title: Radiological laser film scanner sampling artifact.
abstract: 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.
authors.affiliation: R & D Center, Konica Corporation, Tokyo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Ishimitsu
authors.forename: K
authors.initials: K
authors.lastname: Arai
authors.forename: R K
authors.initials: RK
authors.lastname: Taira
authors.forename: H K
authors.initials: HK
authors.lastname: Huang
mesh_terms: D000703:Analog-Digital Conversion; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007834:Lasers; D015903:Moire Topography; D011859:Radiography / Q000379:methods*