Virtual endoscopy imaging of the middle ear cavity and ossicles

Karhuketo, Tapio S.; Dastidar, Prasun; Ryymin, P. S.; Laasonen, E. M.; Puhakka, H

doi:10.1007/s004050100410

Cited by 20 publications

(10 citation statements)

References 9 publications

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“…Especially the Wrst three, widely used in the clinic, have been proved to be valuable, respectively [1][2][3][4][5][6][7][8][9][10][11]. However, there has been a dearth of literature on the comparison of the three protocols for the ossicles.…”

Section: Introductionmentioning

confidence: 98%

3D image of the middle ear ossicles: three protocols of post-processing based on multislice computed tomography

Zhang

Sha

Wang

et al. 2010

Eur Arch Otorhinolaryngol

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The aim of this study was to examine and assess the comparative values of HRCT-based multiplanar reformation (MPR), volume rendering (VR) and virtual endoscope built on three-dimensional shaded-surface display (SSD-based CTVE) for evaluations of the ossicular chain. The normal pure tone audiograms, type-A tympanogram, and normal HRCT characteristics of 32 human ears of 18 patients were reviewed, whose ossicular chains were reconstructed with the three aforementioned protocols and assessed via the 3-point scoring system. The HRCT-based protocols could demonstrate a 3D image of the ossicular chain, except that of the footplate on the SSD-based CTVE. On the qualitative assessment, the efficacy of the MPR and VR, which were both superior to the SSD-based CTVE (P < 0.05), presented no statistical significance among the major and/or hyperdense structures (P > 0.05). As regards the lateral process of the malleus, VR was found to be significantly superior to the MPR and SSD-based CTVE (P < 0.05), both of which, however, showed no significant comparative differences (P > 0.05). Moreover, the three protocols in terms of efficacy were comparatively different in their representations of the anterior crus and footplates of the stapes, respectively (P < 0.05). On the MPR images, not all the images of the lenticular process were ideal; 20 of 32 cases were detected, but not defined. VR could be the more valuable protocol for the 3D reconstruction of the ossicular chain and ought to be more employed in future, especially for the education.

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Section: Introductionmentioning

confidence: 98%

3D image of the middle ear ossicles: three protocols of post-processing based on multislice computed tomography

Zhang

Sha

Wang

et al. 2010

Eur Arch Otorhinolaryngol

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“…In comparison with most of the previous studies [1,2,4,6,[14][15][16] where virtual otoscopy was done in well-aerated ears with high inherent contrast between the density of the air and the ossicles, we attempted this imaging technique in cases of CSOM where the ossicular chain is buried in the mass of cholesteatoma. The technique was quite difficult and it was based only on the subtle difference between the density of the ossicles and that of the surrounding cholesteatoma.…”

Section: Discussionmentioning

confidence: 98%

Is there a role for virtual otoscopy in the preoperative assessment of the ossicular chain in chronic suppurative otitis media? Comparison of HRCT and virtual otoscopy with surgical findings

et al. 2009

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The aim of this study was to assess the role of virtual otoscopy and 3D ossicular reconstruction in the preoperative assessment of the ossicles in chronic suppurative otitis media. Thirty three patients of chronic suppurative otitis media with conductive deafness (air-bone gap > 35 dB) were included in this prospective study. All patients underwent axial multidetector CT. The axial CT data set was utilized for multiplanar 2D reformations as well as virtual otoscopy (VO) and 3D reconstructions. The imaging findings on these two techniques were read independently by two radiologists with respect to different parts of the ossicular chain by using a three-point scoring system and were compared with surgical findings. Both imaging techniques had comparable accuracy for evaluation of larger ossicular parts. However, for evaluation of stapes superstructure, VO/3D images were more accurate (85.29%) than 2D images (76.97%). Assessment of the lenticular process and incudostapedial joint by HRCT and 2D reformatted images was not reliable (P > 0.1); however, significant correlation (P < 0.001) was present between VO/3D and the operative findings. Virtual otoscopy improves evaluation of the ossicular chain particularly that of smaller structures such as the lenticular process, incudostapedial joint and stapes superstructure which may influence decisions regarding planning of ossiculoplasty.

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“…Other uses of virtual endoscopy in this domain are in the field of training (4,5,10). Postoperative control imaging has also been reported to benefit from this technique (7,10). In all these cases, obtaining images similar to those typically observed during surgical procedure fastens and enhances their analysis (10).…”

Section: Figmentioning

confidence: 96%