正常成人内耳系统液体容积的磁共振测量与分析

目的 探讨磁共振三维水成像技术在内耳液体容积测量中的应用价值.方法 30例正常成人志愿者均采用GE1.5T磁共振机、8通道头部相控阵线圈,行内耳内听道水成像序列扫描(三维真稳态进动快速成像序列),所采集信号传送至工作站AW4.2进行多平面重建和容积重建,测量耳蜗、前庭-半规管和内听道容积,初步建立其正常值范围,并分别比较耳别、性别及年龄段间有无差异.结果 30例(60耳)正常志愿者的耳蜗、前庭-半规管和内听道容积分别为(101.2±11.1)mm3、(151.5±19.9)mm3和(220.1±58.7) mm3;正常值范围分别为(79.4～123.0)mm3、(112.5～190.5)mm3和(105.0～335.2)mm3;变异系数分别为0.11、0.13和0.27.内耳系统液体容积在耳别、性别及年龄段间差异均无统计学意义(P＞0.05).结论磁共振三维水成像技术可用于活体内耳系统液体容积的测量,为临床上内耳腔道结构的评估及内耳畸形的分类、分型提供影像解剖学依据.

Determination of the volumes of inner ear and internal auditory canal fluid in thirty normal adults using magnetic resonance hydrography

Objective To evaluate the value of magnetic resonance hydrography in the determination of the volumes of inner ear and internal auditory canal fluid. Methods Three-dimensional fast imaging employing steady state acquisition magnetic resonance images of thirty normal adults（sixty ears）were performed by using GE1.5T and eight-channel head coil, then sent to AW4.2 workstation to establish optimal observation plane using multiplanar reconstruction（MPR）and three-dimensional volume reconstruction，to measure the volumes of inner ear and internal auditory canal and establish a preliminary range of normal value. Meanwhile the volumes of inner ear and internal auditory canal with regard to gender, ear-side and age were analyzed respectively. Results The volumes and range of normal value of cochlea,semicircular canal-vestibule and internal auditory canal in thirty normal adults were (101.2±11.1)mm3 and (79.4-123.0)mm3,(151.5±19.9)mmSUP>3 /SUP>and (112.5-190.5)mmSUP>3/SUP>,(220.1±58.7)mmSUP>3 /SUP>and (105.0-335.2)mmSUP>3/SUP>, respectively.The coefficients of variation were 0.11,0.13 and 0.27, respectively. There was no significant difference among the volumes of inner ear and internal auditory canal with regard to gender, ear-side and age（EM>P/EM>＞0.05）.Conclusion Magnetic resonance hydrography may serve as a preferable objective measure for assessing the volumes of inner ear and inte