TABLE 1

Statistical Comparison of 2- and 4-Parameter Arterial-Input Models in Midbrain

Subject	No. of parameters in model	K₁	k₂	k₃	k₄	V_T	RSS	AIC	SC
1	2	0.72	0.02			33.0	4.18	3	9
	4	0.66	0.22	1.26	0.12	33.0	4.20	7	15
2	2	0.81	0.02			44.3	0.87	4	12
	4	0.70	0.03	0.08	0.03	90.3	0.82	8	19
3	2	0.48	0.02			25.6	0.68	4	13
	4	0.39	0.02	0.03	0.15	25.6	0.69	8	19
4	2	0.68	0.03			26.3	3.94	3	9
	4	0.59	0.04	0.26	0.50	24.9	3.94	7	16
5	2	0.39	0.02			17.8	1.55	4	11
	4	0.32	0.03	0.26	0.29	17.8	1.54	8	17