Table 2.

Accuracy and iterative number comparison among intensity ECC, gradient ECC, and ACMI.

Pair mode	Pairs	Accuracy (median/maximum mm)			Number of iterations (Mean ± SD)
		Intensity ECC	Gradient ECC	ACMI	Intensity ECC	Gradient ECC	ACMI
Original images
T1-PET	7	2.78/4.96	2.73/4.31	2.38/4.22	269.5 ± 84.8	111.3 ± 29.9	172.2 ± 44.0
T2-PET	7	1.91/6.37	1.52/5.84	1.39/5.51	288.0 ± 145.1	87.5 ± 45.8	161.7 ± 43.9
PD-PET	7	2.46/6.19	1.97/4.72	1.62/3.41	222.2 ± 108.7	93.2 ± 36.9	159.9 ± 58.6
T1 rec-PET	4	3.19/8.37	2.88/6.12	2.63/5.43	240.5 ± 92.2	102.4 ± 33.1	145.5 ± 49.7
T2 rec-PET	5	3.15/9.15	3.04/7.13	2.72/6.08	220.3 ± 97.8	93.6 ± 42.8	174.9 ± 37.3
PD rec-PET	5	3.07/8.13	2.65/7.41	2.37/6.74	224.7 ± 89.5	99.3 ± 41.9	183.1 ± 63.0
Subsampled version
T1-PET	7	4.13/8.25	3.70/7.37	3.40/7.48	169.0 ± 65.0	93.7 ± 31.4	127.5 ± 36.4
T2-PET	7	4.14/9.18	3.52/6.18	3.06/5.10	189.0 ± 63.4	79.1 ± 35.9	138.8 ± 40.6
PD-PET	7	3.07/12.94	2.74/7.06	2.59/5.36	151.5 ± 63.3	82.1 ± 39.0	135.7 ± 32.8
T1 rec-PET	4	4.62/10.37	3.95/9.22	3.51/8.83	150.2 ± 59.3	88.6 ± 28.9	118.5 ± 26.3
T2 rec-PET	5	5.25/16.15	4.92/10.88	4.83/7.07	176.5 ± 59.1	89.7 ± 34.2	136.7 ± 35.6
PD rec-PET	5	4.17/11.82	3.39/8.17	3.03/6.33	144.5 ± 52.2	90.7 ± 40.6	113.7 ± 29.4
Small-overlapped version
T1-PET	7	4.15/5.78	3.71/6.65	3.33/7.17	146.2 ± 93.2	94.9 ± 35.7	112.3 ± 29.9
T2-PET	7	3.34/8.37	2.44/6.07	2.20/4.94	207.5 ± 88.2	120.5 ± 61.3	153.0 ± 48.2
PD-PET	7	3.98/8.18	3.11/6.21	2.84/5.11	213.7 ± 83.1	106.8 ± 47.9	134.2 ± 51.4
T1 rec-PET	4	3.33/10.85	2.96/8.13	2.61/6.72	139.5 ± 64.1	68.6 ± 40.7	96.5 ± 43.6
T2 rec-PET	5	4.17/12.05	3.89/9.27	3.21/7.38	170.0 ± 79.3	63.9 ± 37.0	99.1 ± 46.5
PD rec-PET	5	3.39/9.10	3.30/7.58	3.16/6.91	193.0 ± 114.8	103.4 ± 58.0	133.1 ± 52.8