Systems and methods for temporal multiplexing X-ray imaging
The present subject matter relates to systems and methods for temporal multiplexing x-ray imaging of dynamic objects with high temporal resolution and fast imaging speed. A pulsed x-ray beam can irradiate an object undergoing a range of motion such as a cyclic motion. Multiple x-ray images can be acquired at different phases within a single motion cycle or range of the object. The multiple x-ray images can be demultiplexed to produce an individual phase image. Compared to sequential imaging, temporal multiplexing x-ray imaging can achieve high temporal resolution of dynamics object in multiple phases with imaging time comparable to that of a single phase. Temporal multiplexing x-ray imaging can thus be applied to a wide variety of applications, including biomedical imaging and industrial non-destructive testing.
1. A method of temporal multiplexing x-ray imaging of a dynamic object, the method comprising:
(a) passing a sequenced combination of x-ray beam pulses through an object undergoing cyclic motion, each of the x-ray beam pulses corresponding to a temporal phase of the cyclic motion;
(b) detecting the x-ray beam pulses;
(c) generating a multiplexed x-ray image of the combination of x-ray beam pulses passed through the object during a single cycle of the cyclic motion; and
(d) demultiplexing the multiplexed x-ray image to generate an x-ray image of the object for each temporal phase.
2. The method of claim 1 , comprising generating a plurality of additional multiplexed x-ray images of each combination of x-ray beam pulses passed through the object during further cycles of the cyclic motion.
3. The method of claim 1 , wherein passing a sequenced combination of x-ray beam pulses comprises using a different sequences of x-ray beam pulses for each cycle of the cyclic motion.
4. The method of claim 3 , wherein the different sequences of x-ray beam pulses are selected based on a Hadamard binary matrix.
5. The method of claim 1 , wherein the object undergoes non periodic cyclic motion.
6. The method of claim 1 , wherein passing a sequenced combination of x-ray beam pulses comprises emitting the x-ray beam pulses from a carbon-nanotube-based field emission x-ray source.
7. The method of claim 1 , wherein the x-ray beam pulses each have an x-ray exposure time that is shorter than a single cycle integration time for detecting the x-ray beam pulses.
8. The method of claim 1 , wherein passing a sequenced combination of x-ray beam pulses through an object comprises synchronizing the x-ray beam pulses with the motion of the object.
9. The method of claim 1 , wherein demultiplexing the multiplexed x-ray image comprises applying an inverse Hadamard binary matrix.
10. A method of temporal multiplexing x-ray imaging of a dynamic object, the method comprising:
(a) passing a sequenced combination of x-ray beam pulses through an object undergoing cyclic motion, each of the x-ray beam pulses corresponding to a temporal phase of the cyclic motion;
(b) detecting the x-ray beam pulses;
(c) generating a plurality of multiplexed x-ray images of the combination of x-ray beam pulses passed through the object, each of the plurality of multiplexed x-ray images being generated from the combination of x-ray beam pulses passed through the object during different cycles of the cyclic motion; and
(d) demultiplexing the plurality of multiplexed x-ray images to generate an x-ray image of the object for each temporal phase.
11. The method of claim 10 , further comprising combining each x-ray image corresponding to a given temporal phase.
12. An x-ray imaging system comprising:
a single-beam x-ray source operable for passing a pulsed x-ray beam through an object undergoing cyclic motion;
an x-ray detector;
a controller in communication with the x-ray source and the object and being operable to generate a sequenced combination of x-ray beam pulses from the x-ray source and acquire one or more multiplexed x-ray images of the object undergoing cyclic motion, each of the x-ray beam pulses corresponding to a temporal phase of the cyclic motion;
an imaging processing unit operable to de-multiplex the multiplexed images to obtain images of the object at different temporal phases of the cyclic motion.
13. The system of claim 12 , wherein the x-ray source comprises a field emission x-ray source.
14. The system of claim 12 , wherein the field emission x-ray source comprises a carbon-nanotube-based x-ray source.
15. The system of claim 12 , wherein the digital area detector comprises a flat panel x-ray detector.
16. The system of claim 12 , wherein an x-ray exposure time of the x-ray source is shorter than a detector integration time of the x-ray detector.
17. The system of claim 12 , wherein the controller is in communication with the detector.