FIELD: X-ray tomography. SUBSTANCE: X-ray calculation tomograph incorporates facilities to generate double- differentiated projection data formed by collimator 9 installed in X-ray radiation source 1 having shaped collimation hole 19, which cross-section shape has two mutually perpendicular symmetry axes with unequal dimensions of beam along each symmetry axis and in direction perpendicular to it, rotation facilities 9-11 of collimator with fixed rotational speed about axis perpendicular to plane of cross-section of collimator and passing through crossing point of its symmetry axes and detector 2 with filter 13 tuned to extraction of component of signal on double rotational speed of collimator placed into circuit 12-15 of preliminary processing of signal. EFFECT: increased functional stability of tomograph. 5 dwg
