Width of the normal facial canal measured by high-resolution cone-beam computed tomography

Komori, Masahiro; Yamada, Kazuomi; Hinohira, Yasuyuki; Aritomo, Hiroshi; Yanagihara, Naoaki

doi:10.3109/00016489.2013.816443

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…The mean angle was 22.6 ± 10° and the distance of the electrode to the bony canal of the facial nerve was about 1.8 mm with a thickness of the bony coverage of about 0.8 mm. The diameter of the facial nerve canal was determined at 1.8 mm and is in principal accordance with other studies 31 . Interestingly, a significant difference in the diameter of facial nerve canal could be detected between groups.…”

Section: Discussionsupporting

confidence: 79%

Possibilità di differenziazione degli elettrodi cocleari nelle misurazioni radiologiche della posizione intracocleare e dell'angolo cordo-facciale

Diogo

Walliczeck

Taube

et al. 2016

Acta Otorhinolaryngol Ital

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Con l'incremento del numero di impianti cocleari effettuati, il controllo di qualità è divenuto sempre più importante. Oltre alle misurazioni biofisiche intraoperatorie ci si può avvalere dell'imaging radiologico. Una nuova tecnica utilizzata in questo campo è il Cone Beam CT (CBCT). Nel presente studio sono stati valutati 65 casi (35 Nucleus Contour AdvanceCochlear; 30 Flex SoftMedEl) studiati mediante CBCT (Accu-I-tomo F17, Morita, Kyoto, Japan). Nello specifico sono stati rilevati: l'angolo di inserzione, l'altezza dell'impianto, la distanza dell'elettrodo dalla parete mediale o laterale, l'angolo tra la corda del timpano e il nervo facciale e la posizione precisa del filo dell'elettrodo nell'angolo cordo-facciale. È stato inoltre possibile valutare la differenza tra il decorso peri-modiolare e laterale degli elettrodi. I dati presentati dimostrano l'accuratezza e il vantaggio della CBCT nella visualizzazione di piccole strutture grazie al ridotto numero di artefatti da indurimento del fascio. Inoltre nel 75% dei pazienti è stato possibile visualizzare l'angolo tra la corda del timpano e il nervo facciale. È stato possibile notare differenze significative fra i vari tipi di elettrodo in funzione del tipo di rapporto con il nervo facciale. In conclusione mediante la CBCT è possibile ottenere una visualizzazione precisa e dettagliate misurazioni della posizione intracocleare dei diversi elettrodi. È persino possibile la corretta valutazione della posizione dell'elettrodo rispetto all'angolo cordo- facciale. La CBCT è quindi, dal nostro punto di vista, un utile strumento per il controllo intra e post-operatorio degli impianti cocleari.

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Section: Discussionsupporting

confidence: 79%

Possibilità di differenziazione degli elettrodi cocleari nelle misurazioni radiologiche della posizione intracocleare e dell'angolo cordo-facciale

Diogo

Walliczeck

Taube

et al. 2016

Acta Otorhinolaryngol Ital

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“…13 In other parts of the horizontal and vertical segments, ossification has delayed, which causes the dehiscence of the bony wall. 11 In the present study, we investigated the relationship between mastoid pneumatization and CP, and the neighboring structures. Because the facial nerve has been found to pass behind the CP and the tensor tympani, it has been recently concluded that the CP is a useful landmark to locate the facial nerve.…”

Section: Discussionmentioning

confidence: 99%

“…After that, it gradually becomes narrower to the level of the stapes and enlarges to the stylomastoid foramen. 11 Ge and Spector 12 reported that ossification on the facial canal labyrinthine segment occurs before the 15th week of pregnancy. Similarly, ossification is performed in the CP, from the 20th week to the 22nd week of pregnancy.…”

Section: Discussionmentioning

confidence: 99%

Can MDCT Scan of the Temporal Bone Looking at Pneumatization Predict Surgical Vulnerability of the Facial Nerve?

et al. 2019

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Objectives: The aim of this study is to investigate the scutum–cochleariform process (CP) and scutum–promontorium distances according to the mastoid pneumatization condition. Methods: Two hundred temporal multidetector computed tomography scans (90 males and 110 females) were evaluated retrospectively. The scutum-CP and scutum–promontorium distances were measured. Facial canal dehiscence (FCD) in the tympanic segment and mastoid pneumatization were also evaluated. Results: The distances between scutum-CP and scutum–promontorium were not different between males and females and between right and left sides. Facial canal dehiscence in the tympanic segment was detected: 5.6% (right) and 7.8% (left) in males and 5.5% (right) and 10.0% (left) in females. Grade 4 (100%) pneumatization was detected mainly in 55.6% to 57.8% of the patients in both genders. Grade 0 (0%) pneumatization (sclerosis) was detected in 22.2% to 28.2% of both males and females. In more pneumatized mastoids, the scutum-CP and scutum–promontorium distances increased. In sclerotic mastoids, the scutum-CP and scutum–promontorium distances decreased. Facial canal dehiscence rates were not related to the mastoid pneumatization levels. Conclusion: Cochleariform process is an important landmark to localize the tympanic segment of the facial canal. In sclerosed mastoids, scutum-CP and scutum–promontorium distances decreased. There was no relationship between FCD rates and mastoid pneumatization levels. It may be due to the development of FCD that occurs during the intrauterine period. In endoscopic and classic ear surgeries, mastoid pneumatization must be evaluated preoperatively to avoid facial nerve injuries.

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“…In addition to imaging, intraoperative measuring of stapedius reflex threshold values indicate the correct placement of the electrodes [8]. Cone Beam Computed Tomography (CBCT) offers a low-radiation and cost-effective alternative to conventional CT, while also being superior in visualizing highdensity structures, such as the temporal bone [9]. CBCT provides a reduction of the effective dose of up to 40% of a 64-slice CT [10] and comparable radiation dose to a 128slice CT, but with higher image quality compared to both due to the higher spatial resolution [11,13].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of artifacts of cochlear implant electrodes in cone beam computed tomography

Bevis

Effertz

Beutner

et al. 2020

Eur Arch Otorhinolaryngol

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Purpose Cone Beam Computed Tomography (CBCT) offers a valid alternative to conventional Computed Tomography (CT). A possible radiation dose reduction with the use of CBCT in postoperative imaging of CIs is of great importance. Whether the visualization of Cochlear Implant (CI) electrodes in CBCT correlates with the radiation dose applied was investigated in this study. Methods We compared the visualization quality of Contour Advance CIs to Straight CIs from Cochlear using CBCT with varying tube parameters on whole-head specimen. Results The internal diameter of the cochlea decreases from base to apex, resulting in a significantly different intracochlear positioning of the two tested CI models. While electrodes of the Contour Advance series are located close to the modiolus, thus closer to the spiral ganglion neurons, those of the Straight series are located further away. The artifact portion of the electrode amounts to 50–70% of the radiological diameter of the electrode. An increase in artifact portion from the base (electrode #1 approx. 50%) to the apex (electrode #20 approx. 70%) of the cochlea was observed. The visualization of electrodes in the medial and apical part of the cochlea is limited due to artifact overlapping. There was no correlation between the artifact size and the applied radiation dose. Conclusion The results indicate that a reduction of the radiation dose by up to 45% of the currently applied radiation dose of standard protocols would be possible. Investigations of the effects on subjective image quality still need to be performed.

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Width of the normal facial canal measured by high-resolution cone-beam computed tomography

Cited by 11 publications

References 12 publications

Possibilità di differenziazione degli elettrodi cocleari nelle misurazioni radiologiche della posizione intracocleare e dell'angolo cordo-facciale

Possibilità di differenziazione degli elettrodi cocleari nelle misurazioni radiologiche della posizione intracocleare e dell'angolo cordo-facciale

Can MDCT Scan of the Temporal Bone Looking at Pneumatization Predict Surgical Vulnerability of the Facial Nerve?

Evaluation of artifacts of cochlear implant electrodes in cone beam computed tomography

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