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	−0.12590
SC only	3.67710	0.00784	2.05510	0.35852	−0.35850
Chang + SC	5.49350	0.00370	0.23920	0.04173	−0.04160
CTAC + SC	5.48270	0.00308	0.24972	0.04357	−0.04350
CTIACR + SC	5.66160	0.01463	0.10222	0.01783	−0.01230
CTMAC + SC	5.66780	0.00352	0.06666	0.01163	−0.01120
The part of lower activity concentration in four-quarter phantom
Original	2.25120	0.01806	0.17031	0.07047	−0.06860
SC only	1.66000	0.02205	0.75784	0.31355	−0.31320
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

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.