1. A method for detecting at least one defect within a test object, comprising the steps: (a) determining a plurality of measurement data sets (MDS) of the test object comprising: for each measurement data set, isonating an ultrasound signal respectively at various measurement points (MP) into the test object, with a selected insonation angle (α), in order to determine a measurement data set (MDS); selectively varying the insonation angle for each measurement data set (MDS) for the determination of the measurement data sets (MDS); (b) carrying out a SAFT (Synthetic Aperture Focusing Technique) evaluation for each measurement data set (MDS), wherein the evaluation is determined by using a common reconstruction grid (RG) within the test object for calculating an SAFT evaluation result for each measurement data set (MDS); and (c) superposing the calculated SAFT evaluation results, in order to calculate an orientation-independent defect display value (S RP )) for each reconstruction point (RP) of the reconstruction grid (RG).