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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)
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author
; and
organization
publishing date
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
2020-06-14 06:31:03
@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},
}