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IMAGE MAGNIFICATION IN DIGITAL FLUOROSCOPY
Author(s) -
Rosenstein Diana S.
Publication year - 1998
Publication title -
veterinary radiology and ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.541
H-Index - 60
eISSN - 1740-8261
pISSN - 1058-8183
DOI - 10.1111/j.1740-8261.1998.tb01610.x
Subject(s) - magnification , fluoroscopy , image intensifier , image quality , radiography , digital image , computer vision , optics , digital imaging , digital radiography , artificial intelligence , medicine , computer science , image processing , image (mathematics) , radiology , physics
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.