Construction and evaluation of a high-energy grating-based x-ray phase-contrast imaging setup
| Autor: | Andreas Wolf, Thilo Michel, Thomas Weber, Gisela Anton, Florian Horn, Maria Seifert, Georg Pelzer, Christian Hauke, Max Schuster, Sebastian Lachner, Jens Rieger, Veronika Ludwig, Johannes Wandner |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Image quality business.industry Attenuation 02 engineering and technology Grating 021001 nanoscience & nanotechnology 030218 nuclear medicine & medical imaging 03 medical and health sciences Interferometry 0302 clinical medicine Optics X-Ray Phase-Contrast Imaging Nondestructive testing Medical imaging 0210 nano-technology business Visibility |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2216879 |
| Popis: | Interferometric x-ray imaging becomes more and more attractive for appl ications such as medical imaging ornon-destructive testing, because it provides the opportunity to obtain additional information on the internalstructure of radiographed objects. 12 Therefore, three types of images are acquired: An attenuation image likein conventional x-ray imaging, an image of the di erential phase-shift gen erated by the object and the so calleddark- eld image, which contains information about the object's granularit y even on sub-pixel scale. 3 However, most experiments addressing grating-based x-ray phase-con trast imaging with polychromatic sourcesare restricted to energies up to about 40keV. For the application of this i maging method to thicker objectslike human specimens or dense components, higher tube voltages are req uired. This is why we designed andconstructed a laboratory setup for high energies, which is able to image l arger objects. 4 To evaluate the performance of the setup, the mean visibility of the eld of view was measured for several tubevoltages. The result shows that the mean visibility has a peak value of 23% at a tube voltage of 60kV andis constantly greater than 16% up to a tube voltage of 120kV. Thus, good image qual ity is provided even forhigh energies. To further substantiate the performance of the setup at high energies, a human ex-vivo footwas examined at a tube voltage of 75kV. The interferometric x-ray images sh ow a good image quality and apromising diagnostic power.Keywords: x-ray imaging, di erential phase-contrast, high-energy phase-contras t, Talbot-Lau interferometry |
| Databáze: | OpenAIRE |
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