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EFFECTS OF A DIGITAL FILTER ON DETECTABILITY OF A PHANTOM LESION IN A SCINTIGRAM OF THE EQUINE TARSUS
Author(s) -
Eksell Per,
Carlsson Sten,
Lord Peter,
Carlsten Johan
Publication year - 2000
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.1740-8261.2000.tb02089.x
Subject(s) - tarsus (eyelids) , imaging phantom , medicine , filter (signal processing) , lesion , nuclear medicine , image quality , artificial intelligence , computer vision , radiology , image (mathematics) , surgery , computer science , eyelid
The aim of this study was to examine the effects of a digital filter on the detectability of a phantom lesion in a scintigram of the equine tarsus. Lateral images containing 50,100,150, 500, or 1000 kcounts were acquired. A created phantom lesion of 0 (normal), 10,15,20, or 30% increased intensity relative to local background was placed in the centrodistal tarsal joint area in the images of different count levels. Duplicate images were filtered with a Metz filter. The complete set of filtered and unfiltered images totaling 180 images was projected as slides to a group of 9 observers. The sensitivity in 50 and 100 kcount images was improved by applying the filter. Digital filtering increased the false positive fraction at all count levels but this effect was most pronounced in 500 and 1000 kcount images. Based on receiver operating characteristic analysis, filtering of a 50 kcount image improved image quality to that of a 150 kcount image.