At the end of the case, merging the ct scan and the mri and comparing the electrodes to the plan, it was found that the entry points of the electrodes were all slightly deviated from the plan.
The surgeon inferred that there most likely was a merge issue, due to the fact the post-op ct did not include the entire top of the head.
The surgeon was fine with placement of electrodes and the case concluded successfully, however even after the case when the company representative tried to adjust the merge, the ct and mri still could not be adjusted and entry points of the electrodes remained off by the same amount in the same direction.
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