H Mraity
Development and validation of a visual grading scale for assessing image quality of AP pelvis radiographic images
Mraity, H; England, A; Cassidy, SF; Eachus, P; Hogg, P
Authors
A England
Dr Simon Cassidy S.Cassidy@salford.ac.uk
Associate Professor/Reader
Dr Peter Eachus P.Eachus@salford.ac.uk
Senior Lecturer
Prof Peter Hogg P.Hogg@salford.ac.uk
Abstract
OBJECTIVE: Apply psychometric theory to develop and validate a visual grading scale for assessing visual perception of AP pelvis digital image quality.
METHODS: Psychometric theory was used to guide scale development. Seven phantom and 7 cadaver images of visually and objectively predetermined quality were used to help assess scale reliability and validity. 151 volunteers scored phantom images; 184 volunteers scored cadaver images. Factor analysis and Cronbach’s alpha were used to assess scale validity and reliability.
RESULTS: A 24 item scale was produced. Aggregated mean volunteer scores for each image correlated with the rank order of the visually and objectively predetermined image qualities. Scale items had good inter-item correlation (≥0.2) and high factor loadings (≥0.3). Cronbach's alpha (reliability) revealed that the scale has acceptable levels of internal reliability for both phantom and cadaver images (α= 0.8 and 0.9, respectively). Factor analysis suggested the scale is multidimensional (assessing multiple quality themes).
CONCLUSION: This study represents the first full development and validation of a visual image quality scale using psychometric theory. It is likely that this scale will have clinical, training and research applications.
ADVANCES IN KNOWLEDGE: This article presents data to create and validate visual grading scales for radiographic examinations. The visual grading scale, for AP pelvis examinations, can act as a validated tool for future research, teaching and clinical evaluations of image quality.
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 2, 2016 |
Online Publication Date | Mar 31, 2016 |
Publication Date | Mar 31, 2016 |
Deposit Date | Mar 22, 2016 |
Publicly Available Date | Oct 25, 2018 |
Journal | British Journal of Radiology |
Print ISSN | 0007-1285 |
Electronic ISSN | 1748-880X |
Publisher | British Institute of Radiology |
Volume | 89 |
Issue | 1061 |
Pages | 20150430 |
DOI | https://doi.org/10.1259/bjr.20150430 |
Publisher URL | http://dx.doi.org/10.1259/bjr.20150430 |
Related Public URLs | http://www.bir.org.uk/publications/journals/ |
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