On (b)(6) 2020, the surgeon notified the field service engineer (fse) who assisted the surgery, that during the post op scan and merge there was deviation from the planned entry by ~5mm.
The surgeon said there was no impact to the patient, but the reading on the rns depth leads will be affected as they are not in the planned location.
The patient was registered using contactless registration.
The patient was wearing a face mask during the ct scan, so the metal bridge of the face mask as well as the elastic loops of the mask were prominent in the scan.
The verification process looked to be within acceptable range and no noticeable shifts in the head occurred to the fse¿s and surgeon¿s knowledge.
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