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Figure 8. The correlation between clinical and physical measures of image quality in the (a) lumbar spine and (b) chest examination. Correlation for lumbar spine between visual grading analysis score (VGAS) for structure 5 and change in optical density (
OD) L3T (r=0.95, p=0.050) and for chest for structure 6 and OD RCA (r=0.98, p=0.005) are shown. The solid curves in (a) and (b) are the linear regression lines. OD L3T denotes the optical density difference of a transverse process in the L3 vertebrae and OD RCA denotes the optical density difference of a blood vessel in the retrocardiac area (RCA).
