Three-Dimensional Imaging of the Temporal Bone using Helical CT in Cochlear Implant Patients

Himi, Tetsuo; Kataura, Akikatsu; Sakata, Masato; Odawara, Yoshihiro; Satoh, Jun‐ichi; Sawaishi, M.

doi:10.1159/000058953

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…This condition of incudal pseudocontinuity produced by the intact periosteum creates a surgical and radiological diagnostic trap [18]. In this situation (as in cases 3,6,8,10), one possible procedure to detect the obscure lesion is proposed in this study. The VE image with the fixed CT value did not allow differentiation between the fibrous pseudocontinuity and intact bone of incus or crural lesions.…”

Section: Discussionmentioning

confidence: 98%

“…Several three-dimensional (3D) reconstruction techniques have recently been applied to the temporal bone to facilitate indentation of middle ear and inner ear anatomy [2][3][4][5][6]. Surface shaped display (SSD), one of the 3D reconstruction methods, using helical CT scan, is of diagnostic An estimation was made with additional diagnostic procedures as described in the 'Methods' section.…”

Section: Introductionmentioning

confidence: 99%

“…value in ossicular disorder, cochlear anomaly and cochlear implantation [2][3][4]6]. However, that system yields little additional information in proportion to the cost and time required, so it is only used for selected patients.…”

Section: Introductionmentioning

confidence: 99%

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Middle Ear Imaging Using Virtual Endoscopy and Its Application in Patients with Ossicular Chain Anomaly

Himi¹,

Sakata

Shintani³

et al. 2000

ORL

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Virtual endoscopy (VE) is a recently developed technique to provide a realistic surface rendering of various organs, which can be applied to the use of three-dimensional (3D) studies of several lesions. However, its advantages in otological disease have not been well investigated. In this study, we evaluated the application of VE in patients with ossicular chain anomalies. Virtual middle ear endoscopy was a time-saving method, however, we needed the appropriate technical procedures of algorithm and reconstruction spacing to generate accurate 3D images of ossicles. We obtained virtual surgical views of middle ear structures and related anomalies, and confirmed by intraoperative findings that these images were mostly compatible with the actual lesions of ossicles. VE allowed an identification of the anatomy of the ossicles and adjacent structures simultaneously. The elements of the stapedial crura were clearly visualized with VE images in 93.3% of normal ears. Pathological ossicular chain findings such as malleus or incus fixation, dislocation and disruption, except footplate fixation were investigated successfully. One possible procedure, using alterable CT value in the obtained VE images on the monitor, is proposed for further detection of fine lesions of the ossicles. These observations suggest that virtual middle ear simulations accurately represent major intraoperative findings. This technique may have an important role in preoperative planning, surgical training, and/or postoperative evaluation in otology.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Middle Ear Imaging Using Virtual Endoscopy and Its Application in Patients with Ossicular Chain Anomaly

Himi¹,

Sakata

Shintani³

et al. 2000

ORL

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“…Reconstruction 3D images allow further visual recognition of fine structures of the temporal bone [5]. Normal temporal bone and patients with cochlear implant were scanned in the helical scan mode.…”

Section: Introductionmentioning

confidence: 99%

Virtual endoscopy imaging of the middle ear cavity and ossicles

Karhuketo¹,

Dastidar

Ryymin

et al. 2002

Eur Arch Otorhinolaryngol

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Ten cadaver temporal bone blocks were studied with high-resolution computed tomography (HRCT) in order to produce topographic images, which are more informative than ordinary CT slices. Virtual endoscopic images were produced with separate, commercially available software, paying attention to the middle ear cavity and ossicles. Four major viewing locations for virtual endoscopy (the ear canal, hypotympanum, attic and eustachian tube) developed images acceptably. The malleus and incus were visualized properly. Small structures such as the lenticular process and the stapes sometimes failed to have good imaging. The eustachian tube and attic virtual views, which are usually not receptive to ordinary endoscopy, gave proper visualization of middle ear structures. Even the smallest structure, the stapes, can produce a virtual image.Virtual endoscopic images, or topographic images, of the middle ear and ossicles contribute to the understanding of the anatomy of the middle ear, thus enhancing the chances for successful surgery.

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“…Imaging poses numerous challenges to accurately determining the spatial relationship of the electrode within scala tympani, including limitations in the spatial resolution of advanced imaging modalities and imaging artifacts resulting from electrode metals (cf., Postnov et al, 2006;Verbist et al, 2005;Aschendorff et al, 2005;Aschendorff et al, 2004). Newer reconstruction schemes are constantly being explored to enhance diagnostic efficacy (Karino et al, 2004;Bettman et al, 2003;Himi et al, 1997).…”

mentioning

confidence: 99%

Optimization of TACT Imaging Protocols for in situ Visualization of Cochlear Electrode Arrays in Cat Temporal Bones

Sakata

Hareyama²,

Heil³

et al. 2007

Ear &Amp; Hearing

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Precise determination of the location of cochlear implant electrodes in situ is critical to understanding the factors influencing efficacy of electrical stimulation of the deaf ear. Renderings generated with the TACT algorithm produce 3D images permitting visualization of implant electrode features and anatomic details with resolution sufficient to accurately localize electrode contacts within scala tympani. The quality of resulting images, evaluated as a function of image contrast, improved with a larger number of BIs in the reconstruction. Wider projection angles also improved image detail in addition to generating thinner slices. Any loss in contrast was compensated for by the number of BIs. TACT can thus be optimized to provide useful data to help characterize the location of intracochlear electrode arrays.

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Three-Dimensional Imaging of the Temporal Bone using Helical CT in Cochlear Implant Patients

Cited by 4 publications

References 3 publications

Middle Ear Imaging Using Virtual Endoscopy and Its Application in Patients with Ossicular Chain Anomaly

Middle Ear Imaging Using Virtual Endoscopy and Its Application in Patients with Ossicular Chain Anomaly

Virtual endoscopy imaging of the middle ear cavity and ossicles

Optimization of TACT Imaging Protocols for in situ Visualization of Cochlear Electrode Arrays in Cat Temporal Bones

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