Cone Beam Micro-CT System for Small Animal Imaging and Performance Evaluation

Table 2

Mean value and standard deviation (SD) in different five ROIs with different exposure intensities (in HU).

	50 kVp, 0.4 mA		50 kVp, 0.6 mA		50 kVp, 0.8 mA		50 kVp, 1.0 mA		50 kVp, 1.2 mA
	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Center	−18.9	66.1	−18.0	53.9	−18.7	46.7	−18.4	42.2	−16.1	38.0
Top	4.0	59.3	6.1	47.9	5.3	41.4	4.7	37.6	5.0	33.7
Bottom	−0.2	59.9	−0.4	48.3	0.5	42.2	1.0	37.3	1.9	34.7
Left	−0.6	59.6	−0.4	48.5	0.5	42.6	1.2	37.8	1.3	34.1
Right	5.5	59.3	6.6	47.6	4.9	41.2	4.7	36.9	4.8	33.6
Average difference between center and periphery	16.9±9.8		16.8±10.0		17.3±9.9		17.0±9.7		15.5±8.8
Average SD	60.8±3.0		49.3±2.6		42.9±2.2		38.4±2.2		34.8±1.8