AUTOMATIC MATERIAL DISCRIMINATION BY USING COMPUTER TOMOGRAPHY

摘要

In conventional material discrimination, for example in baggage inspection, the attenuation coefficient of an item of baggage is used to identify the material in the baggage. However, the result can be ambiguous since there are often dangerous and non-dangerous materials having the same attenuation coefficient. According to the present invention, a method and apparatus are provided combining the information obtained from CT and Coherent Scatter Computed Tomography to better determine whether there are dangerous materials in the baggage or not. Hence, according to the present invention the attenuation coefficient and the diffraction pattern of the item of baggage are used to determine whether the baggage can be cleared or not.