Backscatter shields and methods of shielding
A DR detector having a layer of imaging pixels and one or more shield layers behind the layer of imaging pixels. A first shield layer may have a thickness selected to be between about 1 mil and about 5 mils of a material selected from lead, tungsten, tin, copper, aluminum, and magnesium, selected according to an energy magnitude of radiographic energy received by the detector. A second shield layer may be positioned behind the first shield layer. The second shield layer may have a similar or different thickness selected according to an energy magnitude of radiographic energy received by the detector. The first shield layer may be positioned directly behind the layer of imaging pixels and the second shield layer may be positioned at an interior surface of the back of the detector housing.
1. A DR detector comprising:
a layer of imaging pixels;
a first shield layer behind the layer of imaging pixels, relative to an x-ray source, the first shield layer having a thickness selected according to an energy magnitude of x-ray radiation to be received by the detector to minimize scattered x-ray radiation therewithin;
a second shield layer behind the first shield layer; and
a third shield layer between the first shield layer and the second shield layer,
wherein the third shield layer comprises copper and tin formed as distinct abutting sublayers.
2. The detector of claim 1 , wherein the first shield layer comprises a thickness of between about 1 mil and about 5 mils.
3. The detector of claim 2 , wherein the second shield layer comprises a thickness of between about 1 mil and about 5 mils.
4. The detector of claim 3 , wherein the first shield layer comprises any two or more of the following, in the order listed:
lead, tungsten, tin, copper, aluminum, and magnesium.
5. The detector of claim 4 , wherein the second shield layer comprises any two or more of the following, in the order listed:
lead, tungsten, tin, copper, aluminum, and magnesium.
6. The detector of claim 3 , wherein the second shield layer comprises any two or more of the following, in the order listed:
lead, tungsten, tin, copper, aluminum, and magnesium.
7. The detector of claim 2 , wherein the first shield layer is selected from the group consisting of lead, tungsten, tin, copper, aluminum, and magnesium.
8. The detector of claim 1 , wherein the second shield layer comprises a thickness of between about 1 mil and about 5 mils.
9. The detector of claim 8 , wherein the second shield layer is selected from the group consisting of lead, tungsten, tin, copper, aluminum, and magnesium.
10. The detector of claim 1 , wherein the second shield layer is positioned behind electronic readout circuitry of the detector.
11. The detector of claim 1 , wherein the second shield layer is positioned against a back surface of an interior of a housing of the detector.
12. The detector of claim 1 , wherein the copper sublayer comprises a thickness between about 50 and 150 μm, and wherein the tin sublayer comprises a thickness between about 225 μm and about 375 μm.
13. The detector of claim 12 , wherein the copper sublayer comprises a thickness more preferably about 100 μm, and wherein the tin sublayer comprises a thickness more preferably about 300 μm.
14. The detector of claim 1 , wherein the first shield layer comprises any two or more of the following, in the order listed:
lead, tungsten, tin, copper, aluminum, and magnesium.
15. The detector of claim 14 , wherein the second shield layer comprises any two or more of the following, in the order listed:
lead, tungsten, tin, copper, aluminum, and magnesium.
16. The detector of claim 15 , wherein the first shield layer and the second shield layer each comprise a thickness between about 1 mil and about 5 mils.
17. The detector of claim 1 , wherein the second shield layer comprises any two or more of the following, in the order listed:
lead, tungsten, tin, copper, aluminum, and magnesium.
18. A DR detector comprising:
a layer of imaging pixels;
a first shield layer behind the layer of imaging pixels, relative to an x-ray source, the first shield layer having a thickness selected according to an energy magnitude of x-ray radiation to be received by the detector to minimize scattered x-ray radiation therewithin;
a second shield layer behind the first shield layer; and
a third shield layer between the first shield layer and the second shield layer
wherein the third shield layer comprises copper and tin formed as an alloy.
19. A DR detector comprising:
a layer of imaging pixels;
a first shield layer behind the layer of imaging pixels, relative to an x-ray source, the first shield layer having a thickness selected according to an energy magnitude of x-ray radiation to be received by the detector to minimize scattered x-ray radiation therewithin;
a second shield layer behind the first shield layer; and
a third shield layer comprising copper and tin.