The Development of temporomandibular joint radiography using multipurpose rotational panoramic radiography

本研究的目的是建立一种方法，通过多用途旋转全景x线摄影清晰地投射颞下颌关节，获得高价值的诊断x线图像。从一项关于旋转全景x线摄影中颞下颌关节图像层位置和x线方向的研究来看，为了获得最大的信息，TMJ旋转全景x线摄影至少需要两个投影（侧位和斜位）。说明了这两种投影的特点。（SUGAWARA）1) TMJ斜向全景投影a)投影方向从成像理论的角度来看，旋转全景x线摄影很难获得闭口位时髁头的正面视图。侧位全景x线摄影显示，下颌髁头从中下前方向略微张开的位置投影。（UEMURA， TAKEUCHI） b)图像层为了获得更清晰的髁突图像，我们改变了图像层厚度。因此，在图像层厚度9mm处，可以看到最优秀的髁突头结节状图案。（KAWAGUCHI）2)闭口位TMJ外侧全景投影（尽可能与长轴平行投影）a) TMJ外侧投影标准模式在闭口位时，仅60%的病例能识别颞骨轮廓。这个投影的位置和方向似乎是错误的。（KUDOH 1） b)通过改变图像层厚度和位置来改善图像改变图像层厚度和位置，检查髁突和颞骨的轮廓。仅在图像层厚度为6mm，且定位外侧5mm时，才难以发现盂后棘。(KUDOH 2号)。针对髁突与图像层的位置，研究了利用髁突与耳杆宽度的关系定位髁突头的方法。少

The purpose of this study was to establish a method to obtain high valued diagnostic x-ray images by projecting the temporomandibular joint clearly using multipurpose rotational panoramic radiography.From a study concerning the position of an image layer and the direction of x-rays to the temporomandibular joints in rotational panoramic radiography, to obtain maximum information using TMJ rotational panoramic radiography, at least two projections (lateral and oblique) were necessary. The characteristics of these two projections were shown. (SUGAWARA)1) Oblique panoramic TMJ projection a) direction of projection From the standpoint of image formation theory by rotational panoramic radiography, it is difficult to obtain a frontal view of the condylar head at a closed mouth position. A lateral panoramic radiography in which the mandibular condylar heads are projected from the mesio-inferior anterior direction at a slightly open mouth position was excellent. (UEMURA, TAKEUCHI) b) image lay … More er To obtain a clearer image of the condyle, we changed the image layer thickness. As a result, at 9mm thickness of the image layer the most excellent turabecular pattern of condylar head can be seen. (KAWAGUCHI)2) Lateral panoramic TMJ projection at a closed mouth position (projection to long axis as parallel as possible) a) standard mode of lateral projection of TMJ At closed position contour of temporal bone could be recognized in only 60% of the cases. Position and direction of this projection seemed to be wrong. (KUDOH 1st) b) improvement of the image by changing the image layer thickness and position Changing the thickness and position of the image layer, the contour of the condyle and temporal bone were examined. Only at an image layer thickness of 6mm, and positioned 5mm laterally, the postglenoid spine was difficult to detect. (KUDOH 2nd). Concerning the position a condyle to image layer), a method for positioning the condylar head using the relationship between width of condylar heads and ear rods was studied. Less