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Demonstration of correlations between clinical and physical image quality measures in chest and lumbar spine screen–film radiography

M Sandborg, PhD1,, A Tingberg, PhD2, D R Dance, PhD3, B Lanhede, MSc4, A Almén, PhD2, G McVey, BSc, MSc3, P Sund, MSc4, S Kheddache, PhD, MD5, J Besjakov, MD, PhD6, S Mattsson, PhD2, L G Månsson, PhD4 and G Alm Carlsson, PhD1

1Department of Radiation Physics, Faculty of Health Sciences, Linköping University, SE 581 85 Linköping, Sweden, Departments of 2Radiation Physics and 6Diagnostic Radiology at Malmö, Lund University, Malmö University Hospital, SE 205 02 Malmö, Sweden, 3Joint Department of Physics, The Royal Marsden NHS Trust, Fulham Road, London SW3 6JJ, UK, and Departments of 4Radiation Physics and 5Radiology, Göteborg University, Sahlgrenska University Hospital, SE 413 45 Göteborg, Sweden



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  		Figure 1. Correlation between clinical and physical measures of image quality in the chest examination at three levels of significance. Correlations between (a) visual grading analysis score (VGAS) for criteria C5CH–C7CH and difference in optical density ({Delta}OD) for retrocardiac area (RCA) (r=0.95, p=0.00000001), (b) image criteria score (ICS) for criterion C3CH and {Delta}OD for costophrenic angle area (CPA) (r=0.60, p=0.013) and (c) ICS for criterion C5aCH and {Delta}OD central right lung (CRL) (r=0.48, p=0.060) are shown. The solid line is the linear regression line.

 


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  		Figure 2. The correlation between clinical and physical measures of image quality in the lumbar spine examination at three levels of significance. Correlations between (a) image criteria score (ICS) for criteria C1LS–C7LS and signal-to-noise ratio (SNR) L1D (r=1.00, p=0.0016), (b) visual grading analysis score (VGAS) for criterion C5LS and SNR L5D (r=0.98, p=0.022) and (c) VGAS for criteria C4LS–C5LS and properly exposed fraction (PEF, {gamma}>2.25) (r=0.90, p=0.099) are shown. The solid line is the linear regression line.

 




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