Biomedical Engineering Reference
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the maximum distance between coil and head. Note that robot-tracking calibration,
coil and head registration, and the hair of the subject influence the accuracy beside
the laser scan.
8.5 Capability of Direct Tracking for Robotized TMS
Direct head tracking, in contrast to indirect head tracking, does not need an
additional marker for tracking and is therefore theoretically more robust and
increases the comfort for patient and user. However, our practical evaluation in the
context of medical head tracking has shown that the current methods for direct
tracking cannot be used for accurate head tracking. The FaceApi in its current state
is far off from being an accurate tracking method. However, the general principle is
still promising. 3D Laser scanning systems can provide accurate tracking that
might be suitable for robotized TMS, nevertheless, the scanning and computation
time are the limiting factors so far. With further developments the scanning time
will decrease and with faster processors and smarter implementations the com-
putation will speed up. Thus, direct head tracking with 3D laser scans is a
promising method for the near future. Furthermore, we have shown that a 3D head
contour can accurately be generated with 3D laser scans that can then be used as a
navigation source.
References
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