Automatically Solving Ambiguities - Brainlab EXACTRAC INFRARED MONITORING Clinical User Manual

9.2.3

Automatically Solving Ambiguities

General ExacTrac Infrared Monitoring compares all possible marker positions detected by the infrared
Information camera system, real marker positions, and possible positions due to ambiguities, with an internal
reference list in the program, the look-up table (LUT). The look-up table contains the real marker
positions generated in one of the following ways:
• Using the original 3D CT data.
• By saving an ambiguity-free marker pattern of the patient as detected by the camera system,
Elimination The automatic software routine dismisses all calculated marker positions that do not correspond to
Procedure the look-up table (see Figure 40). The majority of possible ambiguities are automatically resolved in
this way.
Clinical User Guide Rev. 1.1, ExacTrac Infrared Monitoring Ver. 1.0
e.g. during the initial patient setup on a simulator.
a
No. Description
a
Marker positions from CT or simulation
Actual markers (black) and other positions due to ambiguities (white) as calculated by
s
the infrared camera system
s
Figure 40
99