System and method for CT scanning of baggage
First Claim
Patent Images
1. A method for determining a position of a first object in a package of multiple objects, the method comprising:
- processing a CT scan of the package to produce a lineogram;
determining clutter indexes for slices in the lineogram, wherein each slice corresponds to a single horizontal position in the package and a single projection angle;
selecting a clutter index from the clutter indexes and a corresponding horizontal position; and
outputting an indicia of the position of the first object in the package.
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Abstract
The threat determination process for CT scan of baggage eliminates the need for complete reconstruction the bag. The CT scan data is analyzed during scanning to locate potential threats. The analysis is based upon a lineogram representing objects in the bag. The mass, size, location and atomic number of objects are determined based upon the lineogram data. Any potential threats are further subjected to data modification and reconstruction to enhance the view of the potential threat. Dual energy scanning may also be used to determine density for resolution of potential threats.
74 Citations
14 Claims
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1. A method for determining a position of a first object in a package of multiple objects, the method comprising:
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processing a CT scan of the package to produce a lineogram; determining clutter indexes for slices in the lineogram, wherein each slice corresponds to a single horizontal position in the package and a single projection angle; selecting a clutter index from the clutter indexes and a corresponding horizontal position; and outputting an indicia of the position of the first object in the package. - View Dependent Claims (2, 3)
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4. A method for scanning a bag to locate potential threats comprising the steps of:
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performing a CT scan of the bag; calculating a lineogram from the CT scan of the bag; determining a clutter index for positions in the lineogram; selecting positions in the lineogram wherein the clutter index is less than a threshold value; determining a characteristic of objects from data at the selected positions; determining whether a threat exists based upon the characteristics of the objects; and outputting an indicia of the existence of a threat. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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12. A system for locating threats in bags comprising:
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a CT scanner having a rotating gantry; a conveyor for advancing bags through the CT scanner during rotation of the gantry; means for creating a lineogram of data from the CT scanner; means for determining a clutter index for positions in the lineogram; means for selecting a clutter index with a value that is less than a threshold value; means for determining at least one characteristic of objects in a bag based upon data at the positions; and means for determining threats based upon the at least one characteristic. - View Dependent Claims (13, 14)
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Specification