Comparison of the Sample Clauses

Comparison of the processing methods and parameters Since the reference and the quantified methods are applied on the same dataset, which was acquired using the same set-up and hardware, it’s possible to measure the improvement of the newly proposed imaging techniques. Following parameters can be distinguished for the assessment of imaging algorithm performance: detectability of the defect, inspection depth, signal to noise ratio (SNR) or contrast to noise ratio (CNR), ligament, height and tilt angle. The quantification parameters depend on the type of the defect that has been investigated. The most important parameter is the detectability of the defect, which identifies if the defect can be detected in general. It’s a binary parameter, identifying whether the particular defect is visible in the reconstruction. The inspection depth defines the maximum depth at which the defect can be clearly observed. In the ideal case, the inspection depth is equal to the thickness of the sample. The quality of ultrasonic imaging is defined by the fact how clearly the reflections of defects under investigation appear above the background noise. This can be expressed in terms of SNR or CNR. However, many different approaches to obtain SNR/CNR values exist, which sometimes lead to inconsistent and contradicting results. A special study has been prepared on SNR/CNR evaluation approaches and their performance in different scenarios, which is presented in Annex 3. Ligament defines the depth of the defect with respect to the inspection surface and is applied to SDH and FBH. The notch type defects have two additional parameters namely height and tilt angle (for tilted notches). Parameters for comparison of the imaging methods are presented in Table 6.11. Table 6.11: Parameters for comparison of the imaging methods Unique sample identifier Unique set-up no. Processed data file (image) Reference imaging method performance Quantified imaging method performance Detectability Inspection depth SNR/CNR Ligament Detectability Inspection depth SNR/CNR Ligament 1618-B359-B1 #01 #02 #03 #04 #05 #06 #ID Table 6.11: Parameters for comparison of the imaging methods (continued) D522-TG Unique set-up no. Processed data file (image) Reference imaging method performance Quantified imaging method performance Detectability Inspection depth SNR/CNR Ligament Detectability Inspection depth SNR/CNR Ligament #07 #08 #09 #10 #11 #12 #ID 1517-T105EE-2G Unique set-up no. Processed data file (image) Reference imaging method ...