1. A method for detecting at least one defect within a test object, the method comprising the steps: (a) determining a plurality of measurement data sets by insonating an ultrasound signal into the test object respectively at various measurement points such that at a first measurement point of the various measurement points a first insonation angle for a first measurement data set of the plurality of measurement data sets is different from a second insonation angle at the first measurement point for a second measurement data set of the measurement data sets, (b) carrying out a Synthetic Aperture Focusing Technique (SAFT) evaluation for each measurement data set, wherein the evaluation is determined by using a common reconstruction grid within the test object for calculating the SAFT evaluation result for each measurement data set; (c) superposing the calculated SAFT evaluation results, in order to calculate an orientation-independent defect display value for each reconstruction point of the reconstruction grid; and (d) detecting the at least one defect within the test object based on the calculated orientation-independent defect display value.