Super-resolution X-ray imaging with hybrid pixel detectors using electromagnetic source stepping
Dreier, Till LU
; Bech, Martin
LU
and Lundström, Ulf
(2020)
In Journal of Instrumentation
15(3).
- Abstract
- With increasing demand for high-resolution X-ray images, the super-resolution method allows to estimate a single high-resolution image from several low-resolution images. Hybrid pixel detectors provide high-quality and low-resolution images, which makes them particularlywell suited for super-resolution. However, such detectors consist of a limited number of pixels at high cost. Applying super-resolution with hybrid pixel detectors shows that it is a viable method to obtain high-resolution images. The point-spread function of such detectors can be idealised to be 1 pixel, adding no blur into the image making such detectors the ideal choice for the application of super- resolution X-ray imaging. However, there are charge sharing effects... (More)
- With increasing demand for high-resolution X-ray images, the super-resolution method allows to estimate a single high-resolution image from several low-resolution images. Hybrid pixel detectors provide high-quality and low-resolution images, which makes them particularlywell suited for super-resolution. However, such detectors consist of a limited number of pixels at high cost. Applying super-resolution with hybrid pixel detectors shows that it is a viable method to obtain high-resolution images. The point-spread function of such detectors can be idealised to be 1 pixel, adding no blur into the image making such detectors the ideal choice for the application of super- resolution X-ray imaging. However, there are charge sharing effects between the pixels caused by the energy and impact position of incoming photons. Utilising an X-ray source, which allows magnetic stepping of the X-ray spot, several slightly shifted images can be obtained without requiring mechanical movements. Registering the shifts between individual images with sub-pixel precision allows to estimate a high-resolution image. With repeatable and equally spaced X-ray spot position patterns, sufficient information can be obtained with only a few images. In this paper, we present the application of super-resolution for X-ray imaging using a Pilatus 100K hybrid pixel detector from Dectris Ltd. and a prototype micro-focus X-ray source from Excillum AB. Moreover, we analyse the image quality for applications in X-ray radiography and tomography. Using a sufficient number of low-resolution images allows us to achieve an increase in resolution, without introducing significant blur or artefacts into the image. Here we quantify the effects on the quality of resulting super-resolution images using different methods of image interpolation, interpolation factors, shifts of the sample on the detector, and amount of low-resolution images. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/7613a936-8fe7-425e-9be7-42e8de5076c5
- author
- Dreier, Till
LU
; Bech, Martin
LU
and Lundström, Ulf
- organization
- publishing date
- 2020-03-02
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Instrumentation
- volume
- 15
- issue
- 3
- article number
- C03002
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85084174447
- ISSN
- 1748-0221
- DOI
- 10.1088/1748-0221/15/03/C03002
- language
- English
- LU publication?
- yes
- id
- 7613a936-8fe7-425e-9be7-42e8de5076c5
- date added to LUP
- 2020-03-04 09:30:00
- date last changed
- 2023-04-10 09:15:44
@article{7613a936-8fe7-425e-9be7-42e8de5076c5,
abstract = {{With increasing demand for high-resolution X-ray images, the super-resolution method allows to estimate a single high-resolution image from several low-resolution images. Hybrid pixel detectors provide high-quality and low-resolution images, which makes them particularlywell suited for super-resolution. However, such detectors consist of a limited number of pixels at high cost. Applying super-resolution with hybrid pixel detectors shows that it is a viable method to obtain high-resolution images. The point-spread function of such detectors can be idealised to be 1 pixel, adding no blur into the image making such detectors the ideal choice for the application of super- resolution X-ray imaging. However, there are charge sharing effects between the pixels caused by the energy and impact position of incoming photons. Utilising an X-ray source, which allows magnetic stepping of the X-ray spot, several slightly shifted images can be obtained without requiring mechanical movements. Registering the shifts between individual images with sub-pixel precision allows to estimate a high-resolution image. With repeatable and equally spaced X-ray spot position patterns, sufficient information can be obtained with only a few images. In this paper, we present the application of super-resolution for X-ray imaging using a Pilatus 100K hybrid pixel detector from Dectris Ltd. and a prototype micro-focus X-ray source from Excillum AB. Moreover, we analyse the image quality for applications in X-ray radiography and tomography. Using a sufficient number of low-resolution images allows us to achieve an increase in resolution, without introducing significant blur or artefacts into the image. Here we quantify the effects on the quality of resulting super-resolution images using different methods of image interpolation, interpolation factors, shifts of the sample on the detector, and amount of low-resolution images.}},
author = {{Dreier, Till and Bech, Martin and Lundström, Ulf}},
issn = {{1748-0221}},
language = {{eng}},
month = {{03}},
number = {{3}},
publisher = {{IOP Publishing}},
series = {{Journal of Instrumentation}},
title = {{Super-resolution X-ray imaging with hybrid pixel detectors using electromagnetic source stepping}},
url = {{http://dx.doi.org/10.1088/1748-0221/15/03/C03002}},
doi = {{10.1088/1748-0221/15/03/C03002}},
volume = {{15}},
year = {{2020}},
}