System for extending the dynamic gain of an X-ray detector
View Patent ↗A method and apparatus are provided for extending a dynamic range of an X-ray imaging system. The method includes the steps of detecting a plurality of X-ray beams, amplifying each of the plurality of detected X-ray beams using a first gain value, amplifying each of the plurality of detected X-ray beams using a second gain value, and forming an X-ray image from the detected X-ray beams amplified by the first gain value and from the detected X-ray beams amplified by the second gain value.
1. A method of extending a dynamic range of an X-ray imaging system, such method comprising the steps of:
detecting first and second substantially identical samples of each of a plurality of X-ray beams;
amplifying each first sample of the substantially identical samples using a first gain value;
amplifying each second sample of the substantially identical samples using a second gain value; and
forming an X-ray image from the detected X-ray beams amplified by the first gain value and from the detected X-ray beams amplified by the second gain value.
2. The method of extending a dynamic range of an X-ray imaging system as in claim 1 wherein the step of detecting the plurality of X-ray beams further comprises providing a scintillating element for converting each of the plurality of X-ray beams into visible or near-visible light.
3. The method of extending a dynamic range of an X-ray imaging system as in claim 2 further comprising disposing first and second photodiodes on each scintillating element for detecting the visible or near-visible light from the scintillating element.
4. The method of extending a dynamic range of an X-ray imaging system as in claim 1 further comprising forming a first X-ray image from the detected X-ray beams amplified by the first gain value and a second X-ray image from the detected X-ray beams amplified by the second gain value.
5. The method of extending a dynamic range of an X-ray imaging system as in claim 1 further comprising forming a single X-ray image from the detected X-ray beams amplified by the first gain value and from the detected X-ray beams amplified by the second gain value.
6. The method of extending a dynamic range of an X-ray imaging system as in claim 5 further comprising displaying pixels from the detected X-ray beams amplified by the first gain value with a first color value and pixels from the detected X-ray beams amplified by the second gain value using a second color value.
7. The method of extending a dynamic range of an X-ray imaging system as in claim 5 further comprising displaying pixels from the detected X-ray beams amplified by the first and second gain values normalized to a single gray-scale pixel range.
8. An apparatus for extending a dynamic range of an X-ray imaging system, such apparatus comprising:
means for detecting first and second substantially identical samples of a plurality of X-ray beams;
means for amplifying each first sample of the substantially identical samples using a first gain value;
means for amplifying each second sample of the substantially identical samples using a second gain value; and
means for forming an X-ray image from the detected X-ray beams amplified by the first gain value and from the detected X-ray beams amplified by the second gain value.
9. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 8 wherein the means for detecting the plurality of X-ray beams further comprises means for converting each of the plurality of X-ray beams into visible or near-visible light.
10. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 9 wherein the means for converting each of the plurality of X-ray beams into near visible or near-visible light further comprises a scintillating element.
11. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 10 wherein the scintillating element further comprises a single crystal or a polycrystalline material.
12. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 10 wherein the scintillating element further comprises a ceramic material.
13. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 10 wherein the scintillating element further comprises plastic.
14. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 9 further comprising means for detecting the visible light disposed on the means for converting.
15. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 8 further comprising means for forming a first X-ray image from the detected X-ray beams amplified by the first gain value and a second X-ray image from the detected X-ray beams amplified by the second gain value.
16. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 8 further comprising means for forming a single X-ray image from the detected X-ray beams amplified by the first gain value and from the detected X-ray beams amplified by the second gain value.
17. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 16 further comprising means for displaying pixels from the detected X-ray beams amplified by the first gain value with a first color value and pixels from the detected X-ray beams amplified by the second gain value using a second color value.
18. An apparatus for extending a dynamic range of an X-ray imaging system, such apparatus comprising:
a detector array adapted to detect first and second substantially identical samples of each of a plurality of X-ray beams;
a first amplifier adapted to amplify each first sample of the substantially identical samples using a first gain value;
a second amplifier adapted to amplify each second sample of the substantially identical samples using a second gain value; and
an image processor adapted to form an X-ray image from the detected X-ray beams amplified by the first gain value and from the detected X-ray beams amplified by the second gain value.
19. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 18 wherein the detector array further comprises a scintillating element adapted to convert each of the plurality of X-ray beams into visible or near-visible light.
20. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 19 wherein the scintillating element further comprises a single crystal or a polycrystalline material.
21. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 19 wherein the scintillating element further comprises a ceramic material.
22. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 19 wherein the scintillating element further comprises plastic.
23. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 19 further comprising a first photodiode and a second photodiode disposed on the scintillating element for detecting the visible or near-visible light.
24. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 18 further comprising a first X-ray image for displaying information from the detected X-ray beams amplified by the first gain value and a second X-ray image for displaying information from the detected X-ray beams amplified by the second gain value.
25. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 18 further comprising an image processor adapted to form a single X-ray image from the detected X-ray beams amplified by the first gain value and from the detected X-ray beams amplified by the second gain value.
26. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 25 wherein the single X-ray image further comprises pixels from the detected X-ray beams amplified by the first gain value with a first color value and pixels from the detected X-ray beams amplified by the second gain value using a second color value.
27. The apparatus for extending a dynamic range of an X-ray imaging system as in claim 25 wherein the image processor further comprises a normalizing processor adapted to normalize the detected X-ray beams amplified by the first and second gain values to a predetermined pixel range.
28. A method of extending a dynamic range of an X-ray imaging system, such method comprising the steps of:
detecting first and second substantially identical samples of a non-coincident portion of an X-ray beam within each of a plurality of regularly spaced detector areas;
amplifying each of the plurality of detected portions using a first gain value for the first samples of the substantially identical samples and using a second gain value for the second samples of the substantially identical samples; and
forming an X-ray image from the amplified portions at the first gain value and from the amplified portions at the second gain value.
29. A method of extending a dynamic range of an X-ray detector, such method comprising the steps of:
providing an X-ray to optical converter;
coupling a first detector of a first gain value to the converter;
coupling a second detector of a second gain value to the converter; and
selectively coupling the first and second detectors to an image reconstruction processor based upon a magnitude of an X-ray signal impinging upon the converter.