Related diameter measurement of geniculate fossa of facial nerve canal on multislice spiral CT images and its clinical value

LI Yu-hua; YU Ke-wen; HE Bing; GONG Ruo-zhen

Journal of China Clinic Medical Imaging ›› 2012, Vol. 23 ›› Issue (11) : 769-772.

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Related diameter measurement of geniculate fossa of facial nerve canal on multislice spiral CT images and its clinical value

LI Yu-hua1, YU Ke-wen2, HE Bing1, GONG Ruo-zhen3

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Abstract

Objective: The measure the related diameters of geniculate fossa of facial nerve canal in normal subject and to establish the normal value range to provide an objective basis for the diagnosis of the geniculate fossa enlargement. Materials and Methods: One hundred CT examinations of normal temporal bone were collected. Four kinds of special orientation imagings(image Ⅰ~Ⅳ) were obtained using mutiplanar reformation(MPR). The achievement ratio of MPR in image Ⅲ, Ⅳ were calculated. Five kinds of lines were designed to measure the geniculate fossa namely A, B, C, D, E. Data were recorded in accordance with the different age, sex and side group. Statistical analysis was done to analyze difference between the group of different age, sex and side. The 95% range of normal value of the diameters were estimated. Results: Achievement ratio of MPR for image Ⅲ and Ⅳ were 96% and 97%; All diameters of geniculate fossa had difference in different age group, but had no difference in different sex and side group. The 95% range of normal value of geniculate fossa diameters were as follows: A: 2.81~2.95 mm, B: 3.23~3.35 mm, C: 1.59~1.67 mm, D: 1.62~1.71 mm, E: 3.20~3.33 mm. Conclusions: The present study was designed to measure 5 related diameters and to establish the normal value range of geniculate fossa. It provides an objective basis for the diagnosis of the geniculate fossa enlargement.

Key words

Facial nerve / Tomography / spiral computed

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LI Yu-hua;YU Ke-wen;HE Bing;GONG Ruo-zhen. Related diameter measurement of geniculate fossa of facial nerve canal on multislice spiral CT images and its clinical value[J]. Journal of China Clinic Medical Imaging. 2012, 23(11): 769-772