(a) The and (b) R rates as a function of for the IEC and modified IEC plus scatter phantoms. Superimposed is a scatterplot reporting the and R rates in and in patients. NECR curve (c) for the IEC and modified IEC plus scatter phantoms.
Reconstructed images from acquisitions with , background concentration of and ESD of (a) , (b) , (c) and (d) . Top panel contains hot lesions of 22, 17, 13, and (clockwise from bottom left). Bottom panel contains hot lesions of 8.1, 6.5, 4.7, and (clockwise from middle right).
3D scatterplot of observed plotted against sphere IDs and T/B ratios.
Box-plots for BV, with respect to (a) sphere ID, (b) ESD, and (c) .
Box-plots for CNR, with respect to (a) ESD, (b) T/B ratio, (c) sphere ID, and (d) . The analysis of residual for , BV and CNR did not show any significant departure from normality assumptions (p=0.20, 0.06, and 0.15, respectively). Some of the more useful graphs for checking assumptions of linearity in multiple regressions will involve plotting residuals versus predictor values. A horizontal band of points should be obtained with no hint of systematic trends, and this is indeed our case (not shown).
Results of visual detection of hot spheres for different T/B ratios, activity concentrations, and ESD for different sphere ID: Gray/white boxes indicate a detectable/undetectable sphere.
values [mean standard deviation (number of cases)] for different sphere IDs and T/B ratios.
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