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• W2552164818 abstract "Tissue photon attenuation is one of the essential artifacts requiring correction in clinical cardiac positron emission tomography (PET) imaging. However, due to small body size its impact on diagnostic accuracy in small rodents is considered to be limited or even ignorable. The present cardiac PET study compares lean and obese rats to determine the influence of tissue attenuation on quantitative assessment as well as regional tracer distribution.A dedicated small animal PET system equipped with a 57Co rotating source for transmission was used. To assess the impact of tissue attenuation in rats with different body sizes, cardiac 18F-FDG -PET studies for Zucker diabetic fatty rats (obese rats) and Zucker lean rats (lean rats) were performed. The radiotracer activity reduction by attenuation was compared between the two groups. Regional tracer distribution calculated with and without attenuation correction was also assessed.The chest diameter was significantly longer in obese than in lean rats (5.6±0.3cm in obese and 4.5±0.2cm in lean rats, p<0.0001). Whereas the activity reduction by attenuation was significantly greater in obese than in lean rats (44.1±2.5% and 5.1±3.1%, p<0.0001), the regional variation of tissue attenuation among the ventricular walls was minimal in both lean (p=0.73) and obese rats (p=0.65).Attenuation correction is indispensable for accurate comparison of cardiac tracer activity between animals with different body size, whereas it can be omitted for evaluation of regional tracer distribution." @default.
• W2552164818 created "2016-11-30" @default.
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• W2552164818 date "2017-01-01" @default.
• W2552164818 modified "2023-09-24" @default.
• W2552164818 title "Impact of tissue photon attenuation in small animal cardiac PET imaging" @default.
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• W2552164818 doi "https://doi.org/10.1016/j.ijcard.2016.11.119" @default.
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