Image magnification in digital fluoroscopy

Image magnification is inherent in radiography. In digital fluoroscopy, the three components of magnification are geometric, electronic and photographic. In this study, the total magnification factor of a digital imaging system was determined by two methods, 1) comparison of measurements of a known...

Full description

Saved in:
Bibliographic Details
Published in:Veterinary radiology & ultrasound 1998-07, Vol.39 (4), p.304-308
Main Author: Rosenstein, D.S. (Michigan State University, East Lansing, MI.)
Format: Article
Language:English
Subjects:
Animals
AUDIOVISUAL AIDS
digital imaging
Electronics
EQUATIONS
fluoroscopy
Fluoroscopy - veterinary
FOCUS LENGTH
IMAGE PROCESSING
IMAGERY
Lasers
Linear Models
magnification
MATHEMATICS
PENUMBRA
Photography - veterinary
Printing
Radiographic Image Enhancement
Radiographic Magnification - veterinary
RADIOGRAPHY
VIDEO CAMERAS
X-Ray Film - veterinary
X-Ray Intensifying Screens - veterinary
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Image magnification is inherent in radiography. In digital fluoroscopy, the three components of magnification are geometric, electronic and photographic. In this study, the total magnification factor of a digital imaging system was determined by two methods, 1) comparison of measurements of a known object to its image and 2) calculation of geometric, electronic and photographic magnification from the imaging system specifications. Both methods were employed for various focal‐film distances, image intensifier tube modes and laser printer formats. Results of these two methods were different due to the detrimental effect of penumbra on image quality with increasing magnification. If a radiographic image is to be used to approximate object size, then a technique should be used that will minimize magnification. In digital fluoroscopy this is achieved with the shortest object‐film distance (assuming a fixed focal‐object distance), largest image intensifler mode and greatest number of images per sheet of film.
ISSN:1058-8183
1740-8261
DOI:10.1111/j.1740-8261.1998.tb01610.x