A method for applying correction adapted to the shape of a subject to be imaged. The method includes applying edge enhancement to data D(r, v, c) of interest if the difference between the data D(r, v, c) of interest and data D(r, v+1, c) in a view adjacent to the view corresponding to the data D(r, v, c) is large, while smoothing is applied to the data D(r, v, c) of interest when the difference is small.