Direct coronal computed tomography of the upper cervical spine.

Abstract

The technique of obtaining direct coronal computed tomography images of the upper cervical spine is described. To show the usefulness of this technique in demonstrating upper cervical spine lesions and to show that orbital (lens) radiation dosage is minimal compared with conventional tomography. Conventional tomography is used routinely for assessment of the odontoid peg and upper cervical spine lesions. Direct coronal computed tomography for imaging the cervical spine has not been previously described. Using a removable head support device, direct coronal images are obtained using a computed tomography scanner. The gantry tilt is adjusted from the scanogram. Direct comparison of orbital radiation dosages between computed tomography and conventional tomography is made from placement of thermoluminescent dosemeter chips onto a phantom. Direct coronal computed tomography provide superior demonstration of skeletal features in the upper cervical spine. Orbital radiation dose is negligible compared with conventional tomography. This technique may replace conventional tomography in assessing of stable upper cervical spine lesions.