Development of the cephalometrically videofluorographic system for the temporomandibular joint ; biplane lateral oblique transcranial projection.

研制了一套适合于临床常规使用的TMJ功能影像诊断系统。该系统是为保持受试者的生理位置而设计的，具有合格的图像。使用这里使用的4英寸孔径成像系统，最理想的焦距为900 mm。在这种情况下，在80kVp和2 mA范围内获得了TMJ的荧光照片。因此，可以采用固定阳极X射线管和单相整流器，可以实现小规模的静音环境。三种不同大小的固定准直器可以消除来自X射线管对侧的干扰图像质量的散射射线。左、右TMJ透视的两路视频信号利用数字处理单元进行整合，并在单个监视器上显示。操作者可以同时选择双侧关节或单侧关节的放大图像。该系统应用于30名受试者，包括志愿者和颌骨疾患患者。临床上可以获得具有足够对比度的关节运动图像。利用该系统和数字录音系统，实现了关节运动和关节声音的同步记录和分析。

A diagnostic imaging system for the temporomandibular joint (TMJ) function was developed that was suitable for the routine clinical use. The system was designed for the subject to maintain the physiologic position with qualified image. The most preferred focus-image distance was 900mm with the 4-inch aperture imaging system employed here. In this circumstance, the fluorographic view of the TMJ was obtained within 80kVp and 2mA. Therefore, fixed anode X-ray tubes and single-phase rectifiers could be employed, and we could achieve the silent circumstance with a small scale. The scattered rays which interfere the quality of the image, originating from the opposite side of the x-ray tube, could be eliminated by the fixed collimator of the three different size.Fluorography was recorded into a videotape. Two video signals of the left and right TMJ fluorography were integrated with the use of digital processing unit and displayed in a single monitor. The operator could select either a view of the bilateral joints simultaneously or a enlarged view of the unilateral joint.This system was applied to the 30 subjects including volunteers and patients with cranimandibular disorders. We could obtain a image of the joint movement with enough contrast clinically. Furthermore, the typical movement patterns of the mandibular condyle were observed in the case with clicking noise or limitation of opening mouth.The simultaneous recording and analysis of the joint movement and the joint sound is in progress with this system and digital sound recording system.