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Observation of Foramina Within Internal Auditory Canal Fundus with CT Virtual Endoscopy

Author: SunShanShan
Tutor: GongRuoZuo；WangTao
School: Shandong University
Course: Medical Imaging and Nuclear Medicine
Keywords: Tomography , X - ray computed Convolution coefficients Virtual Endoscopy The internal auditory canal Neural foramen
CLC: R816.96
Type: Master's thesis
Year: 2008
Downloads: 31
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Abstract

Objective: To optimize the reconstruction parameters listen to the nerve in the bottom of the channel pore virtual endoscopy imaging, multi-slice spiral CT virtual endoscopy imaging method to display the normal anatomy of the neural tube hole in the end of the internal auditory canal and developmental abnormalities, and analyze a variety of internal auditory canal the end of neural tube hole hypoplasia simulation endoscopic findings. MATERIALS AND METHODS: normal group, 50 patients (100 ears), 57 were male and 43 females, aged 2 years old -62 years old, all cases were confirmed by clinical examination without inner ear disease. Listen to the display of the channel bottom nerve pore the different convolution coefficients reconstructed image compares the application of virtual endoscopy of the reconstructed image obtained by convolution coefficients observed. Road at the end of the simulation endoscopic findings and select the with Virtual Endoscopy observed listening to the best reconstruction of the bottom of the channel neural tube the Kong Suoji in the reconstructed image convolution coefficients observed normal listening. Abnormal group of 20 patients (25 ears), 13 males and 7 females, aged 3-18 years old, are congenital deafness patients, HRCT and MRI revealed the end of the internal auditory canal malformations. Display listen to stomatal development of neural tube in the bottom of the channel type of the exception in the application of virtual endoscopy image convolution coefficients based on optimal reconstruction observe the shape and position of the foramen. In results: 1.kernel value on the reconstructed image in the B60 sharp and U70 very sharp application the Virtual Endoscopy observed listening the best the channel bottom nerve pore effect; 2. Normal group virtual endoscopy showed normal ear, the internal auditory canal bottom The neural tube hole 5 hole, its shape, location and adjacent visual display; abnormal group listen to the channel bottom structure disorders, neural foramen absent 9 ear, the internal auditory canal at the end only a single neural foramen ear; shows two the nerve hole 4 ears, a hole facial nerve hole, 4-bit to listen to a hole nerve Jung; 2 ears of three neural hole, a hole facial nerve hole, bit listening to nerve Jung 2 holes; 4 neural hole 2 ears, are for cochlear nerve atresia. The internal auditory canal bottom 5 neural foramen, hole shape of the cochlear nerve abnormalities 16 ear, the cochlear nerve hole stenosis in 10 ears, the modiolus disappeared ear, other abnormal ear merge the internal auditory canal. A combination of inner ear malformation 8 ears. 25 ears in this group there are abnormal cochlear nerve stomatal simple the cochlear nerve stomatal abnormal 18 ear, the cochlear nerve canal stenosis 10 ears, Virtual Endoscopy showed spiral structure disappears, the cochlear neural tube atresia 2 ears, simulation within mirror imaging performance of cochlear area continuous bone wall, no screw hole column, the modiolus disappeared cochlear nerve foramen 6 ears. Performance of the cochlear nerve hole to expand, the Virtual Endoscopy spiral inner cavity. The auditory neural foramen absence of an ear, the auditory nerve Jung a hole ear, auditory nerve Jung 2 holes 2 ears. Conclusion: 1. Convolution kernel in the B60 sharp and the U70 very sharp when the reconstructed image obtained on the application of virtual endoscopy observation listen the channel bottom nervous pores can get the best image; 2. The virtual endoscopy stereoscopic display listen Road at the end of five neural foramen shape, position and relations with neighbors: normal cochlear the holes spiral-shaped. (3) the internal auditory the channel bottom neural tube stomatal bad performance for the single-hole, two-hole, three-hole, four-hole or foramen stenosis and expand. 4 spiral structure of the cochlear nerve hole disappearance of the characteristic of the cochlear nerve poor stomatal development.

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