Stieglitz, Lennart; Ayer, Christian; Schindler, Kaspar Anton; Oertel, Markus Florian; Wiest, Roland; Pollo, Claudio (2014). Improved Localization of Implanted Subdural Electrode Contacts on MRI Using an Elastic Image Fusion Algorithm in Invasive EEG Recording. Neurosurgery, 10 Suppl 4, pp. 506-512. Lippincott Williams & Wilkins 10.1227/NEU.0000000000000473
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BACKGROUND:
Accurate projection of implanted subdural electrode contacts in presurgical evaluation of pharmacoresistant epilepsy cases by invasive EEG is highly relevant. Linear fusion of CT and MRI images may display the contacts in the wrong position due to brain shift effects.
OBJECTIVE:
A retrospective study in five patients with pharmacoresistant epilepsy was performed to evaluate whether an elastic image fusion algorithm can provide a more accurate projection of the electrode contacts on the pre-implantation MRI as compared to linear fusion.
METHODS:
An automated elastic image fusion algorithm (AEF), a guided elastic image fusion algorithm (GEF), and a standard linear fusion algorithm (LF) were used on preoperative MRI and post-implantation CT scans. Vertical correction of virtual contact positions, total virtual contact shift, corrections of midline shift and brain shifts due to pneumencephalus were measured.
RESULTS:
Both AEF and GEF worked well with all 5 cases. An average midline shift of 1.7mm (SD 1.25) was corrected to 0.4mm (SD 0.8) after AEF and to 0.0mm (SD 0) after GEF. Median virtual distances between contacts and cortical surface were corrected by a significant amount, from 2.3mm after LF to 0.0mm after AEF and GEF (p<.001). Mean total relative corrections of 3.1 mm (SD 1.85) after AEF and 3.0mm (SD 1.77) after GEF were achieved. The tested version of GEF did not achieve a satisfying virtual correction of pneumencephalus.
CONCLUSION:
The technique provided a clear improvement in fusion of pre- and post-implantation scans, although the accuracy is difficult to evaluate.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurosurgery 04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic and Interventional Neuroradiology 04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurology |
UniBE Contributor: |
Stieglitz, Lennart, Schindler, Kaspar Anton, Oertel, Markus Florian, Wiest, Roland Gerhard Rudi, Pollo, Claudio |
Subjects: |
600 Technology > 610 Medicine & health |
ISSN: |
0148-396X |
Publisher: |
Lippincott Williams & Wilkins |
Language: |
English |
Submitter: |
Valentina Rossetti |
Date Deposited: |
10 Sep 2014 16:49 |
Last Modified: |
02 Mar 2023 23:25 |
Publisher DOI: |
10.1227/NEU.0000000000000473 |
PubMed ID: |
24978648 |
BORIS DOI: |
10.7892/boris.58185 |
URI: |
https://boris.unibe.ch/id/eprint/58185 |
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