Radiological laser film scanner sampling artifact.
Artifacts seen on laser digitized radiographs are analyzed and mathematically explained based on the concept of image contrast. Our investigation considered the following determinants: (a) laser spot size, (b) signal processing components, (c) image characteristics, and (d) observer performance. A functional relationship between the sampling interval, laser spot size, and the contrast of the artifact seen on the digitized image is derived. This relationship is verified experimentally using a variable spot size laser source and sampling at interval of 175.0 microns. The problem of digitizing artifact seen on film images obtained with anti-scatter grids is discussed.
Ishimitsu
Y
Y
R & D Center, Konica Corporation, Tokyo, Japan.
Arai
K
K
Taira
R K
RK
Huang
H K
HK
D000703:Analog-Digital Conversion; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007834:Lasers; D015903:Moire Topography; D011859:Radiography / Q000379:methods*