Abstract
An experimental study was carried out to obtain the adequate CT picture by using a cadaver vertebra. EMI, CT 5005 scanner was used. Best condition to observe the thoracic canal by CT was nearly 400 EMI units in window width and 150 in level. Scanning angle was permited within about 10° in configulation and dimention.Configulation of 10 normal thoracic canals at each vertebral level was assessed and the dimentions of the canal at these levels were measured.In the cases of developmental cervical canal stenosis, the thoracic canal showed narrow especially in sagittal diameter. On the other hand it did not show marked difference in transverse diameter.In 4 cases of ossification of the yellow ligament treated surgically, 3 cases showed narrow thoracic canal on CT scan and narrow cervical canal in conventional radiographs.
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