Table 4. Evaluation of a planned target coordinate versus a current target coordinate. Using the information, one can evaluate the data in MidACPC space and also compute the added movement required on head-stage if a readjustment to target is desired. To go from the current position to the planned target, a movement 0.52 mm AP, LAT to left 0.71 mm, and VERT upwards 2.02 mm needs to be performed. Notably, the radial error is 0.89 mm, and the Euclidean error is 2.2 mm, which leads to the conclusion that the largest error is in the VERT dimension, but the current position is along the planned trajectory.

AP = Antero-Posterior; LAT = Lateral; VERT = Vertical; MidACPC = Middle of anterior commissure and posterior commissure; CRW = Cosman-Roberts-Wells Stereotactic Frame.

	AP	LAT	VERT
CRW Planned Position	-0.8	-9.3	1.7
MidACPC Planned Position	-3	-11.5	-3
CRW Current Position	-2.36385	-8.20936	0.615163
MidACPC Current Position	-4.40882	-10.3171	-4.21997
To Get From Current to Planned Target	0.529056	-0.71043	2.021812
Radial Error from Current to Planned Target	0.88578
Euclidean Error from Current to Planned Target	2.207336