We present here a new method of performing X-ray edge-subtraction ptychographic imaging by combining multiple harmonics from an undulator synchrotron source and an energy discriminating photon counting detector. Conventionally, monochromatic far-field X-ray ptychography is used to perform edge subtraction through the use of multiple monochromatic energy scans to obtain spectral information for a variety of applications. Here, we use directly the undulator spectrum from a synchrotron source, selecting two separate harmonics post sample using the Pixirad-1/Pixie-III detector. The result is two monochromatic images, above and below an absorption edge of interest. The proposed method is applied to obtain Au L-edge subtraction imaging of a Au-Ni grid test sample. The Au L-edge subtraction is particularly relevant for the identification of gold nanoparticles for biomedical applications. Switching the energy scan mechanism from a mechanical monochromator to an electronic detector threshold allows for faster spectral data collection with improved stability.

Brun, F., Di Trapani, V., Batey, D., Cipiccia, S., Rau, C. (2020). Edge-subtraction X-ray ptychographic imaging with pink beam synchrotron radiation and a single photon-counting detector. SCIENTIFIC REPORTS, 10(1) [10.1038/s41598-020-63161-x].

Edge-subtraction X-ray ptychographic imaging with pink beam synchrotron radiation and a single photon-counting detector

Di Trapani, Vittorio;
2020-01-01

Abstract

We present here a new method of performing X-ray edge-subtraction ptychographic imaging by combining multiple harmonics from an undulator synchrotron source and an energy discriminating photon counting detector. Conventionally, monochromatic far-field X-ray ptychography is used to perform edge subtraction through the use of multiple monochromatic energy scans to obtain spectral information for a variety of applications. Here, we use directly the undulator spectrum from a synchrotron source, selecting two separate harmonics post sample using the Pixirad-1/Pixie-III detector. The result is two monochromatic images, above and below an absorption edge of interest. The proposed method is applied to obtain Au L-edge subtraction imaging of a Au-Ni grid test sample. The Au L-edge subtraction is particularly relevant for the identification of gold nanoparticles for biomedical applications. Switching the energy scan mechanism from a mechanical monochromator to an electronic detector threshold allows for faster spectral data collection with improved stability.
2020
Brun, F., Di Trapani, V., Batey, D., Cipiccia, S., Rau, C. (2020). Edge-subtraction X-ray ptychographic imaging with pink beam synchrotron radiation and a single photon-counting detector. SCIENTIFIC REPORTS, 10(1) [10.1038/s41598-020-63161-x].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1106805