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The Study of Multi-slice Computed Tomography Imaging in Infant Congenital Sensorineural Hearing Loss

Author: BianZhiQiang
Tutor: LiuYaQun
School: Shandong University
Course: Medical Imaging
Keywords: Perceptive deafness X - ray computed Temporal bone Three-dimensional Infant
CLC: R764
Type: Master's thesis
Year: 2008
Downloads: 48
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Abstract

Objective To investigate the diagnostic value of multislice spiral CT (multi-slice computed tomography, MSCT) of infant congenital deafness (sensorineural hearing loss, SNHL) about infants with congenital deafness temporal bone deformity of the incidence and characteristics of clinical provide the necessary basis. Materials and Methods 125 cases re degrees (pure tone audiometry hearing loss> 70dB) and extremely heavy degrees (pure tone audiometry hearing loss> 90dB) infants and young children (aged 8 days to 3 years old) in SNHL children using temporal bone axis-bit high-resolution MSCT scanning and multi-planar reconstruction (MPR), SIEMENS Somatom Sensmion 16 layers CT scanner and the GE Lightspeed 16 layers CT scanner, the width of the line cross-section spiral pattern scanning, scan parameters: 120kV, 120mA, collimator: 0.75mm (SIEMENS and 0.625mm GE), pitch 1.0mm, after the end of the scan line thickness of 1.0mm pitch 0.1min range 100mm interpolation reconstruction using bone algorithm reconstruction line a 50mm small field of view reconstruction, the range of interest. Using MPR reconstruction Osirix, and GE AW4.2 workstation on the inner ear, so that both sides of the inner ear structure symmetry display multi-dimensional reconstruction and amplification of the region of interest, multi-angle to more clearly show its structure, all inner ear with volume reproduction technology do VRT reconstruction. Results of 45 cases, 125 cases of infant children in the inner ear malformation, in which the the 85 ears MSCT cross-sectional image and MPR, VRT images can clearly show the location and extent of deformity, 11 ear Mondini malformation VRT image than MSCT cross-sectional images the deformity more clear. 104 cases of prelingual deaf group of children in 68 cases (131 ears) inner ear MSCT no obvious abnormalities; malformation (2 of 41 cases (77 ears) displays the inner ear bone labyrinthine malformations (including 41 ears a variety of malformations coexist): Total cavity ear): vestibular, cochlear Total cavity cystic normal development of the semicircular canals or deformity; cochlear interval hypoplasia type Ⅰ (2 ears): cochlear modiolus and the interval is missing, the formation of a cystic; 10 cases with Mondini malformation (20 ears): cochlear only 1.5 laps in the circle and collar fusion vestibular expand; vestibular - outside the semi-regulated tube malformations 27 cases (50 ears): cochlear normal, vestibular expand, semicircular canal short, the lack of such or expand; vestibular aqueduct 18 cases (36 ears): vestibular aqueduct opening to expand was bell-shaped, more than the adjacent posterior semicircular canal and communicates with the vestibular aqueduct diameter; auditory canal malformation 6 patients (8 ears): narrow or expand the internal auditory canal; prelingual deaf group 4 cases (5 ears): external auditory canal immature the aural atresia bone plate was unreasonable; naked 17 ear associated with facial nerve canal labyrinthine segment, 33 ears with secretory otitis media. 21 cases of post-lingual deaf group basically normal inner ear structure of the 13 cases (26 ears), including four cases (6 ears) for large vestibular aqueduct syndrome, 3 patients (6 ears) with secretory otitis media. The inner ear malformation highest incidence of vestibular semicircular canal malformation (60.0%), followed by vestibular aqueduct (51.8%), Mondini malformation is also more common (23.5%), and both bilateral disease. Prelingually deaf children with inner ear malformations high incidence (37.0%), and more labyrinthine malformations; language deaf of allegiance children inner ear malformation incidence is lower (19.0%) are pure vestibular aqueduct. Foreign microtia generally do not merge ear malformation, ossicular malformations. Conclusion (1) MSCT improve the spatial resolution of the cross-sectional images and MPR, VRT image MSCT cross-section spiral scanning and MPR restructuring, well the anatomy of the temporal bone abnormalities in children with congenital deafness, VRT in an intuitive, three-dimensional display the bony labyrinth malformations space morphology, and can be observed by rotating the multi-faceted deformed morphology, MSCT scanning with VRT to improve inner ear bone to get lost deformity detection rate and diagnostic accuracy of the diagnosis of the cause of the infant SNHL of great value. (2) research in this group we draw infant inner ear malformations distribution characteristics: a variety of inner ear malformations coexist more common, more common in vestibular - half regulations tube malformations, vestibular and semi regulations tube of expansion, vestibular and semi regulations tube fusion malformations such as, multi-merge other deformities vestibular aqueduct expand incidence is also higher, mostly bilateral, half of the merger Mondini malformation, and other inner ear malformation is relatively rare. High incidence of pre-lingual deaf children with inner ear malformations, mostly inner ear malformation; deaf children with inner ear malformations lower incidence of post-lingual, multi-pure vestibular aqueduct. Foreign microtia generally do not merge inner ear malformation, but often ossicular malformations. (3) MSCT clinical treatment, the cochlear implantation indications choice provides an important basis. And provide richer information for the postoperative follow-up.

The Study of Multi-slice Computed Tomography Imaging in Infant Congenital Sensorineural Hearing Loss

Abstract

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