TY  - JOUR
A1  - Müller-Graff, Franz-Tassilo
A1  - Ilgen, Lukas
A1  - Schendzielorz, Philipp
A1  - Voelker, Johannes
A1  - Taeger, Johannes
A1  - Kurz, Anja
A1  - Hagen, Rudolf
A1  - Neun, Tilmann
A1  - Rak, Kristen
T1  - Implementation of secondary reconstructions of flat-panel volume computed tomography (fpVCT) and otological planning software for anatomically based cochlear implantation
JF  - European Archives of Oto-Rhino-Laryngology
N2  - Purpose
For further improvements in cochlear implantation, the measurement of the cochlear duct length (CDL) and the determination of the electrode contact position (ECP) are increasingly in the focus of clinical research. Usually, these items were investigated by multislice computed tomography (MSCT). The determination of ECP was only possible by research programs so far. Flat-panel volume computed tomography (fpVCT) and its secondary reconstructions (fpVCT\(_{SECO}\)) allow for high spatial resolution for the visualization of the temporal bone structures. Using a newly developed surgical planning software that enables the evaluation of CDL and the determination of postoperative ECP, this study aimed to investigate the combination of fpVCT and otological planning software to improve the implementation of an anatomically based cochlear implantation.
Methods
Cochlear measurements were performed utilizing surgical planning software in imaging data (MSCT, fpVCT and fpVCT\(_{SECO}\)) of patients with and without implanted electrodes.
Results
Measurement of the CDL by the use of an otological planning software was highly reliable using fpVCT\(_{SECO}\) with a lower variance between the respective measurements compared to MSCT. The determination of the inter-electrode-distance (IED) between the ECP was improved in fpVCT\(_{SECO}\) compared to MSCT.
Conclusion
The combination of fpVCT\(_{SECO}\) and otological planning software permits a simplified and more reliable analysis of the cochlea in the pre- and postoperative setting. The combination of both systems will enable further progress in the development of an anatomically based cochlear implantation.
KW  - interelectrode-distance
KW  - Cochlear duct length
KW  - Cochlear planning software
KW  - fpVCT
KW  - secondary reconstruction
KW  - MSCT
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-266798
SN  - 1434-4726
VL  - 279
IS  - 5
ER  - 
TY  - JOUR
A1  - Taeger, Johannes
A1  - Müller-Graff, Franz-Tassilo
A1  - Neun, Tilmann
A1  - Köping, Maria
A1  - Schendzielorz, Philipp
A1  - Hagen, Rudolf
A1  - Rak, Kristen
T1  - Highly precise navigation at the lateral skull base by the combination of flat-panel volume CT and electromagnetic navigation
JF  - Science Progress
N2  - This study aimed to evaluate the feasibility and accuracy of electromagnetic navigation at the lateral skull base in combination with flat panel volume computed tomography (fpVCT) datasets. A mastoidectomy and a posterior tympanotomy were performed on 10 samples of fresh frozen temporal bones. For registration, four self-drilling titanium screws were applied as fiducial markers. Multi-slice computed tomography (MSCT; 600 µm), conventional flat panel volume computed tomography (fpVCT; 466 µm), micro-fpVCT (197 µm) and secondary reconstructed fpVCT (100 µM) scans were performed and data were loaded into the navigation system. The resulting fiducial registration error (FRE) was analysed, and control of the navigation accuracy was performed. The registration process was very quick and reliable with the screws as fiducials. Compared to using the MSCT data, the micro-fpVCT data led to significantly lower FRE values, whereas conventional fpVCT and secondary reconstructed fpVCT data had no advantage in terms of accuracy. For all imaging modalities, there was no relevant visual deviation when targeting defined anatomical points with a navigation probe. fpVCT data are very well suited for electromagnetic navigation at the lateral skull base. The use of titanium screws as fiducial markers turned out to be ideal for comparing different imaging methods. A further evaluation of this approach by a clinical trial is required.
KW  - electromagnetic navigation
KW  - fpVCT
KW  - fiducial registration error
KW  - lateral skull base
KW  - otology
KW  - cochlear implantation
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-250268
SN  - 2047-7163
VL  - 104
IS  - 3
ER  -