A method for the non-destructive testing of a test body, in particular of a rotationally symmetric test body, by means of ultrasound using a phased array test probe with a control and processing unit, comprising the following steps: a) placing the phased array on the test body in a first angular position, wherein the angular position corresponds to a rotation position of a reference point in a circumferential direction of the test body, so that a plurality of insonification directions of the phased array is directed into the test body; b) operating the phased array with the control and processing unit, so that a plurality of corresponding A-images is recorded and stored from a backscattered signal for the plurality of insonification directions; c) generating and storing a B-image from the plurality of A-images per angular position; d) placing the phased array along a circumferential direction in a new angular position; e) repeating the steps b, c, d until the new angular position substantially corresponds to a full rotation of the test body; characterized in that it comprises the following steps: f) generating a median B-image from the generated B-images; g) generating difference images by the absolute value of a difference between the B-image and the median B-image being generated for each B-image; h) determining a maximum value of the reflected signal in each difference image for each insonification direction by a maximum value generation being carried out, in each difference image, depending on the insonification direction in an expected region of the sound path, and plotting the determined maximum values into a first C-image, represented by angle-related data series; i) calculating the mean of the first C-image over all angles resulting from the corresponding angular positions and storing the mean first C-image as an angle-related data series; j) subtraction of the data series obtained from the mean calculation from each angle-related data series, absolute-value generation, and plotting the obtained data series into a geometry-corrected second C-image. a) placing the phased array on the test body in a first angular position, wherein the angular position corresponds to a rotation position of a reference point in a circumferential direction of the test body, so that a plurality of insonification directions of the phased array is directed into the test body; b) operating the phased array with the control and processing unit, so that a plurality of corresponding A-images is recorded and stored from a backscattered signal for the plurality of insonification directions; c) generating and storing a B-image from the plurality of A-images per angular position; d) placing the phased array along a circumferential direction in a new angular position; e) repeating the steps b, c, d until the new angular position substantially corresponds to a full rotation of the test body; characterized in that it comprises the following steps: f) generating a median B-image from the generated B-images; g) generating difference images by the absolute value of a difference between the B-image and the median B-image being generated for each B-image; h) determining a maximum value of the reflected signal in each difference image for each insonification direction by a maximum value generation being carried out, in each difference image, depending on the insonification direction in an expected region of the sound path, and plotting the determined maximum values into a first C-image, represented by angle-related data series; i) calculating the mean of the first C-image over all angles resulting from the corresponding angular positions and storing the mean first C-image as an angle-related data series; j) subtraction of the data series obtained from the mean calculation from each angle-related data series, absolute-value generation, and plotting the obtained data series into a geometry-corrected second C-image.