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EJNMMI Physics
Fig. 1 | EJNMMI Physics

Fig. 1

From: Small lesion depiction and quantification accuracy of oncological 18F-FDG PET/CT with small voxel and Bayesian penalized likelihood reconstruction

Fig. 1

Recovery coefficients (RC) and the standard deviation (SD) of the CTN phantom. a The RCs were plotted against the diameter of the spheres. The trend lines were fitted with local polynomial regression model for each group. The hot spheres in the phantom background had higher RCs than those in the polystyrene-filled chambers with the same diameter. The difference of the RC is most obvious at the diameters of 10, 13, 17, and 22 mm. The trend lines pass through in the middle of the two data points of the RCs. b The mean of the SD was calculated by averaging the SDs from eight VOIs placed in the phantom background and plotted for each reconstruction group (red dot). The error bar showed the standard deviation of the SD that was also calculated from eight VOIs placed in the phantom background. A narrower error bar represents that the image noise was more homogeneous across different regions in the phantom background

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