Attenuation Correction for Small Animal PET Images: A Comparison of Two Methods

Table 2

Average number of counts and recovery value measured on uniformly filled mouse and rat phantom images and in the hot sphere of a rat-sized phantom. For the uniformly filled phantoms, also the flatness is showed.

	Roi counts (cps)	RV (%)	Flatness
Mouse phantom
Original PET image	429.68	—	3.1%
CT-AC image	623.02	31.0%	1.1%
SE-AC image	613.89	29.6%	1.2%
Rat phantom
Original PET image	210.34	—	22.0%
CT-AC image	405.32	48.1%	1.2%
SE-AC image	396.17	45.8%	2.7%
Rat phantom with hot sphere
Original PET image	452.79	—	—
CT-AC image	760.83	40.5%	—
SE-AC image	708.37	33.6%	—