Fig. 1

Upright computed tomography (CT) scanner and the acquired images. A A 320-row upright CT scanner (prototype TSX-401R; Canon Medical Systems, Otawara, Japan) was used to acquire images from the hip joint to the end of the foot in the standing position. The approximate acquisition time was 10–20 s. B Acquired images of knee osteoarthritis (OA) with an upright CT scanner. The image qualities of the upright CT scanner range from good to excellent [11]