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Development of Optical-Guiding Scintillators with Ultrafine (~12 μm) Uniform Scintillator Cores for High-Resolution X-Ray Imaging.

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Title: Development of Optical-Guiding Scintillators with Ultrafine (~12 μm) Uniform Scintillator Cores for High-Resolution X-Ray Imaging.
Authors: Kamada, Kei1,2 (AUTHOR) kamada@imr.tohoku.ac.jp, Yoshino, Masao1,2,3 (AUTHOR), Nakata, Yuhei3,4 (AUTHOR), Kudo, Testuo2,4 (AUTHOR), Usuki, Yoshiyuki1,2 (AUTHOR), Kutsuzawa, Naoko2 (AUTHOR), Kim, Kyoung Jin1,2,3 (AUTHOR), Murakami, Rikito2,3,4 (AUTHOR), Ishizawa, Satoshi2,3 (AUTHOR), Yoshikawa, Akira1,2,3 (AUTHOR)
Source: Materials (1996-1944). May2026, Vol. 19 Issue 9, p1834. 13p.
Subjects: Scintillators, Hollow fibers, Image quality in imaging systems, X-ray imaging, Spatial resolution, Radioluminescence
Abstract: Highlights: The hollow-fiber process enabled bundled OCS with ultrafine (~12 μm) uniform cores. Tl:CCI melt infiltration achieved defect-suppressed core formation. Bundled OCS outperformed Tl:CsI in spatial resolution and image contrast. Optical-guiding architecture reduced lateral light scattering effects. We report the development of bundled optical-guiding crystal scintillators (OCSs) with ultrafine and uniform scintillator cores (~12 μm) for high-resolution X-ray imaging. Conventional OCS fabrication using iodide scintillators often suffers from iodine volatilization, bubble formation, and core discontinuities, which limit structural uniformity and device reliability. To address these limitations, a hollow-fiber-based fabrication strategy was introduced. Hollow glass fibers were first bundled and drawn without scintillator materials, followed by capillary infiltration of a Tl-doped Cs3Cu2I5 (Tl: CCI) melt. This approach enabled the stable formation of densely packed bundled OCS structures with uniform core diameters of 10–12 μm while suppressing volatilization-induced defects. Radioluminescence measurements confirmed a broad emission peak at ~442 nm, consistent with Tl:CCI scintillation. X-ray imaging experiments demonstrated superior spatial resolution and image contrast compared with a commercial CsI:Tl columnar scintillator. The bundled OCS exhibited an average contrast transfer function (CTF) of 30.7% at ~10 lp/mm, exceeding the reference value. These results demonstrate that the hollow-fiber architecture provides an effective route toward scalable ultrafine-core scintillators and highlight the potential of Tl:CCI-filled OCSs for next-generation high-resolution X-ray imaging. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
  Group: Ti
  Data: Development of Optical-Guiding Scintillators with Ultrafine (~12 μm) Uniform Scintillator Cores for High-Resolution X-Ray Imaging.
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  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Kamada%2C+Kei%22">Kamada, Kei</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> kamada@imr.tohoku.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Yoshino%2C+Masao%22">Yoshino, Masao</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nakata%2C+Yuhei%22">Nakata, Yuhei</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kudo%2C+Testuo%22">Kudo, Testuo</searchLink><relatesTo>2,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Usuki%2C+Yoshiyuki%22">Usuki, Yoshiyuki</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kutsuzawa%2C+Naoko%22">Kutsuzawa, Naoko</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kim%2C+Kyoung+Jin%22">Kim, Kyoung Jin</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Murakami%2C+Rikito%22">Murakami, Rikito</searchLink><relatesTo>2,3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ishizawa%2C+Satoshi%22">Ishizawa, Satoshi</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yoshikawa%2C+Akira%22">Yoshikawa, Akira</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. May2026, Vol. 19 Issue 9, p1834. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Scintillators%22">Scintillators</searchLink><br /><searchLink fieldCode="DE" term="%22Hollow+fibers%22">Hollow fibers</searchLink><br /><searchLink fieldCode="DE" term="%22Image+quality+in+imaging+systems%22">Image quality in imaging systems</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+imaging%22">X-ray imaging</searchLink><br /><searchLink fieldCode="DE" term="%22Spatial+resolution%22">Spatial resolution</searchLink><br /><searchLink fieldCode="DE" term="%22Radioluminescence%22">Radioluminescence</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Highlights: The hollow-fiber process enabled bundled OCS with ultrafine (~12 μm) uniform cores. Tl:CCI melt infiltration achieved defect-suppressed core formation. Bundled OCS outperformed Tl:CsI in spatial resolution and image contrast. Optical-guiding architecture reduced lateral light scattering effects. We report the development of bundled optical-guiding crystal scintillators (OCSs) with ultrafine and uniform scintillator cores (~12 μm) for high-resolution X-ray imaging. Conventional OCS fabrication using iodide scintillators often suffers from iodine volatilization, bubble formation, and core discontinuities, which limit structural uniformity and device reliability. To address these limitations, a hollow-fiber-based fabrication strategy was introduced. Hollow glass fibers were first bundled and drawn without scintillator materials, followed by capillary infiltration of a Tl-doped Cs3Cu2I5 (Tl: CCI) melt. This approach enabled the stable formation of densely packed bundled OCS structures with uniform core diameters of 10–12 μm while suppressing volatilization-induced defects. Radioluminescence measurements confirmed a broad emission peak at ~442 nm, consistent with Tl:CCI scintillation. X-ray imaging experiments demonstrated superior spatial resolution and image contrast compared with a commercial CsI:Tl columnar scintillator. The bundled OCS exhibited an average contrast transfer function (CTF) of 30.7% at ~10 lp/mm, exceeding the reference value. These results demonstrate that the hollow-fiber architecture provides an effective route toward scalable ultrafine-core scintillators and highlight the potential of Tl:CCI-filled OCSs for next-generation high-resolution X-ray imaging. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.3390/ma19091834
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 13
        StartPage: 1834
    Subjects:
      – SubjectFull: Scintillators
        Type: general
      – SubjectFull: Hollow fibers
        Type: general
      – SubjectFull: Image quality in imaging systems
        Type: general
      – SubjectFull: X-ray imaging
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      – SubjectFull: Spatial resolution
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      – SubjectFull: Radioluminescence
        Type: general
    Titles:
      – TitleFull: Development of Optical-Guiding Scintillators with Ultrafine (~12 μm) Uniform Scintillator Cores for High-Resolution X-Ray Imaging.
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              Text: May2026
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              Y: 2026
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