Scanning systems
First Claim
Patent Images
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 radiation having a peak energy of at least 1 MeV;
detecting the first 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 profile radiation comprises;
detecting the first profile radiation at the first detector region;
receiving the first profile radiation that has passed through the first detector region at the second detector region;
detecting the first profile radiation at the second detector region;
the scanning method further comprising;
irradiating the object with radiation having a second energy profile, relatively lower than the first energy profile, and having a peak energy of at least 0.5 MeV;
detecting the second 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 profile radiation comprises;
detecting the second profile radiation at the first detector region;
receiving the second profile radiation that has passed through the first detector region at the second detector region; and
detecting the second profile radiation 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 a peak energy of a 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.
164 Citations
23 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 radiation having a peak energy of at least 1 MeV; detecting the first 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 profile radiation comprises; detecting the first profile radiation at the first detector region; receiving the first profile radiation that has passed through the first detector region at the second detector region; detecting the first profile radiation at the second detector region; the scanning method further comprising; irradiating the object with radiation having a second energy profile, relatively lower than the first energy profile, and having a peak energy of at least 0.5 MeV; detecting the second 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 profile radiation comprises; detecting the second profile radiation at the first detector region; receiving the second profile radiation that has passed through the first detector region at the second detector region; and detecting the second profile radiation at the second detector region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A scanning system for scanning an object comprising:
- a variable energy level radiation source arranged to irradiate an object with radiation having a plurality of different energy profiles including a first energy profile having a peak energy of at least 1 MeV and a second relatively lower energy profile having a peak energy of at least 0.5 MeV, a detector arrangement arranged to detect radiation after it has interacted with or passed through 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 second detector region is arranged to receive radiation that has passed through the first detector region and further comprising a controller, wherein the controller is arranged to calculate the ratio, (A/B)1/(A/B)2 in order to the determine information relating to the object based upon the calculated ratio, wherein (A/B)1 is the ratio of 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 the ratio of second profile radiation detected at the first detector region relative to second profile radiation detected at the second detector region.
- View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
Specification