Monochromatic X-ray imaging systems and methods
According to some aspects, a carrier configured for use with a broadband x-ray source comprising an electron source and a primary target arranged to receive electrons from the electron source to produce broadband x-ray radiation in response to electrons impinging on the primary target is provided. The carrier comprising a housing configured to be removeably coupled to the broadband x-ray source and configured to accommodate a secondary target capable of producing monochromatic x-ray radiation in response to incident broadband x-ray radiation, the housing comprising a transmissive portion configured to allow broadband x-ray radiation to be transmitted to the secondary target when present, and a blocking portion configured to absorb broadband x-ray radiation.
1. A carrier configured for use with a broadband x-ray source comprising an electron source and a primary target arranged to receive electrons from the electron source to produce broadband x-ray radiation in response to electrons impinging on the primary target, the carrier comprising:
a housing configured to be removeably coupled to the broadband x-ray source and configured to accommodate a secondary target that produces monochromatic x-ray radiation in response to incident broadband x-ray radiation, the housing comprising:
a transmissive portion configured to allow broadband x-ray radiation to be transmitted to the secondary target when present; and
a blocking portion configured to absorb broadband x-ray radiation.
2. The carrier of claim 1 , wherein the transmissive portion comprises at least a first transmissive material substantially transparent to the broadband x-ray radiation emitted by the broadband x-ray source.
3. The carrier of claim 2 , wherein the transmissive portion comprises at least one of aluminum, carbon, carbon fiber, boron, boron nitride, beryllium oxide, silicon and silicon nitride.
4. The carrier of claim 1 , wherein the blocking portion comprising at least a first blocking material substantially opaque to the broadband x-ray radiation emitted by the broadband x-ray source.
5. The carrier of claim 4 , wherein the blocking portion comprises at least one of lead, tungsten, tantalum, rhenium, platinum and gold.
6. The carrier of claim 1 , wherein the transmissive portion comprises a first cylindrical portion configured to accommodate the secondary target and the blocking portion comprises a second cylindrical portion configured to overlap a portion of the secondary target when the first cylindrical portion accommodates the secondary target.
7. The carrier of claim 6 , wherein the secondary target is conical, wherein the first cylindrical portion is configured to accommodate at least a portion of a base of the conical secondary target, and wherein the second cylindrical portion is configured to overlap at least a portion of a tip of the conical secondary target.
8. The carrier of claim 6 , wherein the second cylindrical portion is configured to overlap at least 1 mm of the secondary target when the first cylindrical portion accommodates the secondary target.
9. The carrier of claim 6 , wherein the second cylindrical portion is configured to overlap at least 2 mm of the secondary target when the first cylindrical portion accommodates the secondary target.
10. The carrier of claim 1 , wherein the housing is configured such that, when the secondary target is accommodated within the housing, the secondary target is positioned exclusively within the transmissive portion.
11. The carrier of claim 1 , wherein the transmissive portion comprises a first cylindrical portion to accommodate at least a portion of the secondary target, wherein the first cylindrical portion is positioned on a proximal end of the housing that is configured to be inserted into a receptacle of the broadband x-ray source, and wherein the blocking portion comprises an annular portion positioned on a distal end of the carrier from which monochromatic x-ray radiation is emitted.
12. The carrier of claim 1 , wherein the housing is configured, when coupled to the broadband x-ray source and accommodating the secondary target, to position the secondary target so that at least some broadband x-ray radiation from the primary target impinges on the secondary target via the transmissive portion of the housing.
13. The carrier of claim 12 , wherein when the broadband x-ray source is operated to produce broadband x-ray radiation and the housing is coupled to the broadband x-ray source and is accommodating the secondary target, the carrier is configured to emit monochromatic x-ray radiation having a monochromaticity of greater than 0.8 across a field of view of at least approximately 15 degrees.
14. The carrier of claim 13 , wherein when the broadband x-ray source is operated to produce broadband x-ray radiation and the housing is coupled to the broadband x-ray source and is accommodating the secondary target, the carrier is configured to emit monochromatic x-ray radiation having a monochromaticity of greater than or equal to 0.9 across a field of view of at least approximately 15 degrees.
15. The carrier of claim 14 , wherein when the broadband x-ray source is operated to produce broadband x-ray radiation and the housing is coupled to the broadband x-ray source and is accommodating the secondary target, the carrier is configured to emit monochromatic x-ray radiation having a monochromaticity of greater than or equal to 0.95 across a field of view of at least approximately 15 degrees.