Abstract
12) is devel‑ oping with advancement of SPECT devices and improve‑ ment of computer performance. Various advantages of the OSEM method that have been reported include the followings: The signal‑to‑noise ratio (S/N) in low count regions is improved no negative value is present in re‑ constructed values streak artifacts are reduced and scatter attenuation and resolution correction can be performed by implementing physical phenomena in prob‑ ability calculations in advance. 3‑7) These days clinical cases applying the characteristics such us reduced streak artifacts or improved S/N in low count regions have been reported in myocardial SPECT and tumor SPECT. 8‑10)
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