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Scintillation and photoluminescence properties of Prdoped CaHfO3 crystals
Hiroyuki Fukushima,Daisuke Nakauchi,Noriaki Kawaguchi,Takayuki Yanagida 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3
Pr-doped CaHfO3 bulk crystals were synthesized by the floating zone method, and the luminescence properties wereinvestigated. We confirmed that all the samples have a single phase of CaHO3 by XRD measurement. The undoped sampleindicate a broad emission around 440 nm and fast decay time constant due to the host while the Pr-doped samples show sharppeaks and slow decay time constants due to the 4f-4f transitions of Pr3+. By Pr-doping, the afterglow level became worse thanthat of the undoped one while the dense Pr-doping can suppress the afterglow.
Masaya Kawaguchi,Hiroki Kato,Hiroyuki Tomita,Akira Hara,Natsuko Suzui,Tatsuhiko Miyazaki,Kanako Matsuyama,Mariko Seishima,Masayuki Matsuo 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.3
Objective: This study aimed to evaluate the efficacy of magnetic resonance (MR) imaging in differentiating between cutaneous basal cell carcinoma (cBCC) and cutaneous squamous cell carcinoma (cSCC) in the head and neck region. Materials and Methods: Among patients with cutaneous head and neck cancers, 14 with primary cBCCs and 15 with primary cSCCs with a histologic tumor height of ≥ 4 mm underwent MR examinations; the findings were then examined for correlations. Results: cBCCs (71%) occurred more frequently on the nose than cSCCs (13%) (p < 0.01). The maximum diameter (23.5 ± 7.2 mm vs. 12.7 ± 4.5 mm; p < 0.01) and diameter-to-height ratio (2.8 ± 0.9 vs. 1.7 ± 0.4; p < 0.01) were significantly greater in cSCCs than in cBCCs. Superficial ulcer formation (67% vs. 21%; p < 0.05), protrusion into the subcutaneous tissue (60% vs. 21%; p < 0.05), ill-demarcated deep tumor margins (60% vs. 7%; p < 0.01), and peritumoral fat stranding (93% vs. 7%; p < 0.01) were more frequently observed in cSCCs than in cBCCs. Intratumoral T2-hyperintense foci (57% vs. 13%; p < 0.05) were more frequently observed in cBCCs than in cSCCs. Conclusion: cBCCs predominantly occurred on the nose with intratumoral T2-hyperintense foci, whereas cSCCs predominantly exhibited a flattened configuration, superficial ulcer formation, protrusion into the subcutaneous tissue, ill-demarcated deep tumor margin, and peritumoral fat stranding.
Hironori Koga,Hideki Iwamoto,Hiroyuki Suzuki,Shigeo Shimose,Masahito Nakano,Takumi Kawaguchi 대한간학회 2023 Clinical and Molecular Hepatology(대한간학회지) Vol.29 No.2
Striking advances in systemic therapy for unresectable advanced hepatocellular carcinoma (HCC) have improved the average prognosis of patients with HCC. As a result, the guidelines for the treatment of HCC have changed significantly. However, various issues have emerged in clinical practice. First, there is no established biomarker that can predict response to systemic therapy. Second, there is no established treatment regimen after primary systemic therapy, including combined immunotherapy. Third, there is no established treatment regimen for intermediate-stage HCC. These points make the current guidelines ambiguous. In this review, we present the Japanese guidelines for the diagnosis and treatment of HCC based on the latest evidence; introduce various efforts mainly in Japanese real-life practice to update these guidelines; and present our perspectives on future guidelines.