. Author manuscript; available in PMC: 2013 May 7.

Published in final edited form as: Phys Med Biol. 2012 Apr 5;57(9):2477–2490. doi: 10.1088/0031-9155/57/9/2477

Table 3.

Linear attenuation coefficients (LACs) measured from the bovine femur phantom from experiment 1. Errors from CT-based measures compared to the 511 keV PET transmission image are also given. The coefficient of variation of all LAC values ranged from 3% to under 1%.

Energy	511 keV	140 kVp		120 kVp		80 kVp

Material & region	LAC_TX (cm⁻¹)	LAC_CTAC (cm⁻¹)	Δ_LAC (%)	LAC_CTAC (cm⁻¹)	Δ_LAC (%)	LAC_CTAC (cm⁻¹)	Δ_LAC (%)
Compact bone 1^*	0.151	0.149	−1.3	0.141	−6.8	0.129	−14.1
Compact bone 2	0.150	0.148	−1.3	0.140	−6.6	0.129	−13.6
Cancellous bone 1	0.096	0.093	−3.1	0.093	−2.9	0.092	−3.4
Cancellous bone 2	0.096	0.094	−2.5	0.093	−2.6	0.093	−3.0
Contrast cylinder	0.097	0.124	27.3	0.123	26.7	0.124	27.5

Numbers correspond with regions indicated in Figures 2 and 4.