Table 1.

Demographic and protocol information.

Group	Sample	Age range (Years)	Mean age ± St.dev. (Years)	Male/Female	Protocols (Manufacturer, Field Strength (T), Voxel Size (mm), Sample)
Controls	208	20–95	57.9 ± 18.8	98/110	Phillips, 1.5, 1 × 0.875 × 0.875, 28
					Phillips, 1.5, 1.2 × 0.94 × 0.94, 9
					Phillips, 3, 1 × 1 × 1, 7
					Phillips, 3, 1.2 × 1 × 1, 26
					Phillips, 3, 0.9 × 0.9 × 0.9, 52
					Phillips, 3, 1.1 × 0.83 × 0.83, 16
					GE, 1.5, 1.2 × 0.94 × 0.94, 6
					GE, 3, 1.2 × 1.02 × 1.02, 6
					Siemens, 1.5, 1.2 × 1.25 × 1.25, 7
					Siemens, 3, 1 × 1 × 1, 28
					Siemens, 3, 1.2 × 1 × 1, 23
Ataxia	16	48–73	60.8 ± 6.8	13/3	Phillips, 3, 1.1 × 0.83 × 0.83, 16
HD
Far from onset	23	21–51	36.8 ± 9.7	10/13
Near to onset	16	20–55	45.1 ± 8.6	13/3	Phillips, 3, 0.9 × 0.9 × 0.9, 52
Early symptoms	13	30–59	50.8 ± 7.9	7/6
AD	66	55–93	74 ± 10.5	40/26	Siemens, 3, 1.2 × 1 × 1, 27
					Siemens, 1.5, 1.2 × 1.25 × 1.25, 7
					Phillips, 1.5, 1.2 × 0.94 × 0.94, 7
					Phillips, 3, 1.2 × 1 × 1, 8
					GE, 1.5, 1.2 × 0.94 × 0.94, 9
					GE, 3, 1.2 × 1.02 × 1.02, 8
PPA
Lv	18	51–79	68.3 ± 5.4	10/8	Siemens, 3, 1 × 1 × 1, 21
Sv	16	57–77	65.5 ± 6.5	11/5	Phillips, 3, 1.2 × 1 × 1, 29
Av	16	48–84	68.2 ± 10.7	9/7