DYNAMIC DISPLAY OF THE TEMPOROMANDIBULAR-JOINT MENISCUS BY USING FAST-SCAN MR IMAGING
DYNAMIC DISPLAY OF THE TEMPOROMANDIBULAR-JOINT MENISCUS BY USING FAST-SCAN MR IMAGING
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DOI：
10.2214/ajr.149.5.959
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发表时间：
1987-11-01
影响因子：
5
通讯作者：
READ, J
中科院分区：
文献类型：
--
作者：
BURNETT, KR;DAVIS, CL;READ, J
为了将颞下颌关节（TMJ）图像显示为动态或运动研究，开发了一种方案，通过使用GE Signa MR扫描仪的“快速扫描”功能在多个开放阶段获得TMJ的MR图像。为了促进该手术，还开发了一种原型装置，以用户定义的增量（最小1 mm）被动地将患者的嘴从静止（闭合）打开到完全打开。使用GE Signa系统在1.5 T下运行的GRASS脉冲序列数据库，在每个连续站点进行MR成像（表面线圈）。在尸体和志愿者的研究中优化了图像采集参数，以获得最清晰的TMJ半月板轮廓，并确定每个切片的总成像时间（图像质量）、患者耐受性和其他实际考虑因素之间的任何潜在权衡。为了进行查看，将图像顺序放置在操作控制台的视频存储器中，并以可变（操作员可选择）速度以前后闭合电影循环或“电影”模式显示。在四个人的动态序列进行了比较，静态开放和闭合口的意见与常规脉冲序列。由于脉冲序列数据库的技术限制，动态显示的任何单个图像都缺乏常规静态图像的高分辨率。然而，在电影模式下，相关的关节结构（如半月板和髁）被清楚地描绘出来，因为是几个重要的咀嚼肌。下颌张开时半月板的前向运动（平移）特别明显，提示功能评估的巨大潜力。这些结果表明，动态TMJ成像与MR的可行性。电影显示的附加信息可能补充常规静态图像，并可能被证明是非常有价值的TMJ功能障碍的评估。
In order to display temporomandibular joint (TMJ) images as a dynamic or motion study, a protocol was developed to obtain MR images of the TMJ in multiple phases of opening by using the "fast-scanning" capabilities of the GE Signa MR scanner. To facilitate this procedure a prototype device was also developed to passively open the patient''s mouth from resting (closed) to fully open in user-defined increments (minimum 1 mm). MR imaging (surface coil) was carried out at each successive station using the GRASS, pulse-sequence data base of the GE Signa system operating at 1.5 T. Image-acquisition parameters were optimized in studies of cadavers and volunteers to obtain the clearest delineation of the TMJ meniscus and to determine any potential tradeoffs between total imaging time per slice (image quality), patient tolerance, and other practical considerations. For viewing, the images were sequentially placed in the video memory of the operating console and displayed in a back-and-forth-closed cine loop or "movie" mode at variable (operator-selectable) speeds. The dynamic sequences in four individuals were compared with static open- and closed-mouth views obtained with routine pulse sequences. Any single image from the dynamic display lacked the high resolution of the routine static images because of technical limitations of the pulse-sequence data base. However, in the movie mode the pertinent joint structures (such as meniscus and condyle) were clearly delineated, as were several of the important muscles of mastication. The anterior motion (translation) of the meniscus during jaw opening is particularly evident and suggests great potential for functional evaluation. These results show the feasibility of dynamic TMJ imaging with MR. The added information of the cine display potentially complements the routine static images and may prove extremely valuable in the assessment of TMJ dysfunction.