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EJNMMI Physics
Fig. 8 | EJNMMI Physics

Fig. 8

From: Impacts of acquisition and reconstruction parameters on the absolute technetium quantification of the cadmium–zinc–telluride-based SPECT/CT system: a phantom study

Fig. 8

Fitted 3D-scatter plot of standard deviations (SDs) of RCs. a 32:1 T/B ratio; b 16:1 T/B ratio; c 8:1 T/B ratio; d 4:1 T/B ratio; X-axis indicates 6 spheres (37 mm, 28 mm, 22 mm, 17 mm, 13 mm, and 10 mm); Y-axis indicates SD of RCs; Z-axis indicates different acquisition time/frame (1–120 s/frame); White dashed line is the proposed cut-off value for acquisition time (40 s/frame). Fixed reconstruction parameters: 35 iterations, 20 subsets, no filter, AC + SC + RR combination; Fixed acquisition parameters: 15% energy window

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