X-ray computerized tomography apparatus.

摘要

In a helical scanning X-ray CT apparatus, views at an m-th slice position are obtained by interpolating 360 DEG views in a range next to the slice position in a forward direction in which the slice position number increases and 360 DEG views in a range next to the slice position in the backward direction, and m-th tomographic image is reconstructed based on the interpolated views at the m-th slice position. An m-th backward image (mBI) is reconstructed based on the 360 DEG views in the range next to the m-th slice position in the backward direction without interpolation and an m-th forward image (mFI) is reconstructed based on the 360 DEG views in the range next to the m-th slice position in the forward direction without interpolation. An (m+1)BI is obtained by BP [CONV (a - b)] on the mBI and (m+1)FI is obtained by BP [CONV (c - a)] on the mFI. Here, BP: back projection, CONV: convolution, a: a view at the m-th slice position, b: a view which is separated from "a" by 360 DEG , and c: a view which is separated from "a" by 360 DEG . An (m+1)th image is obtained as follows: (m+1)I = mI + DW x {(m+1)FI - (m+1)BI} where DW is an inclination of the coefficients of the interpolation (primary interpolation).