Real-time intracochlear imaging of automated cochlear implant insertions in whole decalcified cadaver cochleas using ultrasound

Landry, Thomas; Earle, Guy; Brown, Jeremy; Bance, Manohar

doi:10.1080/14670100.2018.1460024

Cited by 6 publications

(8 citation statements)

References 36 publications

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“…Thus, a system which can predict ST volume is particularly valuable. In this study, the quasi-linear positive correlation between ST volume and A-and B-values enabled creation of a predictive algorithm to facilitate pre-operative prediction of ST indicated that higher insertion speed was associated with higher insertion forces (17,18). Our findings were reflected in a study recently published by Aebischer et al (19).…”

Section: Discussionsupporting

confidence: 64%

“…The other assumption is that with larger ST volume, the helicotrema would also be larger allowing the cochlear fluid to escape from the ST to the scala vestibuli. Earlier reports by Kontorinis et al and Landry et al indicated that higher insertion speed was associated with higher insertion forces ( 17 , 18 ). Our findings were reflected in a study recently published by Aebischer et al ( 19 ).…”

Section: Discussionmentioning

confidence: 87%

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Cochlear Size Assessment Predicts Scala Tympani Volume and Electrode Insertion Force- Implications in Robotic Assisted Cochlear Implant Surgery

et al. 2021

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Objectives: The primary aim was to measure the volume of the scala tympani (ST) and the length of the straight portion of the cochlear basal turn from micro-computed tomography (μCT) images. The secondary aim was to estimate the electrode insertion force based on cochlear size and insertion speed. Both of these objectives have a direct clinical relevance in robotic assisted cochlear implant (CI) surgery.Methods: The ST was segmented in thirty μCT datasets to create a three-dimensional (3D) model and calculate the ST volume. The diameter (A-value), the width (B-value), and the straight portion of the cochlear basal turn (S-value) were measured from the oblique coronal plane. Electrode insertion force was measured in ST models of two different sizes, by inserting FLEX24 (24 mm) and FLEX28 (28 mm) electrode arrays at five different speeds (0.1, 0.5, 1, 2, and 4 mm/s).Results: The mean A-, B-, and S-values measured from the 30 μCT datasets were 9.0 ± 0.5, 6.7 ± 0.4, and 6.9 mm ± 0.5, respectively. The mean ST volume was 34.2 μl ± 7 (range 23–50 μl). The ST volume increased linearly with an increase in A- and B-values (Pearson's coefficient r = 0.55 and 0.56, respectively). The A-value exhibited linear positive correlation with the B-value and S-value (Pearson's coefficient r = 0.64 and r = 0.66, respectively). In the smaller of the two ST models, insertion forces were higher across the range of insertion speeds during both array insertions, when compared to the upscaled model. Before the maximum electrode insertion depths, a trend toward lower insertion force for lower insertion speed and vice-versa was observed.Conclusion: It is important to determine pre-operative cochlear size as this seems to have an effect upon electrode insertion forces. Higher insertion forces were seen in a smaller sized ST model across two electrode array lengths, as compared to an upscaled larger model. The ST volume, which cannot be visualized on clinical CT, correlates with clinical cochlear parameters. This enabled the creation of an equation capable of predicting ST volume utilizing A- and B-values, thus enabling pre-operative prediction of ST volume.

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Section: Discussionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 87%

Cochlear Size Assessment Predicts Scala Tympani Volume and Electrode Insertion Force- Implications in Robotic Assisted Cochlear Implant Surgery

et al. 2021

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“…The potentially easy and cost-effective implementation of HFUS during surgery to ensure damage-free visualization of the inner ear ultrastructure (23) makes it a promising imaging modality for the improvement of CI techniques. Intraoperative visibility of CI electrodes, using US imaging (24), could help detect a misplaced device, thus avoiding reoperation. Landry et al have demonstrated the feasibility of combining HFUS, automated CI insertion, and force sensing to monitor CI insertion dynamics in decalcified cadaver cochlea (24).…”

Section: Discussionmentioning

confidence: 99%

Feasibility of Cochlea High-frequency Ultrasound and Microcomputed Tomography Registration for Cochlear Computer-assisted Surgery: A Testbed

Akkari

Subsol

Zemiti

et al. 2021

Otology &Amp; Neurotology

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Indeed, in case of an error in the reconstruction of either the orientations or the interdistances between the wires, the reconstruction procedure would worsen the line segment fitting, which would then impact the model matching and finally result in a degraded accuracy value. Consequently, the metric defined in (14) enables to quantify to what extent the reconstruction procedure allows to preserve both the orientations and distance, which holds true for any structure.…”

Section: Evaluation Of System Performancesmentioning

confidence: 99%

“…Although also limited in depth, ultrasound (US) imaging allows to image further than OCT and was even shown to evaluate the functionality of the ossicles through the eardrum [11]. Besides, depending on the applied frequency, US imaging is capable to achieve sufficient spatial resolution to visualize anatomical landmarks of the ear that range from the ossicular chain [11], [12] to cochlear structures such as the basilar membrane [13], [14]. Combined with the low-cost, ease of use and safety of the corresponding imaging systems, these features make US an appropriate modality for initial contact with the patient.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized Endoscopic 2D US Transducer for Volumetric Ultrasound Imaging of the Auditory System

Lavenir

Santos

Zemiti

et al. 2023

IEEE Trans. Biomed. Eng.

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In this paper, we focus on the carrying out and validation of minimally invasive three-dimensional (3D) ultrasound (US) imaging of the auditory system, which is based on a new miniaturized endoscopic 2D US transducer. This unique probe consists of a 18 MHz 24 elements curved array transducer with a distal diameter of 4 mm so it can be inserted into the external auditory canal. Typical acquisition is achieved by rotating such a transducer around its own axis using a robotic platform. Reconstruction of a US volume from the set of acquired B-scans during the rotation is then performed using scan-conversion. The accuracy of the reconstruction procedure is evaluated using a dedicated phantom that includes a set of wires as reference geometry. Twelve acquisitions obtained from different probe poses are compared to a micro-computed tomographic model of the phantom, leading to a maximum error of 0.20 mm. Additionally, acquisitions with a cadaveric head highlight the clinical applicability of this set up. Structures of the auditory system such as the ossicles and the round window can be identified from the obtained 3D volumes. These results confirm that our technique enables the accurate imaging of the middle and inner ears without having to deteriorate the surrounding bone. Since US is a real-time, wide available and non-ionizing imaging modality, our acquisition setup could facilitate the minimally invasive diagnosis and surgical navigation for otology in a fast, costeffective and safe way.

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Real-time intracochlear imaging of automated cochlear implant insertions in whole decalcified cadaver cochleas using ultrasound

Abstract: This technique may be very useful for some studies, although the confounding effects of bone decalcification may make results of other studies too difficult to generalize. The approach could be adapted to other real-time imaging modalities, such as optical coherence tomography.

Cited by 6 publications

References 36 publications

Cochlear Size Assessment Predicts Scala Tympani Volume and Electrode Insertion Force- Implications in Robotic Assisted Cochlear Implant Surgery

Cochlear Size Assessment Predicts Scala Tympani Volume and Electrode Insertion Force- Implications in Robotic Assisted Cochlear Implant Surgery

Feasibility of Cochlea High-frequency Ultrasound and Microcomputed Tomography Registration for Cochlear Computer-assisted Surgery: A Testbed

Miniaturized Endoscopic 2D US Transducer for Volumetric Ultrasound Imaging of the Auditory System

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