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目的 探讨内耳骨迷路CT三维重建的最佳成像参数。方法 选择 2 0例临床上除外耳部病变的病人 ,采用螺旋CT薄层扫描 (1.0mm) ,比较 pitch(1.0 ,1.5 ,2 .0 )、重建算法 (标准算法、骨算法和边缘算法 )和重建间隔 (1.0mm、0 .8mm、0 .4mm、0 .2mm和 0 .1mm)对表面遮盖显示法 (surfaceshadedisplay ,SSD)三维重建图像质量的影响。制订了图像质量评分标准作为比较的半定量指标。结果 内耳骨迷路CT三维重建对外骨半规管、前骨半规管、后骨半规管、前庭、前庭窗、耳蜗、蜗窗、内耳道均可显示 ,但对前庭窗和蜗窗显示欠佳。随着 pitch值增大图像质量降低 (Ρ <0 .0 1) ;边缘算法的图像质量优于标准算法和骨算法 ;重建间隔越小图像质量越好 ,但不必过分强调太薄的重建间隔。结论 内耳骨迷路CT三维重建的最佳成像参数是 :层厚 1.0mm ,pitch 1.0 ,显示视野 4.8cm ,边缘算法重建 ,重建间隔 0 .2mm。
Objective To explore the best imaging parameters of three-dimensional reconstruction of internal ear bone in patients with labyrinthine bone. Methods Twenty patients with clinically excluded ear disease were selected and scanned by thin-section spiral CT (1.0 mm), compared with pitch (1.0, 1.5, 2.0), reconstruction algorithm (standard algorithm, bone algorithm and edge algorithm) The effect of reconstruction interval (1.0mm, 0.8mm, 0.4mm, 0.2mm and 0.1mm) on the 3D reconstructed image quality of the surfacehaded display (SSD) Developed the image quality scoring standard as a comparison of semi-quantitative indicators. Results Three-dimensional reconstruction of the internal ear bone labyrinth CT showed that the semicircular canals, semimetal semicircular canal, posterior semimetal, vestibular, vestibular, cochlear, snail and internal auditory canal could be displayed. As the pitch value increases, the image quality decreases (Ρ <0. 01). The edge algorithm has better image quality than the standard algorithm and the bone algorithm. The smaller the reconstruction interval, the better the image quality. However, it is not necessary to overemphasize the too thin reconstruction interval. Conclusions The optimal imaging parameters of three-dimensional reconstruction of the internal ear bleb are: 1.0 mm in thickness, 1.0 in pitch and 4.8 cm in visual field. The reconstruction of the edge algorithm is performed with reconstruction interval of 0.2 mm.