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18 results on '"Hamasaki, Nozomi"'

7. Effect of hybrid of compressed sensing and parallel imaging on the quantitative values measured by 3D quantitative synthetic MRI: A phantom study

Author

Murata, Syo, primary, Hagiwara, Akifumi, additional, Fujita, Shohei, additional, Haruyama, Takuya, additional, Kato, Shimpei, additional, Andica, Christina, additional, Kamagata, Koji, additional, Goto, Masami, additional, Hori, Masaaki, additional, Yoneyama, Masami, additional, Hamasaki, Nozomi, additional, Hoshito, Haruyoshi, additional, and Aoki, Shigeki, additional

Published
2021
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9. SMS-TSE sequenceとConventional TSE sequenceのMT効果の比較・検討

Author

Murata, Syo, Murata, Katsutoshi, Hori, Masaaki, Kamagata, Koji, Suzuki, Michimasa, K, Kumamaru Kanako, Irie, Ryusuke, Sato, Shuji, Hamasaki, Nozomi, Fukunaga, Issei, Tsuruta, Kohei, Uchioke, Saori, Hoshito, Haruyoshi, and Aoki, Shigeki

Abstract

Multi-band sequence can obtain multi slices simultaneously. Relation between simultaneous multi-slice (SMS) turbo spin echo and MT effect were investigated by changing slice excitation time interval. As a result, SMS showed larger MT effect than conventional technique., 第45回日本磁気共鳴医学会大会

Published
2017

10. Application of Quantitative Microstructural MR Imaging with Atlas-based Analysis for the Spinal Cord in Cervical Spondylotic Myelopathy

Author

Hori, Masaaki, primary, Hagiwara, Akifumi, additional, Fukunaga, Issei, additional, Ueda, Ryo, additional, Kamiya, Kouhei, additional, Suzuki, Yuichi, additional, Liu, Wei, additional, Murata, Katsutoshi, additional, Takamura, Tomohiro, additional, Hamasaki, Nozomi, additional, Irie, Ryusuke, additional, Kamagata, Koji, additional, Kumamaru, Kanako Kunishima, additional, Suzuki, Michimasa, additional, and Aoki, Shigeki, additional

Published
2018
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11. Spatial Restriction within Intracranial Epidermoid Cysts Observed Using Short Diffusion-time Diffusion-weighted Imaging

Author

Andica, Christina, primary, Hori, Masaaki, additional, Kamiya, Kouhei, additional, Koshino, Saori, additional, Hagiwara, Akifumi, additional, Kamagata, Koji, additional, Fukunaga, Issei, additional, Hamasaki, Nozomi, additional, Suzuki, Michimasa, additional, Feiweier, Thorsten, additional, Murata, Katsutoshi, additional, Arakawa, Atsushi, additional, Kondo, Akihide, additional, Akiyama, Osamu, additional, and Aoki, Shigeki, additional

Published
2018
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12. Alterations of the optic pathway between unilateral and bilateral optic nerve damage in multiple sclerosis as revealed by the combined use of advanced diffusion kurtosis imaging and visual evoked potentials

Author

Takemura, Mariko Yoshida, primary, Hori, Masaaki, additional, Yokoyama, Kazumasa, additional, Hamasaki, Nozomi, additional, Suzuki, Michimasa, additional, Kamagata, Koji, additional, Kamiya, Kouhei, additional, Suzuki, Yuriko, additional, Kyogoku, Shinsuke, additional, Masutani, Yoshitaka, additional, Hattori, Nobutaka, additional, and Aoki, Shigeki, additional

Published
2017
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13. Myocardial triglyceride content in patients with left ventricular hypertrophy: comparison between hypertensive heart disease and hypertrophic cardiomyopathy

Author

Sai, Eiryu, primary, Shimada, Kazunori, additional, Yokoyama, Takayuki, additional, Hiki, Makoto, additional, Sato, Shuji, additional, Hamasaki, Nozomi, additional, Maruyama, Masaki, additional, Morimoto, Ryoko, additional, Miyazaki, Tetsuro, additional, Fujimoto, Shinichiro, additional, Tamura, Yoshifumi, additional, Aoki, Shigeki, additional, Watada, Hirotaka, additional, Kawamori, Ryuzo, additional, and Daida, Hiroyuki, additional

Published
2016
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14. Contrast-enhanced synthetic MRI for the detection of brain metastases

Author

Hagiwara, Akifumi, primary, Hori, Masaaki, additional, Suzuki, Michimasa, additional, Andica, Christina, additional, Nakazawa, Misaki, additional, Tsuruta, Kouhei, additional, Takano, Nao, additional, Sato, Shuji, additional, Hamasaki, Nozomi, additional, Yoshida, Mariko, additional, Kumamaru, Kanako Kunishima, additional, Ohtomo, Kuni, additional, and Aoki, Shigeki, additional

Published
2016
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15. Slice-accelerated gradient-echo echo planar imaging dynamic susceptibility contrast-enhanced MRI with blipped CAIPI: effect of increasing temporal resolution.

Author

Takamura, Tomohiro, Hori, Masaaki, Kamagata, Koji, Kumamaru, Kanako K., Irie, Ryusuke, Hagiwara, Akifumi, Hamasaki, Nozomi, and Aoki, Shigeki

Abstract

Purpose: To assess the influence of high temporal resolution on the perfusion measurements and image quality of perfusion maps, by applying simultaneous-multi-slice acquisition (SMS) dynamic susceptibility contrast-enhanced (DSC) magnetic resonance imaging (MRI).Materials and Methods: DSC-MRI data using SMS gradient-echo echo planar imaging sequences in 10 subjects with no intracranial abnormalities were retrospectively analyzed. Three additional data sets with temporal resolution of 1.0, 1.5, and 2.0 s were created from the raw data sets of 0.5 s. Cerebral blood flow (CBF), cerebral blood volume, mean transit time (MTT), time to peak (TTP), and time to maximum tissue residue function (T max) measurements were performed, as was visual perfusion map analysis. The perfusion parameter for temporal resolution of 0.5 s (reference) was compared with each synthesized perfusion parameter.Results: CBF, MTT, and TTP values at temporal resolutions of 1.5 and 2.0 s differed significantly from the reference. The image quality of MTT, TTP, and T max maps deteriorated with decreasing temporal resolution.Conclusion: The temporal resolution of DSC-MRI influences perfusion parameters and SMS DSC-MRI provides better image quality for MTT, TTP, and T max maps. [ABSTRACT FROM AUTHOR]

Published
2018
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16. Multiple sclerosis: Benefits of q-space imaging in evaluation of normal-appearing and periplaque white matter

Author

Hori, Masaaki, primary, Yoshida, Mariko, additional, Yokoyama, Kazumasa, additional, Kamagata, Koji, additional, Kumagai, Fumitaka, additional, Fukunaga, Issei, additional, Kamiya, Kouhei, additional, Suzuki, Michimasa, additional, Masutani, Yoshitaka, additional, Hamasaki, Nozomi, additional, Suzuki, Yuriko, additional, Kyogoku, Shinsuke, additional, Hattori, Nobutaka, additional, and Aoki, Shigeki, additional

Published
2014
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18. [Assessment of the utility of digital subtraction in lacrimal passage contrasting].

Author

Sato K, Doryo K, Yamamoto H, Kimura S, Takase M, Okuyama Y, Hamasaki N, Takahashi M, and Kumagai Y

Subjects
Area Under Curve, Head diagnostic imaging, Humans, Lens, Crystalline radiation effects, ROC Curve, Radiation Dosage, Radiation Injuries prevention & control, Signal Processing, Computer-Assisted, Tomography, X-Ray Computed, Lacrimal Apparatus diagnostic imaging
Abstract

The utility of lacrimal passage contrasting by a digital subtraction system (DS system) was assessed in comparison with a computed radiography system (CR system) by means of simulating the exposure dose of a patient's crystalline lens and measuring the image contrast of both systems. The exposure dose of the patient's crystalline lens in the DS system was an average of 45.8 mGy, which was 41.6 times higher than that of the CR system. Therefore, care must be taken to reduce the exposure dose of the crystalline lens because it is necessary to reduce the probability of radiation injuries such as cataracts. The average of the image contrast of the DS system at the lacrimal passage to other parts of the head radiograph was lower than that of the CR system, but the standard deviation of the DS system was 0.16, a value that was almost constant because the shadow of obstacles such as the facial bone was almost completely removed, and image contrast was improved. The area under the curve (AUC) of the DS and CR systems as determined by means of receiver operating characteristic (ROC) analysis by ten radiological technologists were 0.869+/-0.066 and 0.746+/-0.125, respectively, and statistical significance was shown for both systems, although the detectability of the DS system was superior to that of the CR system (p<0.05). Therefore, we concluded that the DS system was a useful radiographic technique for lacrimal passage contrasting, and its use in patients is predicted to increase in the future.

Published
2007
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