Scanning system for chest radiography with regional exposure control: practical implementation

Journal Article · · Med. Phys.; (United States)

DOI:https://doi.org/10.1118/1.595333· OSTI ID:6749011

Plewes, D B; Vogelstein, E

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 5s or a spot of radiation scanned over two dimensions in a raster pattern in 8.8s. 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. Measurement 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: Univ. of Rochester Medical Center, New York
• OSTI ID: 6749011
• Journal Information: Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 10:5; ISSN MPHYA
• Country of Publication: United States
• Language: English

Related Subjects

550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
AUGMENTATION
BEAM OPTICS
BIOMEDICAL RADIOGRAPHY
BODY
BODY AREAS
CHEST
CONTROL SYSTEMS
DIAGNOSTIC TECHNIQUES
IMAGES
MEDICINE
MOCKUP
NUCLEAR MEDICINE
PHANTOMS
RADIOLOGY
SCATTERING
STRUCTURAL MODELS