Exposure artifacts in raster scanned equalization radiography
The image artifacts characteristic of a scanning chest radiographic system are reviewed. The technique employs a pulsed beam of radiation swept in an overlapping raster pattern that can result in severe ripple and scan line artifacts with improper scanning parameters. A one-dimensional treatment of the scanner geometry shows that the artifacts can be eliminated when the beam width is an integral multiple of interpulse spacing. An extension to a two-dimensional analysis indicates that with the collimator geometries employed, artifact-free images are not possible with a fixed x-ray frequency but can be achieved when a variable frequency source is used. A treatment of the sensitivity for artifact formation shows that with proper choice of scanning parameters sizable errors in beam width can be tolerated without significant artifact formation.
- Research Organization:
- Univ. of Rochester Medical Center, NY
- OSTI ID:
- 6132378
- Journal Information:
- Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 11:2; ISSN MPHYA
- Country of Publication:
- United States
- Language:
- English
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62 RADIOLOGY AND NUCLEAR MEDICINE
BEAM PROFILES
BIOMEDICAL RADIOGRAPHY
COLLIMATORS
DIAGNOSTIC TECHNIQUES
ELECTROMAGNETIC RADIATION
GEOMETRY
IMAGE PROCESSING
IMAGE SCANNERS
IONIZING RADIATIONS
MATHEMATICS
MEDICINE
NUCLEAR MEDICINE
PROCESSING
RADIATIONS
RADIOLOGY
SCATTERING
X RADIATION