A5060364281- Radiation Dose and Imaging
- Advanced X-ray and CT Imaging
- Digital Radiography and Breast Imaging
- Radiology practices and education
- Medical Imaging Techniques and Applications
- Advanced Radiotherapy Techniques
- Dental Radiography and Imaging
- Nuclear Physics and Applications
- Photoacoustic and Ultrasonic Imaging
- Advances in Oncology and Radiotherapy
- Advanced Semiconductor Detectors and Materials
- Atmospheric aerosols and clouds
- Global Cancer Incidence and Screening
- Advancements in Photolithography Techniques
- CCD and CMOS Imaging Sensors
- Breast Cancer Treatment Studies
- Optical Polarization and Ellipsometry
- Manufacturing Process and Optimization
- Particle Detector Development and Performance
- Infrared Thermography in Medicine
- Atomic and Subatomic Physics Research
Center for Devices and Radiological Health
1999-2024
United States Food and Drug Administration
1999-2023
Food and Drug Administration
2016
University of Cincinnati
1993-2004
Cincinnati Children's Hospital Medical Center
2004
Background Comprehensive assessments of the frequency and associated doses from radiologic nuclear medicine procedures are rarely conducted. The use these population-based radiation dose increased remarkably 1980 to 2006. Purpose To determine change in per capita exposure United States 2006 2016. Materials Methods U.S. National Council on Radiation Protection Measurements conducted a retrospective assessment for 2016 compared results previously published data year Effective values were...
Purpose: To determine patient radiation doses from interventional cardiology procedures in the U.S and to suggest possible initial values for U.S. benchmarks dose selected [fluoroscopically guided diagnostic cardiac catheterization percutaneous coronary intervention (PCI)]. Methods: Patient metrics were derived analysis of data 2008 2009 Nationwide Evaluation X‐ray Trends (NEXT) survey catheterization. This used deidentified did not require review by an IRB. Data 171 facilities 30 states...
To evaluate trends in mammography quality before and after the implementation of Mammography Quality Standards Act (MQSA) 1992 to compare technical data collected United States with corresponding obtained from first survey facilities conducted 1994-1995 Canada.Data MQSA inspections 1995-1997 were analyzed compared on U.S. acquired MQSA. Technical indicators such as radiation dose phantom image score, film processing, darkroom fog analyzed.In States, scores, along other measures performance...
Purpose: Quality management for any use of medical x‐ray imaging should include monitoring radiation dose. Fluoroscopically guided interventional (FGI) procedures are inherently clinically variable and have the potential inducing deterministic injuries in patients. The a conventional diagnostic reference level is not appropriate FGI procedures. A similar but more detailed quality process dose described. Methods: method that takes into account both inherent variability risk from these...
This paper reports findings from Nationwide Evaluation of X-ray Trends surveys conducted in 2001, 2002, and 2003 clinical facilities that perform routine radiographic examinations the adult chest, abdomen, lumbosacral spine, upper gastrointestinal fluoroscopic examinations. Randomly identified were surveyed approximately 40 participating states. For exams, additional use computed radiography or digital to ensure adequate sample sizes for determining comparative statistics. State radiation...
To determine the average abdominal entrance air kerma, low-contrast sensitivity, and spatial resolution in upper gastrointestinal tract fluoroscopy United States.A random sample of fluoroscopic facilities was selected to be surveyed for Nationwide Evaluation X-ray Trends program. Measurements were performed by using a newly developed phantom. The surveys conducted state radiation control personnel.Average kerma rates 1 cm above tabletop, free air, 43 mGy/min (n = 340). rate increased 64 when...
Abstract Cone‐beam computed tomography (CBCT) systems specifically designed and manufactured for dental, maxillofacial imaging (MFI) otolaryngology (OLR) applications have been commercially available in the United States since 2001 widespread clinical use since. Until recently, there has a lack of professional guidance medical physicists about how to assess evaluate performance these establishment management quality control (QC) programs. The owners users dental CBCT may only rudimentary...
A kinestatic charge detector (KCD) with segmented signal-collection fingers was constructed to evaluate the dual-energy x-ray imaging performance of a KCD. The front segments KCD signal-collectors produce digital low-energy image and back high-energy image. gap between is used as filter increase separation mean energies absorbed in segments. Preliminary measurements have been performed on determine its characteristics. output signal has measured function depth chamber. ion drift velocity,...
We have investigated possible clinical applications of a Kinestatic Charge Detector (KCD) for dual-energy x-ray imaging. The KCD is good candidate as detector radiography, because it digital with high detective quantum efficiency, spatial resolution and scatter rejection. Computer simulations been performed to design optimize KCDs specific applications. that imaging are chest mammography osteoporosis. Experimental data also taken small research KCD.
Results of the 1995 Nationwide Evaluation X-ray Trends (NEXT) survey facilities that perform diagnostic radiographic examinations abdomen and lumbosacral spine were compared with those previous NEXT surveys conducted in 1987 1989. A clinically validated phantom was used to capture data about radiation exposure image quality. Additional obtained regarding clinical techniques, facility workloads, x-ray beam quality, film processing darkroom fog. Mean skin-entrance air kerma for examination...
The performance of commercially available light sensitometers was compared with two other methods x-ray sensitometry to determine whether are viable for evaluating clinical mammography film. X-ray performed using screens that were modified accommodate a graded optical step tablet (screen sensitometry). Finally, means performing intensity-scale configured (inverse-square Clinical exposure conditions used and film processing quality closely monitored during the study. Statistical results...
A small research non imaging kinestatic charge detector (KCD), with segmented signal- collection fingers, has been used to investigate the dual-energy capability of a KCD. The front segments signal-collectors produce digital low-energy x-ray image and back high-energy image. gap between collectors may be as filter increase separation mean energies absorbed in segments. large-field (2016-channel) KCD, without signal-collection also evaluated using two-exposure technique taking two sequential...
A design for a dual-energy Kinestatic Charge Detector (KCD) with segmented charge collection fingers is discussed. The front segment of the KCD collectors will produce digital low-energy image and back segments high-energy image. gap between acts as mid filter to increase separation mean energies absorbed in segments. This was optimized by using computer simulations maximize figure merit defined square signal-to-noise ratio divided average dose. optimal parameters are presented designed...
The feasibility of using a Kinestatic Charge Detector (KCD) for dual-energy chest radiography is investigated. A KCD gas ionization chamber used with scanning slot-beam geometry. Dual-energy imaging involves acquisition two images different mean photon energies which can then be reconstructed suitable algorithm to form basis materials, such as bone and soft-tissue. With KCD, may performed either by taking separate exposures at kVp settings (the dual-kVp method) or single exposure the...