Research Article
Investigation of Attenuation Correction for Small-Animal Single Photon Emission Computed Tomography
Table 2
Assessing the results after corrections of four-quarter phantom with five different parameters.
| | Mean | CV | RMSE | NRMSE | MPE |
| The part of higher activity concentration in 4-quarter phantom |
| Original | 5.01020 | 0.00588 | 0.72227 | 0.12601 | | SC only | 3.67710 | 0.00784 | 2.05510 | 0.35852 | | Chang + SC | 5.49350 | 0.00370 | 0.23920 | 0.04173 | | CTAC + SC | 5.48270 | 0.00308 | 0.24972 | 0.04357 | | CTIACR + SC | 5.66160 | 0.01463 | 0.10222 | 0.01783 | | CTMAC + SC | 5.66780 | 0.00352 | 0.06666 | 0.01163 | |
| The part of lower activity concentration in four-quarter phantom |
| Original | 2.25120 | 0.01806 | 0.17031 | 0.07047 | | SC only | 1.66000 | 0.02205 | 0.75784 | 0.31355 | | Chang + SC | 2.48390 | 0.01487 | 0.07577 | 0.03135 | 0.02770 | CTAC + SC | 2.47640 | 0.01622 | 0.07086 | 0.02932 | 0.02459 | CTIACR + SC | 2.42750 | 0.02335 | 0.05547 | 0.02295 | 0.00436 | CTMAC + SC | 2.59160 | 0.01451 | 0.17826 | 0.07376 | 0.07223 |
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The true value of the higher activity concentration is 5.732 MBq/mL. The true value of the lower activity concentration is 2.417 MBq/mL.
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