维普资讯 http://www.cqvip.com ・276・ 实用医学影像杂志2007年第8卷第5期 JPMI,2007,Vo1.8,No.5 3—5. 基础有重要的临床意义,为LA的演变提供了一种 可行的观察方法。随着影像学技术的提高和相应软 件的不断改进,对LA的研究将有重要的临床意义 及广泛的应用前景。 参考文献 【l】Hachinski VC,Potter P,Merskey H.Leuko—araiosis【J】.Arch Neuwl,1987.44(1):2l一23. 【5】 Sener RN.Difusion MR finding in Wilson s disease[J].Comput Med Imaging Graph,2003,27(1):17—21. lchi M,Moretti M,Della Nave R,et a1.Longitudinal evalu— 【6】 Mascaation of Leukoaraiosis with whole brain ADC histograms[J].Neu— elrogy,2002,59(6):938—940. 【7】 Huppi PS,Murphy B,Maier SE,et a1.Micrestructurl braain dev— elopment after perinatal cerebrl whiate matter injury assessed by difusion tensor magnetic resonance imaging[J】.Pediatrics,2001, l07(3):455—460. e GJ.Proton magetic resonance spectroscopy in pediatric neu—- 【8】 Moor【2】秦绍森,玛依努尔,盛爱珍.脑白质疏松症影像及临床研究【J】. 中国医学影像技术,2000,16(3):198—200. 【3】 Chimowitz MI,Estes ML,Fudan AJ,et a1.Further observations on the pathology of subeortical lesions identiied on magnetfic reso— erradiology【J】.Pediatr Radiol,2002,225(2):245—252. 【9】 Prost P,Haughion V,Li ST.Brain humans:localized H MR spec— nanee imaging[J].Arch Neurel,1992,49(7):747—752. troscopy at 0.5 TIJ】.Radiology,1990,176(2):509—511. 【4】郭.脑白质疏松症【J】.临床神经病学杂志,2002,15(1): 螺旋CT三维重建在上颌骨正畸埋伏牙诊断中的临床应用 林聪 ,邹亚楠 ,王旭霞 ,张君 (1.胜利油田中心医院口腔正畸科,山东东营 257034;2.山东大学口腔医学院正畸科) 【摘要】 目的评价cT三维重建在上颌骨正畸埋伏牙中的诊断价值。方法对常规13腔全景片和咬合片不能清楚判断的 47例上颌骨内埋伏牙患者行螺旋CT扫描和图像三维重建,并采用多平面重建(MPR)、三维牙体表面成像(SSD)及上颌骨和牙体容 积成像(VR)显示埋伏牙的形态、位置及与邻牙的关系。结果 47例均清楚显示了埋伏牙的形态、唇腭向位置、萌出方向及与邻牙 的关系,MPR可测出埋伏牙的高度,SSD能清晰地显示骨内埋伏牙的形态、在牙列唇侧或腭侧的位置及与牙列牙根的关系,VR可 展现埋伏牙的萌出方向及与邻牙的空间关系。结论 SSD和VR成像对上颌骨埋伏牙可互为补充,立体直观地、完整地显示其病理 解剖关系,是一种准确有效的检查方法。 【关键词】颌骨;多生牙;体层摄影术,X线计算机 【中图分类号】R8l4.42;R783 【文献标识码】 A 【文章编号】1009—6817(2007)05—0276—03 Assessment of spiral CT and 3一dimensional image in diagnosis of maxillary pseudoanodofia L/n Cong,Zhou Yanan,Wang Xuxia, Zhang Jum Department of Orthodontics,the Shengli Oil—field Central Hospital,Dongying 257034,China 【Abstract】0biective To assess the diagnostic value of spiral CT and 3一dimensional image in diagnosis of maxillary pseudoanodoti一 Methods Forty—seven patients whose impacted teeth couldn t be judged clearly through the panorama and occlusal with maxillary pseu- doanodotia were scanned with 1 mm collimation,reconstruction interval 1 mm and pitch of 1—3.Oriinalg data obtained with transaxial images were transferred to workstation and postprocessed with muhiplane rec0nstructi0n(MPR),surface shading display(SSD)and volumetirc rendering (VR).Results Three—dimensional surface reconstruction of spiral CT could clearly demonstatre the dental surface image including crown,root bifurcation in three—dimensional way,labial or palatal lcatoion,eruption orientation and relation with dentition.MPR image can present the pseudoanodotia highness.SSD image could reveal the dental surface image including crown,root,neck and root bifurcation in three—dimen— sional way,and the abnormal configuration,labil ora palatal location,and relation with dentition in anterior maxilla,without presenting the im— age of other tissue around.VR could display the shape,location,eruption orientation,the angle of orthodontic distraction and the connection with around teeth.Conclusion 3D images with SSD and VR present a direct visualization of maxillary pseudoanodotia.Combination of both techniques provides an advantage of showing pathoanatomic relationship of maxillary pseudoanodotia.The three—dimensional surface recon。 stuetrion is an accurate and effective method to examine impactd teeeth before orthodontic treatment. . 【Key words】 Jaw;Supernumerary tooth;Tomography,X—ray computed 基金项目:山东省科学技术发展计划(2006G2202031)和山东省东营 市科技局科学技术发展计划(编号2006—24号) 收稿日期:2007—04—20;修回日期:2007—06一ol 作者简介:林聪(1966一),女,山东省青岛市人,大学本科学历,主 治医师,研究方向:口腔医学。 维普资讯 http://www.cqvip.com 维普资讯 http://www.cqvip.com