An Improved Extrapolation Scheme for Truncated CT Data Using 2D Fourier-Based Helgason-Ludwig Consistency Conditions

Figure 7

Reconstruction results of the reprojected clinical dataset 2 with both medium truncation (a) and severe truncation (c). (b) and (d) show the corresponding difference images with respect to the reference (only computed in the ROI region). From left to right: reference from nontruncated data, proposed correction method, and water cylinder extrapolation (cf. Berger et al. [8]). The grayscale window: = 0 HU, = 2000 HU.