Fig. 1

The 320-row upright CT scanner . (Prototype TSX-401R; Canon Medical Systems, Otawara, Japan). During CT scan, the patient’s back was partly touched by the pole for patient safety
The 320-row upright CT scanner . (Prototype TSX-401R; Canon Medical Systems, Otawara, Japan). During CT scan, the patient’s back was partly touched by the pole for patient safety