Scanning systems
First Claim
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1. A scanning method for scanning an object moving in a first direction comprising:
- irradiating the object with radiation;
providing a first detector region and a second detector region wherein the second detector region is arranged to receive radiation that has passed through the first detector region, and wherein at least one of said first or second detector regions comprise a plurality of detector arrays comprising a plurality of groups of detection elements such that the detection elements in a leading detector array are offset along a length of the array by a predefined distance from detection elements in a trailing detector array in said detector region;
detecting the radiation after it has interacted with the object in order to provide information relating to the object;
wherein detecting the radiation comprises capturing a plurality of sets of detection data using different groups of detection elements for providing information relating to a corresponding portion of the object, and wherein each set of detection data is captured at a different time such that each group of detection elements is arranged to provide information on the same portion of the object; and
wherein corresponding portions covered by each group are overlapped in a second direction having a component normal to the first direction.
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Abstract
The invention provides methods, systems and detector arrangements for scanning an object moving in a first direction that includes the steps of irradiating the object with radiation having a peak energy of at least 900 keV, providing a first detector region having a thickness of at least 2 mm and a second detector region having a thickness of at least 5 mm where the second detector region is arranged to receive radiation that has passed through the first detector region, and detecting the radiation after it has interacted with or passed through the object in order to provide information relating to the object.
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Citations
19 Claims
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1. A scanning method for scanning an object moving in a first direction comprising:
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irradiating the object with radiation; providing a first detector region and a second detector region wherein the second detector region is arranged to receive radiation that has passed through the first detector region, and wherein at least one of said first or second detector regions comprise a plurality of detector arrays comprising a plurality of groups of detection elements such that the detection elements in a leading detector array are offset along a length of the array by a predefined distance from detection elements in a trailing detector array in said detector region; detecting the radiation after it has interacted with the object in order to provide information relating to the object; wherein detecting the radiation comprises capturing a plurality of sets of detection data using different groups of detection elements for providing information relating to a corresponding portion of the object, and wherein each set of detection data is captured at a different time such that each group of detection elements is arranged to provide information on the same portion of the object; and wherein corresponding portions covered by each group are overlapped in a second direction having a component normal to the first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A scanning system comprising:
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a radiation source arranged to irradiate an object to be scanned, wherein radiation is emitted from the radiation source in a first direction; a leading detector array, comprising detector elements, arranged to receive radiation after it has interacted with the object; a trailing detector array, comprising detector elements, arranged to receive radiation after it has passed through the leading detector array; wherein the detector elements in the leading detector array are offset along a length of the leading array by a predefined distance from the detector elements in the trailing detector array; wherein each detector element is arranged to capture detection data relating to a corresponding portion of the object and each group of detector elements is arranged to capture a set of detection data at a different time such that each set of detection data covers the same portion of the object; and wherein at least two of the sets of portions are overlapped in a second direction having a component normal to the first direction. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification