Scanning systems
First Claim
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1. A scanning method for scanning an object comprising:
- 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 wherein the second detector region is arranged to receive radiation that has passed through the first detector region;
irradiating the object with a first high energy radiation profile;
detecting the first high energy profile radiation after it has interacted with or passed through the object in order to provide information relating to the object, wherein detecting the first high energy profile radiation comprises;
detecting the first high energy profile radiation at the first detector region;
receiving the first high energy profile radiation that has passed through the first detector region at the second detector region;
detecting the first high energy profile radiation at the second detector region;
irradiating the object with a second low energy radiation profiledetecting the second low energy profile radiation after it has interacted with or passed through the object in order to provide information relating to the object, wherein detecting the second low energy profile radiation comprises;
detecting the second low energy profile radiation at the first detector region;
receiving the second low energy profile radiation that has passed through the first detector region at the second detector region;
detecting the second low energy profile radiation at the second detector region;
wherein the first detector region is positioned between the object and the second detector region; and
calculating a ratio, (A/B)1/(A/B)2 in order to determine information relating to the object based upon said ratio, wherein A is indicative of an amount of radiation detected at the first detector region, B is indicative of an amount of radiation detected at the second detector region, (A/B)1 is a ratio of the first high energy profile radiation detected at the first detector region relative to first high energy profile radiation detected at the second detector region, and (A/B)2 is a ratio of the second low energy profile radiation detected at the first detector region relative to second low energy profile radiation detected at the second detector region.
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Abstract
The present application discloses methods and systems for scanning an object. The scanning system provides 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. The second detector region is arranged to receive radiation that has passed through the first detector region. The method includes irradiating the object with radiation having having a peak energy of at least 1 MeV, and detecting the first profile radiation after it has interacted with or passed through the object in order to provide information relating to the object.
532 Citations
17 Claims
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1. A scanning method for scanning an object comprising:
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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 wherein the second detector region is arranged to receive radiation that has passed through the first detector region; irradiating the object with a first high energy radiation profile; detecting the first high energy profile radiation after it has interacted with or passed through the object in order to provide information relating to the object, wherein detecting the first high energy profile radiation comprises; detecting the first high energy profile radiation at the first detector region; receiving the first high energy profile radiation that has passed through the first detector region at the second detector region; detecting the first high energy profile radiation at the second detector region; irradiating the object with a second low energy radiation profile detecting the second low energy profile radiation after it has interacted with or passed through the object in order to provide information relating to the object, wherein detecting the second low energy profile radiation comprises; detecting the second low energy profile radiation at the first detector region; receiving the second low energy profile radiation that has passed through the first detector region at the second detector region; detecting the second low energy profile radiation at the second detector region; wherein the first detector region is positioned between the object and the second detector region; and calculating a ratio, (A/B)1/(A/B)2 in order to determine information relating to the object based upon said ratio, wherein A is indicative of an amount of radiation detected at the first detector region, B is indicative of an amount of radiation detected at the second detector region, (A/B)1 is a ratio of the first high energy profile radiation detected at the first detector region relative to first high energy profile radiation detected at the second detector region, and (A/B)2 is a ratio of the second low energy profile radiation detected at the first detector region relative to second low energy profile radiation detected at the second detector region. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10)
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5. The method of claim comprising sending detected information received in response to a burst from the detector regions before a next burst occurs.
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11. A scanning system for scanning an object comprising:
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a variable energy level radiation source arranged to irradiate an object with radiation having a plurality of different energy profiles including a first high energy profile having a peak energy ranging from 1 MeV to 6 MeV and a second low energy profile having a peak energy ranging from 0.5 MeV to 3 MeV; and a detector arrangement arranged to detect radiation after it has interacted with the object, wherein the detector arrangement comprises a first detector region having a thickness of at least 2 mm and arranged to detect radiation and a second detector region having a thickness of at least 5 mm and arranged to detect radiation wherein the first detector region is positioned between the object and the second detector region, further comprising a controller wherein the controller is arranged to calculate a ratio, (A/B)1/(A/B)2 in order to determine information relating to the object based upon the calculated ratio, wherein A is indicative of an amount of radiation detected at the first detector region, B is indicative of an amount of radiation detected at the second detector region, (A/B)1 is a ratio of a first profile radiation detected at the first detector region relative to first profile radiation detected at the second detector region, and (A/B)2 is a ratio of a second profile radiation detected at the first detector region relative to second profile radiation detected at the second detector region. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification