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Title: Refraction Contrast Imaging by Using MIRRORCLE-Type Tabletop Synchrotron

Abstract

MIRRORCLE type tabletop synchrotron is suitable for magnified hard x-ray imaging due to its micron size x-ray source, wide radiation angle, x-ray spectrum ranging from a few keV to 6 MeV and high flux output. It is known that the magnified imaging by a micron size x-ray source provides a high spatial resolution image, and a sharply enhanced edge effect for weakly absorbing objects. This x-ray imaging technique is known as a phase-contrast imaging. In this work, we performed a phase contrast imaging of a simple shape objects using an imaging plate for studying the characteristics of the edge enhancement by MIRRORCLE. It turns out that the edge effect is enhanced for higher magnification and smaller source size. The characteristics of the edge effect can be explained by using the refraction effect. Furthermore, the refraction contrast is enhanced when the imaging system resolution is decreased. By using MIRRORCLE, we can obtain refractive-contrast images of objects as large as human. The magnified x-ray imaging capabilities of MIRRORCLE are a great advantage to medical imaging and NDI of organic objects.

Authors:
; ;  [1];  [1];  [2]; ;  [3]
  1. Faculty of science and Engineering, Ritsumeikan University, Kusatsu, Shiga, 525-8577 (Japan)
  2. (Japan)
  3. Photon Production Laboratory Ltd, Omihachiman, Shiga, 523-0898 (Japan)
Publication Date:
OSTI Identifier:
21056939
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 902; Journal Issue: 1; Conference: 2. international symposium on portable synchrotron light sources and advanced applications, Shiga (Japan), 15-17 Jan 2007; Other Information: DOI: 10.1063/1.2723638; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; BIOMEDICAL RADIOGRAPHY; HARD X RADIATION; IMAGES; KEV RANGE; MEV RANGE; REFRACTION; SPATIAL RESOLUTION; SYNCHROTRON RADIATION; SYNCHROTRONS; X-RAY RADIOGRAPHY; X-RAY SOURCES; X-RAY SPECTRA

Citation Formats

Hirai, T., Sasaki, M., Nihira, T., Yamada, H., Synchrotron Light Life Science Center, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Morita, M., and Hasegawa, D. Refraction Contrast Imaging by Using MIRRORCLE-Type Tabletop Synchrotron. United States: N. p., 2007. Web. doi:10.1063/1.2723638.
Hirai, T., Sasaki, M., Nihira, T., Yamada, H., Synchrotron Light Life Science Center, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Morita, M., & Hasegawa, D. Refraction Contrast Imaging by Using MIRRORCLE-Type Tabletop Synchrotron. United States. doi:10.1063/1.2723638.
Hirai, T., Sasaki, M., Nihira, T., Yamada, H., Synchrotron Light Life Science Center, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Morita, M., and Hasegawa, D. Fri . "Refraction Contrast Imaging by Using MIRRORCLE-Type Tabletop Synchrotron". United States. doi:10.1063/1.2723638.
@article{osti_21056939,
title = {Refraction Contrast Imaging by Using MIRRORCLE-Type Tabletop Synchrotron},
author = {Hirai, T. and Sasaki, M. and Nihira, T. and Yamada, H. and Synchrotron Light Life Science Center, Ritsumeikan University, Kusatsu, Shiga, 525-8577 and Morita, M. and Hasegawa, D.},
abstractNote = {MIRRORCLE type tabletop synchrotron is suitable for magnified hard x-ray imaging due to its micron size x-ray source, wide radiation angle, x-ray spectrum ranging from a few keV to 6 MeV and high flux output. It is known that the magnified imaging by a micron size x-ray source provides a high spatial resolution image, and a sharply enhanced edge effect for weakly absorbing objects. This x-ray imaging technique is known as a phase-contrast imaging. In this work, we performed a phase contrast imaging of a simple shape objects using an imaging plate for studying the characteristics of the edge enhancement by MIRRORCLE. It turns out that the edge effect is enhanced for higher magnification and smaller source size. The characteristics of the edge effect can be explained by using the refraction effect. Furthermore, the refraction contrast is enhanced when the imaging system resolution is decreased. By using MIRRORCLE, we can obtain refractive-contrast images of objects as large as human. The magnified x-ray imaging capabilities of MIRRORCLE are a great advantage to medical imaging and NDI of organic objects.},
doi = {10.1063/1.2723638},
journal = {AIP Conference Proceedings},
number = 1,
volume = 902,
place = {United States},
year = {Fri Mar 30 00:00:00 EDT 2007},
month = {Fri Mar 30 00:00:00 EDT 2007}
}
  • We report that the magnified imaging using the portable synchrotron named MIRRORCLE has unique advantages for non-destructive inspection (NDI) of some products. This machine is a high energy x-ray source which can have a micron-sized point source, which is different from the conventional synchrotron, linear accelerator and the x-ray tube. The images produced with micron-sized point source and wide spectrum can display in detail the industrial products containing several materials in detail. The obtained x-ray images characterization is expected to provide a new tool for NDI of industrial products.
  • Purpose: The implementation of in-line x-ray phase contrast imaging (PCI) for soft-tissue patient imaging is hampered by the lack of a bright and spatially coherent x-ray source that fits into the hospital environment. This article provides a quantitative characterization of the phase-contrast enhancement of a PCI system based on the miniature synchrotron technology MIRRORCLE-6X. Methods: The phase-contrast effect was measured using an edge response of a plexiglass plate as a function of the incident angle of radiation. We have developed a comprehensive x-ray propagation model based on the system's components, properties, and geometry in order to interpret the measurement data.more » Monte-Carlo simulations are used to estimate the system's spectral properties and resolution. Results: The measured ratio of the detected phase-contrast to the absorption contrast is currently in the range 100% to 200%. Experiments show that with the current implementation of the MIRRORCLE-6X, a target smaller than 30-40 {mu}m does not lead to a larger phase-contrast. The reason for this is that the fraction of x-rays produced by the material (carbon filament and glue) that is used for mounting the target in the electron beam is more than 25% of the total amount of x-rays produced. This increases the apparent source size. The measured phase-contrast is at maximum two times larger than the absorption contrast with the current set-up. Conclusions: Calculations based on our model of the present imaging system predict that the phase-contrast can be up to an order of magnitude larger than the absorption contrast in case the materials used for mounting the target in the electron beam do not (or hardly) produce x-rays. The methods described in this paper provide vital feedback for guiding future modifications to the design of the x-ray target of MIRRORCLE-type system and configuration of the in-line PCI systems in general.« less
  • MIRRORCLE is a tabletop/portable synchrotron light source. It generates 10 mW order far infrared, watt order EUV/soft X-ray, and brilliant hard X-rays in 10 to 1000 keV range. MIRRORCLE is also a synchrotron that can generate directly monochromatic X-ray beam. MIRRORCLE is a medical diagnostics system similar to a X-ray tube radiology, but is very different in its fine spatial resolution and coherence of X-ray. A difference in the material density instead of in the atomic number is distinguished by the phase contrast method, due to its highly coherent beam. MIRRORCLE is a non-destructive testing system for more than 10cmmore » thick heavy constructions with 10-{mu}m order fine spatial resolution. MIRRORCLE is an EUV lithography source, a laboratory size protein crystallography system, as well as a X-ray microscope. We discuss advanced features of this multi-functional light source MIRRORCLE.« less
  • MIRRORCLE-20SX tabletop synchrotron is under development for EUV lithography. We measured the soft X ray power from the existing synchrotron MIRRORCLE-6X (6MeV machine). Transition radiation power from one thin foil target was detected by a plastic scintillator, which is calibrated by using conventional synchrotron radiation source at AIST. The output EUV power was 2.6 mW. From the experimental result of MIRRORCLE-6X we can extrapolate the EUV power for the 20MeV machine as large as one watt per foil. We expect 100 watt EUV by 100 of foils.
  • If an x-ray beam containing internal information derived from sample soft tissue is incident upon a Laue-case analyzer, the beam will subsequently split into a forwardly diffracted beam and a separate diffracted beam. Using these beams acquired simultaneously, a refraction-contrast computed tomography (CT) imaging system for biomedical use with lower radiation dose can be easily realized, and has a high depicting capability on the soft tissues compared with conventional x-ray CT based on absorption contrast principles. In this paper, we propose an imaging system using dark-field imaging for CT measurement based on a tandem system of Bragg- and Laue-case crystalsmore » with two two-dimensional detectors, along with a data-processing method to extract information on refraction from the measured entangled intensities by use of rocking curve fitting with polynomial functions. Reconstructed images of soft tissues are presented and described.« less