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CT data can be used for both anatomical image and attenuation correction (CTAC) of PET data in PET-CT scanners. The CTAC method is useful for attenuation correction, because the CT scan time is much shorter than the external radionuclide (e.g., (68)Ge) transmission scan time. However, the energy of the X-rays from CT is not monoenergetic and is much lower than that of the external radionuclide source. In this study, we evaluated the differences between emission PET images reconstructed with CT-based and (68)Ge-based attenuation correction.

nippon hoshasen gijutsu gakkai zasshi/nihon houshasen gijutsu gakkai zasshi

Comparison of Activity Expression between PET Using 68Ge-68Ga Line Source Attenuation Correction and PET-CT Using CT Attenuation Correction: Impact on Emission Images