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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, S, Eachus, P and Hogg, P 2016, 'Development and validation of a visual grading scale for assessing image quality of AP pelvis radiographic images' , British Journal of Radiology .

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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.

Item Type: Article
Schools: Schools > School of Health Sciences > Centre for Health Sciences Research
Journal or Publication Title: British Journal of Radiology
Publisher: British Institute of Radiology
ISSN: 0007-1285
Related URLs:
Funders: Non funded research
Depositing User: P Hogg
Date Deposited: 22 Mar 2016 14:31
Last Modified: 12 Jul 2016 10:34
URI: http://usir.salford.ac.uk/id/eprint/38215

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