Search Results - "Koyama, Shuji"

Luminescence imaging of water during irradiation of X-ray photons lower energy than Cerenkov- light threshold by Yamamoto, Seiichi, Koyama, Shuji, Komori, Masataka, Toshito, Toshiyuki

“…Luminescence imaging of water using X-ray photon irradiation at energy lower than maximum energy of ~200keV is thought to be impossible because the secondary…”
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Luminescence imaging of water during alpha particle irradiation by Yamamoto, Seiichi, Komori, Masataka, Koyama, Shuji, Toshito, Toshiyuki

“…The luminescence imaging of water using the alpha particle irradiation of several MeV energy range is thought to be impossible because this alpha particle…”
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Luminescence imaging of water during carbon-ion irradiation for range estimation by Yamamoto, Seiichi, Komori, Masataka, Akagi, Takashi, Yamashita, Tomohiro, Koyama, Shuji, Morishita, Yuki, Sekihara, Eri, Toshito, Toshiyuki

“…Purpose: The authors previously reported successful luminescence imaging of water during proton irradiation and its application to range estimation. However,…”
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Reorganization of brain networks and its association with general cognitive performance over the adult lifespan by Bagarinao, Epifanio, Watanabe, Hirohisa, Maesawa, Satoshi, Mori, Daisuke, Hara, Kazuhiro, Kawabata, Kazuya, Yoneyama, Noritaka, Ohdake, Reiko, Imai, Kazunori, Masuda, Michihito, Yokoi, Takamasa, Ogura, Aya, Taoka, Toshiaki, Koyama, Shuji, Tanabe, Hiroki C., Katsuno, Masahisa, Wakabayashi, Toshihiko, Kuzuya, Masafumi, Ozaki, Norio, Hoshiyama, Minoru, Isoda, Haruo, Naganawa, Shinji, Sobue, Gen

“…Healthy aging is associated with structural and functional changes in the brain even in individuals who are free of neurodegenerative diseases. Using resting…”
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Functional connector hubs in the cerebellum by Kawabata, Kazuya, Bagarinao, Epifanio, Watanabe, Hirohisa, Maesawa, Satoshi, Mori, Daisuke, Hara, Kazuhiro, Ohdake, Reiko, Masuda, Michihito, Ogura, Aya, Kato, Toshiyasu, Koyama, Shuji, Katsuno, Masahisa, Wakabayashi, Toshihiko, Kuzuya, Masafumi, Hoshiyama, Minoru, Isoda, Haruo, Naganawa, Shinji, Ozaki, Norio, Sobue, Gen

“…Accumulating evidence from anatomical and neuroimaging studies suggests that the cerebellum is engaged in a variety of motor and cognitive tasks. Given its…”
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Identifying the brain's connector hubs at the voxel level using functional connectivity overlap ratio by Bagarinao, Epifanio, Watanabe, Hirohisa, Maesawa, Satoshi, Mori, Daisuke, Hara, Kazuhiro, Kawabata, Kazuya, Ohdake, Reiko, Masuda, Michihito, Ogura, Aya, Kato, Toshiyasu, Koyama, Shuji, Katsuno, Masahisa, Wakabayashi, Toshihiko, Kuzuya, Masafumi, Hoshiyama, Minoru, Isoda, Haruo, Naganawa, Shinji, Ozaki, Norio, Sobue, Gen

“…Neuroimaging studies have shown that the brain is functionally organized into several large-scale brain networks. Within these networks are regions that are…”
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New weighting factor of weighted CTDI equation for PMMA phantom diameter from 8 to 40 cm: A Monte Carlo study by Haba, Tomonobu, Koyama, Shuji, Kinomura, Yutaka, Ida, Yoshihiro, Kobayashi, Masanao

“…Purpose The weighted computed tomography dose index (CTDIw) uses measured CTDI values at the center and periphery of a cylindrical phantom. The CTDIw value is…”
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A Comparison and Evaluation of Two Commercially Available Metal Artifact Reduction Applications by Osawa, Mitsuharu, Fujita, Naotoshi, Koyama, Shuji, Kaneda, Naoki, Miyachi, Shigeru

“…Objective: The angiography systems A (A) and B (B), both incorporated at our hospital, are equipped with metal artifact reduction (MAR) applications. In…”
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Changes in white matter fiber density and morphology across the adult lifespan: A cross‐sectional fixel‐based analysis by Choy, Shao Wei, Bagarinao, Epifanio, Watanabe, Hirohisa, Ho, Eric Tatt Wei, Maesawa, Satoshi, Mori, Daisuke, Hara, Kazuhiro, Kawabata, Kazuya, Yoneyama, Noritaka, Ohdake, Reiko, Imai, Kazunori, Masuda, Michihito, Yokoi, Takamasa, Ogura, Aya, Taoka, Toshiaki, Koyama, Shuji, Tanabe, Hiroki C., Katsuno, Masahisa, Wakabayashi, Toshihiko, Kuzuya, Masafumi, Hoshiyama, Minoru, Isoda, Haruo, Naganawa, Shinji, Ozaki, Norio, Sobue, Gen

“…White matter (WM) fiber bundles change dynamically with age. These changes could be driven by alterations in axonal diameter, axonal density, and myelin…”
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Automatic measurement of mandibular cortical bone width on cone-beam computed tomography images by Mizukuchi, Takashi, Naitoh, Munetaka, Hishikawa, Toshimitsu, Nishida, Satoshi, Mitani, Akio, Ariji, Eiichiro, Koyama, Shuji

“…Objective The computed tomography cortical index (CTCI), computed tomography mandibular index (CTMI), and computed tomography index (inferior) [CTI(I)] are…”
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Stability and linearity of luminescence imaging of water during irradiation of proton-beams and X-ray photons lower energy than the Cerenkov light threshold by Yamamoto, Seiichi, Koyama, Shuji, Yabe, Takuya, Komori, Masataka, Tada, Junki, Ito, Shiori, Toshito, Toshiyuki, Hirata, Yuho, Watanabe, Kenichi

“…Luminescence of water during irradiations of proton-beams or X-ray photons lower energy than the Cerenkov-light threshold is promising for range estimation or…”
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A new cone-beam computed tomography dosimetry method providing optimal measurement positions: A Monte Carlo study by Haba, Tomonobu, Yasui, Keisuke, Saito, Yasunori, Kobayashi, Masanao, Koyama, Shuji

“…•We devised a new dose metric (f(0)CBw) for cone-beam CT dosimetry.•The f(0)CBw method adopted new measurement positions of a cylindrical phantom.•The f(0)CBw…”
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Reproducibility of functional connectivity metrics estimated from resting-state functional MRI with differences in days, coils, and global signal regression by Kato, Sanae, Bagarinao, Epifanio, Isoda, Haruo, Koyama, Shuji, Watanabe, Hirohisa, Maesawa, Satoshi, Hara, Kazuhiro, Katsuno, Masahisa, Naganawa, Shinji, Ozaki, Norio, Sobue, Gen

“…In multisite studies, differences in imaging acquisition systems could affect the reproducibility of the results when examining changes in brain function using…”
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Size-specific dose estimates for various weighting factors of CTDI equation by Haba, Tomonobu, Kobayashi, Masanao, Koyama, Shuji

“…Size-specific dose estimate (SSDE) was proposed by the American Association of Physicists in Medicine (AAPM) Task Group 204 to consider the effect of patient…”
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Effects of Head Motion on the Evaluation of Age-related Brain Network Changes Using Resting State Functional MRI by Kato, Sanae, Bagarinao, Epifanio, Isoda, Haruo, Koyama, Shuji, Watanabe, Hirohisa, Maesawa, Satoshi, Mori, Daisuke, Hara, Kazuhiro, Katsuno, Masahisa, Hoshiyama, Minoru, Naganawa, Shinji, Ozaki, Norio, Sobue, Gen

“…Purpose: The estimation of functional connectivity (FC) measures using resting state functional MRI (fMRI) is often affected by head motion during functional…”
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Distribution of scatter radiation by C-arm cone-beam computed tomography in angiographic suite: measurement of doses and effectiveness of protection devices by Yamaji, Mayako, Ishiguchi, Tsuneo, Koyama, Shuji, Ikeda, Shuji, Kitagawa, Akira, Hagihara, Makiyo, Itoh, Yuji, Nakamura, Masaru, Ota, Toyohiro, Suzuki, Kojiro

“…Distribution of radiation by C-arm cone-beam computed tomography (CBCT) in the angiographic suite and effectiveness of protection devices were assessed. CBCT…”
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Automatic Remasking of Digital Subtraction Angiography Images in Pulmonary Angiography by Mizukuchi, Takashi, Uemura, Takeshi, Kondo, Satoru, Abe, Shinji, Adachi, Shiro, Okumura, Naoki, Kondo, Takahisa, Koyama, Shuji

“…In pulmonary angiography, the heartbeat creates artifacts that hinder extraction of blood vessel images in digital subtraction angiography. Remasking according…”
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Luminescence imaging of biological subjects during X-ray irradiations lower energy than Cerenkov-light threshold by Yamamoto, Seiichi, Koyama, Shuji, Yamauchi-Kawaura, Chiyo, Komori, Masataka

“…It is commonly thought that UV or visible-light luminescence imaging of biological subjects during X-ray irradiation at the energy below 120 keV is impossible…”
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Aging Impacts the Overall Connectivity Strength of Regions Critical for Information Transfer Among Brain Networks by Bagarinao, Epifanio, Watanabe, Hirohisa, Maesawa, Satoshi, Mori, Daisuke, Hara, Kazuhiro, Kawabata, Kazuya, Yoneyama, Noritaka, Ohdake, Reiko, Imai, Kazunori, Masuda, Michihito, Yokoi, Takamasa, Ogura, Aya, Taoka, Toshiaki, Koyama, Shuji, Tanabe, Hiroki C., Katsuno, Masahisa, Wakabayashi, Toshihiko, Kuzuya, Masafumi, Hoshiyama, Minoru, Isoda, Haruo, Naganawa, Shinji, Ozaki, Norio, Sobue, Gen

“…Recent studies have demonstrated that connector hubs, regions considered critical for the flow of information across neural systems, are mostly involved in…”
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Bridging large-scale cortical networks: Integrative and function-specific hubs in the thalamus by Kawabata, Kazuya, Bagarinao, Epifanio, Watanabe, Hirohisa, Maesawa, Satoshi, Mori, Daisuke, Hara, Kazuhiro, Ohdake, Reiko, Masuda, Michihito, Ogura, Aya, Kato, Toshiyasu, Koyama, Shuji, Katsuno, Masahisa, Wakabayashi, Toshihiko, Kuzuya, Masafumi, Hoshiyama, Minoru, Isoda, Haruo, Naganawa, Shinji, Ozaki, Norio, Sobue, Gen

“…The thalamus is critical for the brain's integrative hub functions; however, the localization and characterization of the different thalamic hubs remain…”
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