Fig. 2

Total-body ¹⁸F-FDG PET MIP images of different scan times reconstructed by OSEM and HYPER Iterative in a patient with lung cancer injected with full dose ¹⁸F-FDG. a ¹⁸F-FDG PET MIP images of 10 s, 30 s, 1 min, 2 min, 3 min, 4 min and 5 min, respectively, reconstructed by OSEM. The quality of OSEM-10 s, OSEM-30 s and OSEM-1 min images was low due to low counting rate and large signal noise, especially the OSEM-10 s and OSEM-30 s. The OSEM-2 min image reached the high quality, either that of OSEM-3 min to OSEM-5 min. b ¹⁸F-FDG PET MIP images of 10 s, 30 s, 1 min, 2 min, 3 min, 4 min and 5 min, respectively, reconstructed by HYPER Iterative. The quality of HYPER Iterative-10 s and HYPER Iterative-30 s had lower signal noise and higher quality than the counterparts by OSEM although they were still not excellent. The HYPER Iterative-1 min image reached the high quality, either that of HYPER Iterative-2 min to HYPER Iterative-5 min