Fig. 2.

Optimization of PET parameters using ¹⁸F plant phantoms. a Effect of scatter on the accuracy of stem and root phantom radioactivity measurements. Bars show percent reduction in the error of phantom measurement after scatter correction under 3-D mode. b Effect of attenuation on the accuracy of stem and root phantom radioactivity measurements. Bars show percent reduction in the error of phantom measurement after attenuation correction under either 2-D (white) or 3-D (Grey) mode. c & d Error in the stem c and root d phantom radioactivity measurements based on the emission scans under 2-D and 3-D mode with different transmission scan times (10 s, 2 min, 4 min, and 20 min). For (C) and (D), bars show the average error of PET measurements of ¹⁸F phantom radioactivity, after attenuation correction and scatter correction, as a percent of the radioactivity of the phantoms measured using a calibrated scintillation counter. For all graphs error bars represent standard error