TABLE 2

Summary of PET Parameters

Parameter	Mean ± SD for:											Difference (P) for remote vs. normal
		ROIs in patients with TBI									Healthy volunteers (normal cortex)
		Contusion	PC_4.5	PC_13.5	PC_22.5	Remote					Healthy volunteers (normal cortex)
K₁ (mL/min)	0.027 ± 0.021	0.064 ± 0.025	0.073 ± 0.025	0.078 ± 0.027	0.095 ± 0.031	0.103 ± 0.014	NS
k₂ (/min)	0.113 ± 0.075	0.192 ± 0.109	0.182 ± 0.063	0.183 ± 0.089	0.198 ± 0.059	0.227 ± 0.075	NS
k₃ (/min)	0.039 ± 0.018	0.069 ± 0.05	0.065 ± 0.034	0.060 ± 0.035	0.061 ± 0.018	0.175 ± 0.041	<0.0001
k₄ (/min)	0.015 ± 0.022	0.008 ± 0.008	0.009 ± 0.008	0.009 ± 0.009	0.012 ± 0.004	0.008 ± 0.004	<0.01
Blood volume (mL/g)	0.024 ± 0.016	0.030 ± 0.043	0.035 ± 0.034	0.044 ± 0.054	0.042 ± 0.032	0.041 ± 0.017	NS
K_i (mL/min)	0.006 ± 0.004	0.017 ± 0.008	0.019 ± 0.009	0.019 ± 0.009	0.023 ± 0.009	0.045 ± 0.007	<0.0001
CBF (mL/g/min)	0.11 ± 0.08	0.31 ± 0.12	0.35 ± 0.11	0.38 ± 0.12	0.46 ± 0.13	0.49 ± 0.08	NS

NS = not significant.