It is difficult to take frontal or lateral views of the lower cervical and upper thoracic vertebrae, even in normal individuals, because of the overlapping images of scapula, clavicle, humerus, ribs, etc. It is extremely difficult in those whose upper limbs are paralysed. So the authors examined various methods : 1) lateral view of the cervical vertebrae. 2) low r cervical vertebrae. 3) orthogonal tomography (in this method the tube is moved in an orthogonal direction against the axis of the body). In addition, he studied the relation between the voltage and images in high voltage radiography.
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