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Comparison of two commercial whole body PET systems based on LSO and BGO crystals respectively for brain imaging
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Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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 .

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

Contrast recovery for each sphere and each acquisition time.

Image of FIG. 6.
FIG. 6.

Contrast-to-noise ratio (CNR) for 3-(a), 6-(b), and (c) acquisition times for small spheres.

Image of FIG. 7.
FIG. 7.

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).


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Characteristics of the and the Biograph.

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Main performances of and Biograph cameras.

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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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Comparison of two commercial whole body PET systems based on LSO and BGO crystals respectively for brain imaging