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. 2023 Oct 31;9(1):33–39. doi: 10.17996/anc.23-00178

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© The Japanese Society of Nuclear Cardiology 2023

This article is licensed under a Creative Commons [Attribution-NonCommercial-NoDerivatives 4.0 International] license. https://creativecommons.org/licenses/by-nc-nd/4.0/

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graphic file with name anc-9-33-g004.jpg — Figure 4 Count rate measurement of ¹³N.

The relation of measured radioactivity and count rate from PET acquisition was shown. The graph for random coincidence counts rate (circle) and net true count rate (square). X-axis indicated the theoretical radioactive concentration (MBq/mL) estimated by the radioactive decay from the measured activity in the vial obtained by curie meter prior to PET scan. Y-axis indicated the count rate (counts/sec) of the vial from the PET acquisitions. The inclination of the graph for random coincidence counts rate started to decrease at the plot of approximately 3Mcps (approximately 36.3MBq/mL for estimated radioactive concentration). Net true counts rate demonstrated its peak for below 4.8 Mcps (approximately 36 MBq for estimated radioactive concentration). The plots for NECR. The definition of X and Y-axis was similar to graph A. NECR analysis showed the peak for approximately 3.0 Mcps (36.3 MBq/mL for estimated radioactive concentration).