“…Then the interpolation ofthe data, which are absent in the unfilled back projection space, is unattainable. In this case, some kind of a priori knowledge or structural constraints is required to restriet the permissible solutions [1][2][3][4]. The classical regularization procedure, also known as Tichonov-Miller regularization [5][6][7], can be applied for the stated problern as used in some CT app1ications, e.g.…”