiologic imaging. Medical Physics 25(2):16171
(1998).
- W. E. Granger, D. R. Bednarek, and S. Rudin. Primary beam exposure
outside the fluoroscopic field of view. Medical Physics 24(5):15
(1997).
- M. Kezerashvili, S. Rudin, and D. R. Bednarek. Automatic filter placement
device for region of interest (ROI) fluoroscopy. Health Physics 72(1):14146
(1997).
- D. R. Bednarek and S. Rudin. Increasing the utility of the mammographic
phantom image. Radiology201:57273 (1996).
- D. R. Bednarek, S. Rudin, and R. Wong. Luminance range compression
for video film digitizers. Medical Physics 18(2):198205 (1991).
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Fig.1 In order
to expand the dynamic range of the digitized image of a video camera film
digitizer, luminance range compression can be employed. The LUT transform
curve matches the camera and monitors characteristics to provide the appropriate
compression curve.
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Fig. 2 In region-of-interest
imaging, an X-ray filter reduces raditiation dose and imgae brightness
in the periphery while improving image quality in the center of the field
of view. Image processing using a binary-mask and pipeline processor can
equalize the displayed image brightness in real time for flouroscopic
procedures.
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