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Comparison of ratios between measured and geometric sensitivities for different small-animal PET scanners. All sensitivities were obtained from the following published evaluations based on the NEMA standard with a lower energy threshold of 250 keV: Omidvari et al (2017), Stortz et al (2018), Ko et al (2015), Bergeron et al (2009), Wang et al (2006), Szanda et al (2011), Wong et al (2012), Bao et al (2009).
