Patent
X-ray phase-contrast imaging
| العنوان: | X-ray phase-contrast imaging |
|---|---|
| Patent Number: | 9,801,600 |
| تاريخ النشر: | October 31, 2017 |
| Appl. No: | 14/943157 |
| Application Filed: | November 17, 2015 |
| مستخلص: | Systems and methods for X-ray phase-contrast imaging (PCI) are provided. A quasi-periodic phase grating can be positioned between an object being imaged and a detector. An analyzer grating can be disposed between the phase grating and the detector. Second-order approximation models for X-ray phase retrieval using paraxial Fresnel-Kirchhoff diffraction theory are also provided. An iterative method can be used to reconstruct a phase-contrast image or a dark-field image. |
| Inventors: | Wang, Ge (Loudonville, NY, US); Xi, Yan (Troy, NY, US); Cong, Wenxiang (Albany, NY, US) |
| Assignees: | Rensselaer Polytechnic Institute (Troy, NY, US) |
| Claim: | 1. An X-ray phase-contrast imaging (PCI) system, comprising: an X-ray source; a detector; a first grating disposed between the X-ray source and the detector; and a second grating disposed between the first grating and the detector, wherein the first grating is a quasi-periodical phase grating such that a period of the first grating varies across the first grating and changes equally in both lateral directions. |
| Claim: | 2. The system according to claim 1 , wherein the second grating is an analyzer grating. |
| Claim: | 3. The system according to claim 1 , wherein the detector is flat. |
| Claim: | 4. The system according to claim 3 , wherein the detector is a flat detector array. |
| Claim: | 5. The system according to claim 1 , wherein the second grating is flat. |
| Claim: | 6. The system according to claim 1 , wherein the first grating is curved. |
| Claim: | 7. The system according to claim 6 , wherein the first grating is a cylindrical grating or a spherical grating. |
| Claim: | 8. The system according to claim 1 , wherein the detector is flat, wherein the second grating is flat, and wherein the first grating is a cylindrical grating or a spherical grating. |
| Claim: | 9. The system according to claim 1 , further comprising a source grating disposed between the X-ray source and the first grating. |
| Claim: | 10. The system according to claim 9 , wherein the source grating is a cylindrical grating or a spherical grating. |
| Claim: | 11. The system according to claim 1 , wherein the period of the first grating varies the same way in both lateral directions as an angle is varied positively or negatively by the same amount from a point on the first grating where X-rays from the X-ray source are centered during imaging. |
| Claim: | 12. A method of performing X-ray phase-contrast imaging, comprising: providing the imaging system according to claim 1 ; positioning an object to be imaged between the X-ray source and the first grating; and imaging the object using the system. |
| Claim: | 13. The method according to claim 12 , wherein the detector is flat, wherein the second grating is flat, and wherein the first grating is a cylindrical grating or a spherical grating. |
| Claim: | 14. The method according to claim 13 , wherein the second grating is an analyzer grating. |
| Claim: | 15. The method according to claim 13 , wherein the imaging system further comprises a source grating disposed between the X-ray source and the first grating, wherein the source grating is a cylindrical grating or a spherical grating, and wherein the object is positioned between the source grating and the first grating for imaging of the object. |
| Claim: | 16. The system according to claim 1 , wherein the first grating is disposed closer to the detector than it is to the X-ray source such that the system is configured so the first grating is disposed between the detector and an object to be imaged. |
| Patent References Cited: | 2013/0028378 January 2013 Stutman 2015/0092914 April 2015 Anton 2015/0279496 October 2015 Bauer 2016/0022235 January 2016 Ning |
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| Primary Examiner: | Wong, Don |
| Attorney, Agent or Firm: | Saliwanchik, Lloyd & Eisenschenk |
| رقم الانضمام: | edspgr.09801600 |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |