-IMAGE *image_reconst (IMAGE *im, RAYSUM *rs, int filt_type, double filt_param, const InterpolationType interp_type, int interp_param, const BackprojType backproj_type, int const ir_trace);
+IMAGE *image_reconst (IMAGE *im, RAYSUM *rs, const FilterType filt_type, double filt_param, InterpolationType interp_type, int interp_param, const BackprojType backproj_type, int const ir_trace);