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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

Development and validation of a visual grading scale for assessing image quality of AP pelvis radiographic images Thumbnail


Authors

H Mraity

A England



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.

Citation

Mraity, H., England, A., Cassidy, S., Eachus, P., & Hogg, P. (2016). Development and validation of a visual grading scale for assessing image quality of AP pelvis radiographic images. British Journal of Radiology, 89(1061), 20150430. https://doi.org/10.1259/bjr.20150430

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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