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Table 2 CRC of the hot and cold sphere phantoms

From: Yttrium-90-labeled microsphere tracking during liver selective internal radiotherapy by bremsstrahlung pinhole SPECT: feasibility study and evaluation in an abdominal phantom

Diameter (mm) (act sph/bg) 30 (0) 19 (3.5) 24 (3.5) 28 (3.5) 36 (3.5) 36 (7)
TOF-PETa 0.56 0.01 0.63 0.84 1.10 1.07
MEPH-SCAT SPECTa 0.59 0.56 0.69 0.91 1.03 1.09
MEPH-SPECTa 0.32 0.33 0.39 0.52 0.60 0.60
HEGP-SPECTa 0.01 0.13 0.06 0.23 0.38 0.39
MEGP-SPECTa 0.01 0.12 0.06 0.22 0.36 0.37
  1. aCRC of the different spheres obtained for reconstructions with 20 iterations × 8 subsets, except for the MEPH-SCAT shown for reconstructions with 70 iterations × 8 subsets. The iteration numbers are optimal for the hot spheres, but not for the cold ones, the CRC of which continues to slowly improve with the iteration number (see Appendix 2 for the convergence rate). According to Equation 2, an ideal reconstruction gives a CRC equal to 1 for both cold and hot spheres. TOF-PET, time-of-flight positron-emission tomography; MEPH-SCAT SPECT, medium-energy pinhole with scatter correction single photon emission computed tomography; MEPH-SPECT, medium-energy pinhole single photon emission computed tomography; HEGP-SPECT, high-energy general-purpose single photon emission computed tomography; MEGP-SPECT, medium-energy general-purpose single photon emission computed tomography; act sph/bg, ratio between the specific activity of the sphere and of the background.