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EJNMMI Physics
Fig. 1 | EJNMMI Physics

Fig. 1

From: Head-to-head comparison between digital and analog PET of human and phantom images when optimized for maximizing the signal-to-noise ratio from small lesions

Fig. 1

Results from the IEC phantom with the comparisons between digital PET (blue lines) and analog PET (red lines) and for images reconstructed with the TOF information (TOF, solid lines) and without the latter (noTOF, dashed lines) of (1) the relationships between signal-to-noise-ratio (SNR) and contrast recovery coefficients (CRC), according to the number of OSEM iterations involved in the image reconstruction process and for the hot spheres of 10 mm (a), 22 mm (b), and 37 mm (c) diameters and (2) the relative noise as a function of the number of OSEM iterations (d). Points corresponding to the optimal number of iterations (i.e., those maximizing SNR of the 10-mm diameter sphere) are depicted by crosses (4 iterations (it) for the noTOF images from both cameras, and 1 and 2 iterations for the TOF images from Vereos and Ingenuity, respectively), and results from NEMA-based reconstruction are represented with blue triangles for the Vereos and red triangles for the Ingenuity images

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