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  • 1
    Online Resource
    Online Resource
    Transimpedance Matrix (TIM) Measurement for the Detection of Intraoperative Electrode Tip Foldover Using the Slim Modiolar Electrode: A Proof of Concept Study
    Ovid Technologies (Wolters Kluwer Health) ; 2021
    In:  Otology & Neurotology Vol. 42, No. 2 ( 2021-02), p. e124-e129
    Details
    In: Otology & Neurotology, Ovid Technologies (Wolters Kluwer Health), Vol. 42, No. 2 ( 2021-02), p. e124-e129
    Abstract: The aim of this study is to report on our preliminary experience with Transimpedance Matrix (TIM)-measurement for the detection of cochlear implant electrode tip foldovers compared with intraoperative imaging in patients implanted with the slim modiolar electrode (SME). Study Design: Proof of concept study. Setting: Tertiary university referral center. Patients: Twenty five ears (in 22 patients) implanted consecutively with the SME. Intervention(s): Following cochlear implantation, intraoperative TIM-measurement and fluoroscopy were performed. One week postoperatively, the electrode position was evaluated using Computed Tomography (CT)-imaging. Main Outcome Measures: Electrode array tip foldover. Results: Electrode array tip foldover occurred in three of the 25 cochlear implantations performed (12%). In each case, the foldover was detected by both TIM and fluoroscopy, leading to reposition and correct intracochlear placement of the array. Conclusions: TIM-measurement is a promising method for the intraoperative detection of an electrode array tip foldover. The TIM-tool with intuitive heatmap display is easy to use, fast, and readily available to clinics using TIM-software in the operating theatre.
    Type of Medium: Online Resource
    ISSN: 1531-7129 , 1537-4505
    URL: Article
    DOI: 10.1097/MAO.0000000000002875
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2021
    detail.hit.zdb_id: 2058738-7
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  • 2
    Online Resource
    Online Resource
    Automated 2‐Dimensional Measurement of Vestibular Schwannoma: Validity and Accuracy of an Artificial Intelligence Algorithm
    Wiley ; 2023
    In:  Otolaryngology–Head and Neck Surgery
    Details
    In: Otolaryngology–Head and Neck Surgery, Wiley
    Abstract: Validation of automated 2‐dimensional (2D) diameter measurements of vestibular schwannomas on magnetic resonance imaging (MRI). Study Design Retrospective validation study using 2 data sets containing MRIs of vestibular schwannoma patients. Setting University Hospital in The Netherlands. Methods Two data sets were used, 1 containing 1 scan per patient (n = 134) and the other containing at least 3 consecutive MRIs of 51 patients, all with contrast‐enhanced T1 or high‐resolution T2 sequences. 2D measurements of the maximal extrameatal diameters in the axial plane were automatically derived from a 3D‐convolutional neural network compared to manual measurements by 2 human observers. Intra‐ and interobserver variabilities were calculated using the intraclass correlation coefficient (ICC), agreement on tumor progression using Cohen's kappa. Results The human intra‐ and interobserver variability showed a high correlation (ICC: 0.98‐0.99) and limits of agreement of 1.7 to 2.1 mm. Comparing the automated to human measurements resulted in ICC of 0.98 (95% confidence interval [CI]: 0.974; 0.987) and 0.97 (95% CI: 0.968; 0.984), with limits of agreement of 2.2 and 2.1 mm for diameters parallel and perpendicular to the posterior side of the temporal bone, respectively. There was satisfactory agreement on tumor progression between automated measurements and human observers (Cohen's κ  = 0.77), better than the agreement between the human observers (Cohen's κ  = 0.74). Conclusion Automated 2D diameter measurements and growth detection of vestibular schwannomas are at least as accurate as human 2D measurements. In clinical practice, measurements of the maximal extrameatal tumor (2D) diameters of vestibular schwannomas provide important complementary information to total tumor volume (3D) measurements. Combining both in an automated measurement algorithm facilitates clinical adoption.
    Type of Medium: Online Resource
    ISSN: 0194-5998 , 1097-6817
    URL: Article
    DOI: 10.1002/ohn.470
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2008453-5
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  • 3
    Online Resource
    Online Resource
    The evaluation of a slim perimodiolar electrode: surgical technique in relation to intracochlear position and cochlear implant outcomes
    Springer Science and Business Media LLC ; 2020
    In:  European Archives of Oto-Rhino-Laryngology Vol. 277, No. 2 ( 2020-02), p. 343-350
    Details
    In: European Archives of Oto-Rhino-Laryngology, Springer Science and Business Media LLC, Vol. 277, No. 2 ( 2020-02), p. 343-350
    Abstract: In cochlear implantation (CI), the two factors that are determined by the surgeon with a potential significant impact on the position of the electrode within the cochlea and the potential outcome, are the surgical technique and electrode type. The objective of this prospective study was to evaluate the position of the slim, perimodiolar electrode (SPE), and to study the influence of the SPE position on CI outcome. Methods Twenty-three consecutively implanted, adult SPE candidates were included in this prospective cohort study conducted between December 2016 and April 2019. Mean age at surgery was 59.5 years. Mean preoperative residual hearing was 92.2 dB. Intra-operative fluoroscopy and high-resolution computed tomography scans were performed to evaluate electrode position after insertion using a cochleostomy (CS) approach. Follow-up was 12 months after implantation; residual hearing (6–8 weeks) and speech perception (6–8 weeks and 12 months) were evaluated in relation to the intracochlear SPE position. Results In most patients in whom the SPE was positioned in the s cala tympani residual hearing was preserved [mean absolute increase in PTA of 4.4 dB and 77.2% relative hearing preservation (RHP%)]. Translocation into the scala vestibuli occurred in 36% of the insertions, resulting in a mean absolute increase in PTA of 17.9 dB, and a RHP% of 19.2%. Participants with a translocation had poorer speech perception scores at 12-month follow-up. Conclusion Given the incidence of CS-associated translocations with the SPE and the negative effect on outcome, it is advised to insert the SPE using the (extended) round window approach.
    Type of Medium: Online Resource
    ISSN: 0937-4477 , 1434-4726
    URL: Article
    DOI: 10.1007/s00405-019-05696-y
    RVK:
    XA 26650
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 1459042-6
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  • 4
    Online Resource
    Online Resource
    Variations in cochlear duct shape revealed on clinical CT images with an automatic tracing method
    Springer Science and Business Media LLC ; 2017
    In:  Scientific Reports Vol. 7, No. 1 ( 2017-12-14)
    Details
    In: Scientific Reports, Springer Science and Business Media LLC, Vol. 7, No. 1 ( 2017-12-14)
    Abstract: Cochlear size and morphology vary greatly and may influence the course of a cochlear implant electrode array during insertion and its final intra-cochlear position. Detailed insight into these variations is valuable for characterizing each cochlea and offers the opportunity to study possible correlations with surgical or speech perception outcomes. This study presents an automatic tracing method to assess individual cochlear duct shapes from clinical CT images. On pre-operative CT scans of 479 inner ears the cochlear walls were discriminated by interpolating voxel intensities along radial and perpendicular lines within multiplanar reconstructions at 1 degree intervals from the round window. In all 479 cochleas, the outer wall could be traced automatically up to 720 degrees. The inner wall and floor of the scala tympani in 192 cochleas. The shape of the cochlear walls were modelled using a logarithmic spiral function including an offset value. The vertical trajectories of the scala tympani exhibited a non-monotonous spiral slope with specific regions at risk for CI-related insertion trauma, and three slope categories could be distinguished. This presented automatic tracing method allows the detailed description of cochlear morphology and can be used for both individual and large cohort evaluation of cochlear implant patients.
    Type of Medium: Online Resource
    ISSN: 2045-2322
    URL: Article
    DOI: 10.1038/s41598-017-16126-6
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2017
    detail.hit.zdb_id: 2615211-3
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  • 5
    Online Resource
    Online Resource
    The Influence of Cochlear Implant Electrode Position on Performance
    S. Karger AG ; 2015
    In:  Audiology and Neurotology Vol. 20, No. 3 ( 2015), p. 202-211
    Details
    In: Audiology and Neurotology, S. Karger AG, Vol. 20, No. 3 ( 2015), p. 202-211
    Abstract: 〈 b 〉 〈 i 〉 Objectives: 〈 /i 〉 〈 /b 〉 To study the relation between variables related to cochlear implant electrode position and speech perception performance scores in a large patient population. 〈 b 〉 〈 i 〉 Design: 〈 /i 〉 〈 /b 〉 The study sample consisted of 203 patients implanted with a CII or HiRes90K implant with a HiFocus 1 or 1J electrode of Advanced Bionics. Phoneme and word score averages for the 1- and 2-year follow-up were calculated for 41 prelingually deaf and 162 postlingually deaf patients. Analyses to reveal correlations between these performance outcomes and 6 position-related variables (angle of most basal electrode contact, surgical insertion angle, surgical insertion, wrapping factor, angular insertion depth, linear insertion depth) were executed. The scalar location, as an indication for the presence of intracochlear trauma, and modiolus proximity beyond the basal turn were not evaluated in this study. In addition, different patient-specific variables (age at implantation, age at onset of hearing loss, duration of deafness, preoperative phoneme and word scores) were tested for correlation with performance. 〈 b 〉 〈 i 〉 Results: 〈 /i 〉 〈 /b 〉 The performance scores of prelingual patients were correlated with age at onset of hearing loss, duration of deafness and preoperative scores. For the postlingual patients, performance showed correlations with all 5 patient-specific variables. None of the 6 position-related variables influenced speech perception in cochlear implant patients. 〈 b 〉 〈 i 〉 Conclusions: 〈 /i 〉 〈 /b 〉 Although several patient-specific variables showed correlations with speech perception outcomes, not one of the studied angular and linear position-related variables turned out to have a demonstrable influence on performance.
    Type of Medium: Online Resource
    ISSN: 1420-3030 , 1421-9700
    URL: Article
    DOI: 10.1159/000377616
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2015
    detail.hit.zdb_id: 1481979-X
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  • 6
    Online Resource
    Online Resource
    Imaging of Inflammatory and Infectious Diseases in the Temporal Bone
    Elsevier BV ; 2009
    In:  Neuroimaging Clinics of North America Vol. 19, No. 3 ( 2009-8), p. 321-337
    Details
    In: Neuroimaging Clinics of North America, Elsevier BV, Vol. 19, No. 3 ( 2009-8), p. 321-337
    Type of Medium: Online Resource
    ISSN: 1052-5149
    URL: Article
    DOI: 10.1016/j.nic.2009.06.006
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2009
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  • 7
    Online Resource
    Online Resource
    Ultra-High-Resolution CT to Detect Intracochlear New Bone Formation after Cochlear Implantation
    Radiological Society of North America (RSNA) ; 2022
    In:  Radiology Vol. 302, No. 3 ( 2022-03), p. E15-E15
    Details
    In: Radiology, Radiological Society of North America (RSNA), Vol. 302, No. 3 ( 2022-03), p. E15-E15
    Type of Medium: Online Resource
    ISSN: 0033-8419 , 1527-1315
    URL: Article
    DOI: 10.1148/radiol.219033
    RVK:
    XA 10000
    Language: English
    Publisher: Radiological Society of North America (RSNA)
    Publication Date: 2022
    detail.hit.zdb_id: 80324-8
    detail.hit.zdb_id: 2010588-5
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  • 8
    Online Resource
    Online Resource
    Intracochlear electrode array position and cochlear implant outcomes using the nucleus slim modiolar electrode and the extended round window approach: a follow-up study
    Springer Science and Business Media LLC ; 2022
    In:  European Archives of Oto-Rhino-Laryngology Vol. 279, No. 10 ( 2022-10), p. 4735-4743
    Details
    In: European Archives of Oto-Rhino-Laryngology, Springer Science and Business Media LLC, Vol. 279, No. 10 ( 2022-10), p. 4735-4743
    Abstract: The aim of this study was to evaluate the intracochlear position of the Slim Modiolar Electrode (SME) after insertion via the extended Round Window (eRW) approach, and to correlate this with residual hearing preservation and speech perception outcomes. Methods Twenty-three adult participants, consecutively implanted with the SME via the eRW approach, were included in this prospective, single-center, observational study. Electrode position was evaluated intra-operatively using X-ray fluoroscopy and TIM measurement, and post-operatively using ultra-high resolution CT. Residual hearing [threshold shift in PTA between pre- and post-operative measurement, relative hearing preservation (RHP%)] and speech perception were evaluated at 2 and 12 months after surgery. Results In each of the 23 participants, complete scala tympani positioning of the electrode array could be achieved. In one participant, an initial tip fold-over was corrected during surgery. Average age at implantation was 63.3 years (SD 13.3, range 28–76) and mean preoperative residual hearing was 81.5 dB. The average post-operative PTA threshold shift was 16.2 dB (SD 10.8) at 2 months post-operatively, corresponding with a RHP% score of 44% (SD 34.9). At 12 months, the average RHP% score decreased to 37%. Postoperative phoneme scores improved from 27.1% preoperatively, to 72.1% and 82.1% at 2 and 12 months after surgery, respectively. Conclusion Use of the eRW approach results in an increased likelihood of complete scala tympani insertion when inserting the SME, with subsequent excellent levels of speech perception. However, residual hearing preservation was found to be moderate, possibly as a result of the extended round window approach, emphasizing that it is not an all-purpose approach for inserting this particular electrode array.
    Type of Medium: Online Resource
    ISSN: 0937-4477 , 1434-4726
    URL: Article
    DOI: 10.1007/s00405-021-07247-w
    RVK:
    XA 26650
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 1459042-6
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  • 9
    Online Resource
    Online Resource
    High Permittivity Dielectric Pads Improve High Spatial Resolution Magnetic Resonance Imaging of the Inner Ear at 7 T
    Ovid Technologies (Wolters Kluwer Health) ; 2014
    In:  Investigative Radiology Vol. 49, No. 5 ( 2014-05), p. 271-277
    Details
    In: Investigative Radiology, Ovid Technologies (Wolters Kluwer Health), Vol. 49, No. 5 ( 2014-05), p. 271-277
    Type of Medium: Online Resource
    ISSN: 0020-9996
    URL: Article
    DOI: 10.1097/RLI.0000000000000026
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2014
    detail.hit.zdb_id: 2041543-6
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  • 10
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    Online Resource
    Laryngeal Sarcoidosis: A Case Report Presenting Transglottic Involvement
    Elsevier BV ; 2013
    In:  Journal of Voice Vol. 27, No. 5 ( 2013-9), p. 647-649
    Details
    In: Journal of Voice, Elsevier BV, Vol. 27, No. 5 ( 2013-9), p. 647-649
    Type of Medium: Online Resource
    ISSN: 0892-1997
    URL: Article
    DOI: 10.1016/j.jvoice.2013.03.010
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2013
    detail.hit.zdb_id: 2111437-7
    SSG: 7,11
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