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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.