Abstract
A medical X-ray CT scanner was used as a non-destructive inspection method for the detection of selectednon-metallic materials embedded in various fluids and food materials. The X-ray absorption characteristics of testedmaterials were expressed as X-ray CT numbers. It was found that the CT number of a foreign object was affected by asystemic error (a point spread function), even if its size was greater than 1 pixel in the video image provided by thescanner. Within the interface region between the foreign object and its surrounding matrix, CT numbers were found tovary smoothly between characteristic values for the object and the matrix thus pointing to important effects to considerwhen developing X-ray CT techniques for the detection and identification of foreign materials in foods. Specific thresholdvalues for CT numbers of selected foodstuffs were defined for successful detection of foreign materials. This study alsopointed out the limitation of using X-ray linear absorption coefficients from typical CT systems to detect certaincombination of foreign materials and foodstuffs.
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