岩骨轴位定标与定点摄影的研究

PROJECTIONAL ORIENTATION OF PETROSAL AXIS IN ROENTGENOGRAPHY

本文对岩骨轴位定标与定点摄影原理及投照方法作了研究,结果表明:通过头颅体表的两个定标点,即乳突尖向上及对侧眼眶向下各1cm,两定标点问的连线即为岩骨在颅内的位置及走向。在岩骨轴位摄影时,将定标点之一的乳突尖上1cm处对准台面定点,并使两定标点的连线垂直于台面定点,中心线通过台面定点向足端斜45°角。本文经85例对象共拍摄了170张岩骨轴位照片,结果投照位置准确率达97.6％

After many years exploration,the auther obtained a new method for taking X-ray films of the petrosomastoid cone of the head. Using this method, 170 films of 85 cases were collected,the rate of accurate projection was 97. 6%, which was obviously superior than results reported by other methods before. A point was fixed at the head end of the X-ray table as the point O, then the central line of the X-ray tube was adjusted so as to perpendicular vertically to this point. The point 1cm above vertically to the apex of the patient's mastoid process was aimed at the point O,then who's head was adjusted until the point 1cm below vertically to the lateral margin of the opposite eye socket was perpendicular vertically to the point O,and maintained at this position. The line which connected these two points on the head was corresponded with the position and trend of the petrosomastoid cone. Then the tube was tilted 45 degrees to the foot end of the table,and the distance between the tube and the point O as well as the position of the film was adjusted, then the film was exposed.