REGION-OF-INTEREST (ROI) MODE IN INDUSTRIAL X-RAY COMPUTED-TOMOGRAPHY

In contrast to medical CT where ROI-methods have been discussed from the point of view of lowering the radiation burden of the patient, industrial CT can profit from ROI-methods with respect to shorter measuring and computing time. Three methods of ROI-image reconstruction are discussed, all based on the assumption of having gained the out-of-ROI data of each profile with poor resolution and precision. The experiments show that for the ROI-image no deterioration is caused by reduced data sets for the out-of-ROI range, either for coarse sampled data or lower dynamic range of the detector.