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. |
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| 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] |
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| Database: | Engineering Source |
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| 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] |
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| ISSN: | 19961944 |
| DOI: | 10.3390/ma19091834 |
