Schematic of the phantom; spheres MC1 and LC1 are filled with water; SH1, SH2, SH3, MH1, LH1 are filled with different -FDG solution. All spheres are placed in cylindrical phantom also filled with warm background.
Plot (a) NECR plot of the and the Biograph tomographs as a function of the radioactivity concentration, according to NEMA-1994 recommendations. Plot (b) same curves for the activity range of .
Comparison of true and random event rates for [plot (a)] and Biograph [plot (b)], obtained for the three sets of experiments (3, 6, and ) and for five patients as a function of singles rate on the two cameras.
Comparison of the contrast recovery measured in images obtained on the and reconstructed with 3DRP (Hann filter, ) and AWOSEM (16 iterations, 8 subsets, FWHM Gaussian filter post-reconstruction). (a) scan, (b) scan, (c) scan.
Contrast recovery for each sphere and each acquisition time.
Contrast-to-noise ratio (CNR) for 3-(a), 6-(b), and (c) acquisition times for small spheres.
Slices of the phantom acquired on the Biograph (top left) on the CT (top right); superposition of the CT and the PET images (bottom left); sketch showing the spheres (bottom right).
Characteristics of the and the Biograph.
Main performances of and Biograph cameras.
Measured volumes of the spheres and corresponding activity concentration of spheres with respect to that of the warm background. Corresponding diameter of the spheres was calculated from the measured volume assuming perfect spherical objects. However, deviations from spherical objects were observed.
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