CT was used to measure the cross-sectional area of the trunk muscles. A cushion was placed beneath the knees with subjects in the supine position, and even weight was maintained on both sides. In this position, the lumber 4 upper end plate, where the curvature angle is smallest and precise imaging is possible, was scanned. A CT 5-mm scan
was obtained at a power of 120 kV and 240 mA for 1 second (matrix 512 × 512 pixels). In the cross-sectional area of the muscles, the multifidus, deep muscle, paraspinal muscle,and superficial muscle were measured. Analysis after the
measurement was performed on the regions of interest using a picture archiving and communication system. The
images were enlarged to 152.28% to enhance the visibility of the circumference of each muscle. A drawing was made
along the contour surfaces, avoiding fat, skeletal structure, and other soft tissues. The sum of the cross-sectional areas
of the muscles was then automatically calculated by the computer.
CT was used to measure the cross-sectional area of the trunk muscles. A cushion was placed beneath the knees with subjects in the supine position, and even weight was maintained on both sides. In this position, the lumber 4 upper end plate, where the curvature angle is smallest and precise imaging is possible, was scanned. A CT 5-mm scan
was obtained at a power of 120 kV and 240 mA for 1 second (matrix 512 × 512 pixels). In the cross-sectional area of the muscles, the multifidus, deep muscle, paraspinal muscle,and superficial muscle were measured. Analysis after the
measurement was performed on the regions of interest using a picture archiving and communication system. The
images were enlarged to 152.28% to enhance the visibility of the circumference of each muscle. A drawing was made
along the contour surfaces, avoiding fat, skeletal structure, and other soft tissues. The sum of the cross-sectional areas
of the muscles was then automatically calculated by the computer.
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