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Measured error of the Virtual Grid electrodes as compared with the actual electrode position at the time of surgery determined by a handheld infrared stereotactic probe
Case Base Virtual to Actual Electrode Displacement (mm) Mean Min Max
1 CT 3.8 3.5 4.3 3.9 3.4 3.7 3.5 3.7 5.4 3.7 3.89 3.4 5.4
3 CT 0.5 3.6 4.3 3.1 2.3 4.1 3 2.4 4.9 4.2 3.24 0.5 4.9
4 CT 4.3 3.3 3 3.2 4 3.9 4.4 4.2 2.7 2.8 3.58 2.7 4.4
5 CT 2.6 3.8 2.1 2.4 2.7 2.4 2.1 3.3 4.5 2.1 2.8 2.1 4.5
All CT 3.4 0.5 5.4
2 MRI 3 4.1 3.5 2.6 2 1.9 2.7 2.3 1 0.8 2.39 0.8 4.1
3 MRI 0.8 0.5 0.8 1.6 1.3 3 3.2 4.7 4.3 4 2.42 0.5 4.7
4 MRI 1.4 1.4 2.5 2.3 3.5 2.8 5.2 2.6 4.7 3.7 3.01 1.4 5.2
5 MRI 2.9 1.5 1.7 3.3 2.2 1.6 2 1.5 1.8 4.2 2.27 1.5 4.2
All MRI 2.5 0.5 5.2

Case	Base	Virtual to Actual Electrode Displacement (mm)										Mean	Min	Max
1	CT	3.8	3.5	4.3	3.9	3.4	3.7	3.5	3.7	5.4	3.7	3.89	3.4	5.4
3	CT	0.5	3.6	4.3	3.1	2.3	4.1	3	2.4	4.9	4.2	3.24	0.5	4.9
4	CT	4.3	3.3	3	3.2	4	3.9	4.4	4.2	2.7	2.8	3.58	2.7	4.4
5	CT	2.6	3.8	2.1	2.4	2.7	2.4	2.1	3.3	4.5	2.1	2.8	2.1	4.5
All CT											3.4	0.5	5.4
2	MRI	3	4.1	3.5	2.6	2	1.9	2.7	2.3	1	0.8	2.39	0.8	4.1
3	MRI	0.8	0.5	0.8	1.6	1.3	3	3.2	4.7	4.3	4	2.42	0.5	4.7
4	MRI	1.4	1.4	2.5	2.3	3.5	2.8	5.2	2.6	4.7	3.7	3.01	1.4	5.2
5	MRI	2.9	1.5	1.7	3.3	2.2	1.6	2	1.5	1.8	4.2	2.27	1.5	4.2
All MRI											2.5	0.5	5.2