Table 1.
Visual Grading Analysis Scores for Anteroposterior Lumbar Spine Images Compared to a Reference Image Displayed on a 2-MP Monochrome Display; Four Observers and 30 Images for Each Criterion
| Criterion (according to [4]) | Visual Grading Analysis Score (VGAS) | p value | ||
|---|---|---|---|---|
| 2-MP Color | 2-MP Monochrome | Difference | ||
| Visually sharp reproduction, as a single line, of the upper- and lower-plate surfaces in the centered beam area | −0.13 | −0.23 | 0.09 | 0.13 |
| Visually sharp reproduction of the pedicles | −0.32 | −0.19 | −0.13 | 0.03* |
| Reproduction of the intervertebral joints | −0.58 | −0.45 | −0.13 | 0.01* |
| Reproduction of the spinous and transverse processes | −0.15 | −0.28 | 0.13 | 0.03* |
| Visually sharp reproduction of the cortex and trabecular structures | −0.17 | −0.09 | −0.08 | 0.15 |
| Reproduction of the adjacent soft tissues, particularly the psoas shadows | −0.41 | −0.42 | 0.01 | 0.89 |
| Reproduction of the sacro-iliac joints | −0.18 | −0.07 | −0.11 | 0.07 |
| Overall score | −0.28 | −0.25 | −0.03 | 0.24 |
Positive scores mean higher image quality than the reference image, negative scores lower.
* = Significant at the 0.05 level.