Characterization of micro pore optics for full-field X-ray fluorescence imaging
(2023) In Journal of Instrumentation 18(1).- Abstract
Elemental mapping images can be achieved through step scanning imaging using pinhole optics or micro pore optics (MPO), or alternatively by full-field X-ray fluorescence imaging (FF-XRF). X-ray optics for FF-XRF can be manufactured with different micro-channel geometries such as square, hexagonal or circular channels. Each optic geometry creates different imaging artefacts. Square-channel MPOs generate a high intensity central spot due to two reflections via orthogonal channel walls inside a single channel, which is the desirable part for image formation, and two perpendicular lines forming a cross due to reflections in one plane only. Thus, we have studied the performance of a square-channel MPO in an FF-XRF imaging system. The setup... (More)
Elemental mapping images can be achieved through step scanning imaging using pinhole optics or micro pore optics (MPO), or alternatively by full-field X-ray fluorescence imaging (FF-XRF). X-ray optics for FF-XRF can be manufactured with different micro-channel geometries such as square, hexagonal or circular channels. Each optic geometry creates different imaging artefacts. Square-channel MPOs generate a high intensity central spot due to two reflections via orthogonal channel walls inside a single channel, which is the desirable part for image formation, and two perpendicular lines forming a cross due to reflections in one plane only. Thus, we have studied the performance of a square-channel MPO in an FF-XRF imaging system. The setup consists of a commercially available MPO provided by Photonis and a Timepix3 readout chip with a silicon detector. Imaging of fluorescence from small metal particles has been used to obtain the point spread function (PSF) characteristics. The transmission through MPO channels and variation of the critical reflection angle are characterized by measurements of fluorescence from copper and titanium metal fragments. Since the critical angle of reflection is energy dependent, the cross-arm artefacts will affect the resolution differently for different fluorescence energies. It is possible to identify metal fragments due to the form of the PSF function. The PSF function can be further characterized using a Fourier transform to suppress diffuse background signals in the image.
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- author
- An, S. LU ; Krapohl, D. ; Thörnberg, B. ; Roudot, R. ; Schyns, E. and Norlin, B.
- organization
- publishing date
- 2023-01-12
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Scintillators and scintillating fibres and light guides, Spectrometers, X-ray fluorescence (XRF) systems, X-ray transport and focusing
- in
- Journal of Instrumentation
- volume
- 18
- issue
- 1
- article number
- C01017
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85146494710
- ISSN
- 1748-0221
- DOI
- 10.1088/1748-0221/18/01/C01017
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2023 The Author(s). Published by IOP Publishing Ltd on behalf of Sissa Medialab.
- id
- 5d0662fb-a531-4a15-9f83-257a6d4a84e5
- date added to LUP
- 2023-01-27 09:44:51
- date last changed
- 2023-02-13 19:10:01
@article{5d0662fb-a531-4a15-9f83-257a6d4a84e5,
abstract = {{<p>Elemental mapping images can be achieved through step scanning imaging using pinhole optics or micro pore optics (MPO), or alternatively by full-field X-ray fluorescence imaging (FF-XRF). X-ray optics for FF-XRF can be manufactured with different micro-channel geometries such as square, hexagonal or circular channels. Each optic geometry creates different imaging artefacts. Square-channel MPOs generate a high intensity central spot due to two reflections via orthogonal channel walls inside a single channel, which is the desirable part for image formation, and two perpendicular lines forming a cross due to reflections in one plane only. Thus, we have studied the performance of a square-channel MPO in an FF-XRF imaging system. The setup consists of a commercially available MPO provided by Photonis and a Timepix3 readout chip with a silicon detector. Imaging of fluorescence from small metal particles has been used to obtain the point spread function (PSF) characteristics. The transmission through MPO channels and variation of the critical reflection angle are characterized by measurements of fluorescence from copper and titanium metal fragments. Since the critical angle of reflection is energy dependent, the cross-arm artefacts will affect the resolution differently for different fluorescence energies. It is possible to identify metal fragments due to the form of the PSF function. The PSF function can be further characterized using a Fourier transform to suppress diffuse background signals in the image.</p>}},
author = {{An, S. and Krapohl, D. and Thörnberg, B. and Roudot, R. and Schyns, E. and Norlin, B.}},
issn = {{1748-0221}},
keywords = {{Scintillators and scintillating fibres and light guides; Spectrometers; X-ray fluorescence (XRF) systems; X-ray transport and focusing}},
language = {{eng}},
month = {{01}},
number = {{1}},
publisher = {{IOP Publishing}},
series = {{Journal of Instrumentation}},
title = {{Characterization of micro pore optics for full-field X-ray fluorescence imaging}},
url = {{http://dx.doi.org/10.1088/1748-0221/18/01/C01017}},
doi = {{10.1088/1748-0221/18/01/C01017}},
volume = {{18}},
year = {{2023}},
}