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 monochromatic x-ray device comprising:
an electron source configured to emit electrons;
a primary target configured to produce broadband x-ray radiation in response to incident electrons from the electron source;
a secondary target configured to generate monochromatic x-ray radiation via fluorescence in response to incident broadband x-ray radiation; and
a housing for the secondary target comprising an aperture through which monochromatic x-ray radiation from the secondary target is emitted, the housing configured to position the secondary target so that at least some of the broadband x-ray radiation emitted by the primary target is incident on the secondary target so that, when the monochromatic x-ray device is operated, monochromatic x-ray radiation is emitted via the aperture having a monochromaticity of greater than or equal to 0.7 across a field of view of at least approximately 15 degrees.
2 . The monochromatic x-ray device of claim 1 , wherein, when the device is operated, monochromatic x-ray radiation is emitted via the aperture having a monochromaticity of greater than or equal to 0.8 across a field of view of at least approximately 15 degrees.
3 . The monochromatic x-ray device of claim 1 , wherein, when the device is operated, monochromatic x-ray radiation is emitted via the aperture having a monochromaticity of greater than or equal to 0.9 across a field of view of at least approximately 15 degrees.
4 . The monochromatic x-ray device of claim 1 , wherein, when the device is operated, monochromatic x-ray radiation is emitted via the aperture having a monochromaticity of greater than or equal to 0.95 across a field of view of at least approximately 15 degrees.
5 . The monochromatic x-ray device of claim 1 , wherein the housing comprises:
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.
6 . The monochromatic x-ray device of claim 5 , 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.
7 . The monochromatic x-ray device of claim 6 , wherein the transmissive portion comprises at least one of aluminum, carbon, carbon fiber, boron, boron nitride, beryllium oxide, silicon and silicon nitride.
8 . The monochromatic x-ray device of claim 5 , 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.
9 . The monochromatic x-ray device of claim 5 , wherein the housing is configured such that, when the secondary target is accommodated within the housing, at least a first portion of the secondary target is positioned within the transmissive portion of the housing and a second portion of the secondary target is positioned within the blocking portion of the housing.
10 . The monochromatic x-ray device of claim 9 , 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 the second portion of the secondary target when the first cylindrical portion accommodates the secondary target.
11 . The monochromatic x-ray device of claim 10 , wherein the secondary target is conical, wherein the first cylindrical portion is configured to accommodate at least a portion of the 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.
12 . The monochromatic x-ray device of claim 10 , 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.
13 . The monochromatic x-ray device of claim 10 , 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.
14 . The monochromatic x-ray device of claim 10 , wherein the second cylindrical portion is configured to overlap at least 3 mm of the secondary target when the first cylindrical portion accommodates the secondary target.
15 . The monochromatic x-ray device of claim 4 , 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.
16 . The monochromatic x-ray device of claim 1 , wherein the housing is configured to be removable.
17 . A method of generating monochromatic x-rays comprising:
generating broadband x-ray radiation from a primary target that, in response to incident electrons from an electron source, produces the broadband x-ray radiation;
generating monochromatic x-ray radiation from a secondary target that, in response to incident broadband x-ray radiation from the primary target, produces the monochromatic x-ray radiation via fluorescence; and
emitting at least some of the monochromatic x-ray radiation via an aperture;
blocking at least some of the broadband x-ray radiation such that the monochromatic x-ray radiation emitted via the aperture has a monochromaticity of greater than or equal to 0.7 across a field of view of at least approximately 15 degrees.
18 . The method of claim 17 , wherein the monochromatic x-ray radiation emitted via the aperture has a monochromaticity of greater than or equal to 0.8 across a field of view of at least approximately 15 degrees.
19 . The method of claim 17 , wherein the monochromatic x-ray radiation emitted via the aperture has a monochromaticity of greater than or equal to 0.9 across a field of view of at least approximately 15 degrees.
20 . The method of claim 17 , wherein the monochromatic x-ray radiation emitted via the aperture has a monochromaticity of greater than or equal to 0.95 across a field of view of at least approximately 15 degrees.