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Fig. 1 | EJNMMI Physics

Fig. 1

From: HYPR4D kernel method on TOF PET data with validations including image-derived input function

Fig. 1

Illustration of Gibb’s artifact. a The transaxial view of a contrast phantom (consisting of two spheres with 17 mm and 10 mm in diameter and a 4:1 hot-to-background contrast ratio) reconstructed with PSF resolution modeling; Gibb’s artifact appears as a ‘ring’ in relatively big structures (e.g. 17 mm sphere) while the ring gets pushed toward the center of the structure and forms the overshoot when the structure is small enough (e.g. 10 mm or smaller) and b the corresponding line profile as shown in (a) with black arrows pointing at the locations with the correct activity concentration and red arrows pointing at the locations of underestimated voxels near the edge of the structure. Note that when using a volume-of-interest (VOI) with the physical dimension of the 10 mm sphere, a ~ 60% contrast recovery coefficient is obtained as shown in Fig. 2 since the underestimation near the edge of the structure outweighs the overestimation near the center of the structure

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