Scanning system for chest radiography with regional exposure control: Practical implementation
An experimental scanning apparatus for chest radiography is described which offers good scatter rejection and regional manipulation of film exposure. The apparatus is capable of studying two scanning geometries that uses either a fan of radiation swept laterally over the film in 5 s or a spot of radiation scanned over two dimensions in a raster pattern in 8.8 s. The manipulation of tube output during the scan is achieved by pulse width modulation with film exposure monitored by a fluorescence detector placed behind the film cassette. Measurements of the scatter rejection properties of the system show that it is superior to that of a 10:1 grid when used with 120-kVp radiation. Phantom images with both geometries demonstrate the capability of the system to improve uniformity of film exposure and soft tissue contrast throughout the mediastinal, diaphragmatic, and retrocardiac areas. The relative characteristics of the one- versus two-dimension scan geometries are given. Clinical raster images formed with the 8.8-s scan time show signs of motion unsharpness which becomes insignificant when the scan time is reduced to 4.5 s.
- Research Organization:
- Department of Diagnostic Radiology, University of Rochester Medical Center, Rochester, New York 14642
- OSTI ID:
- 5592879
- Journal Information:
- Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 10:5; ISSN MPHYA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
655003* -- Medical Physics-- Dosimetry
BIOMEDICAL RADIOGRAPHY
BODY
DIAGNOSTIC TECHNIQUES
DOSES
DOSIMETRY
IMAGES
LUNGS
MEDICINE
MOCKUP
NUCLEAR MEDICINE
ORGANS
PHANTOMS
RADIATION DOSE DISTRIBUTIONS
RADIATION DOSES
RADIOLOGY
RESPIRATORY SYSTEM
SPATIAL DOSE DISTRIBUTIONS
STRUCTURAL MODELS
X-RAY DOSIMETRY