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2,125 results on '"Takahashi, Hiroaki"'

5. Developing a Machine Learning-Based Clinical Decision Support Tool for Uterine Tumor Imaging

Author

Wright, Darryl E., Gregory, Adriana V., Anaam, Deema, Yadollahi, Sepideh, Ramanathan, Sumana, Oyemade, Kafayat A., Alsibai, Reem, Holmes, Heather, Gottlich, Harrison, Browne, Cherie-Akilah G., Rassier, Sarah L. Cohen, Green, Isabel, Stewart, Elizabeth A., Takahashi, Hiroaki, Kim, Bohyun, Laughlin-Tommaso, Shannon, and Kline, Timothy L.

Subjects
Electrical Engineering and Systems Science - Image and Video Processing, Computer Science - Computer Vision and Pattern Recognition, Computer Science - Machine Learning, Quantitative Biology - Quantitative Methods
Abstract

Uterine leiomyosarcoma (LMS) is a rare but aggressive malignancy. On imaging, it is difficult to differentiate LMS from, for example, degenerated leiomyoma (LM), a prevalent but benign condition. We curated a data set of 115 axial T2-weighted MRI images from 110 patients (mean [range] age=45 [17-81] years) with UTs that included five different tumor types. These data were randomly split stratifying on tumor volume into training (n=85) and test sets (n=30). An independent second reader (reader 2) provided manual segmentations for all test set images. To automate segmentation, we applied nnU-Net and explored the effect of training set size on performance by randomly generating subsets with 25, 45, 65 and 85 training set images. We evaluated the ability of radiomic features to distinguish between types of UT individually and when combined through feature selection and machine learning. Using the entire training set the mean [95% CI] fibroid DSC was measured as 0.87 [0.59-1.00] and the agreement between the two readers was 0.89 [0.77-1.0] on the test set. When classifying degenerated LM from LMS we achieve a test set F1-score of 0.80. Classifying UTs based on radiomic features we identify classifiers achieving F1-scores of 0.53 [0.45, 0.61] and 0.80 [0.80, 0.80] on the test set for the benign versus malignant, and degenerated LM versus LMS tasks. We show that it is possible to develop an automated method for 3D segmentation of the uterus and UT that is close to human-level performance with fewer than 150 annotated images. For distinguishing UT types, while we train models that merit further investigation with additional data, reliable automatic differentiation of UTs remains a challenge.

Published
2023

9. Evaluating the usefulness of considering the size and morphological type of type B2 vessel area based on Japan Esophageal Society classification in estimating tumor invasion depth in superficial esophageal squamous cell carcinomas: study protocol for a prospective observational study (Japan BEES study)

Author

Yoshida, Masao, Mori, Keita, Urabe, Yuji, Hirasawa, Dai, Sasaki, Fumisato, Takeuchi, Manabu, Kadota, Tomohiro, Yoshio, Toshiyuki, Yoshinaga, Shigetaka, Kitamura, Yoko, Ohno, Kazuya, Ono, Yoichiro, Igarashi, Kimihiro, Takahashi, Hiroaki, and Ishihara, Ryu

Published
2024
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14. Side branch embolization before endovascular abdominal aortic aneurysm repair to prevent type II endoleak: A prospective multicenter study

Author

Gentsu, Tomoyuki, Yamaguchi, Masato, Sasaki, Koji, Kawasaki, Ryota, Horinouchi, Hiroki, Fukuda, Tetsuya, Miyamoto, Naokazu, Mori, Takeki, Sakamoto, Noriaki, Uotani, Kensuke, Taniguchi, Takanori, Koda, Yojiro, Yamanaka, Katsuhiro, Takahashi, Hiroaki, Okada, Kenji, Hayashi, Taro, Watanabe, Toshitaka, Nomura, Yoshikatsu, Matsushiro, Keigo, Ueshima, Eisuke, Okada, Takuya, Sugimoto, Koji, and Murakami, Takamichi

Published
2024
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19. Pre-emptive Aortic Side Branch Embolization during Endovascular Aneurysm Repair Using the Excluder Stent-Graft System: A Prospective Multicenter study

Author

Sasaki, Koji, Yamaguchi, Masato, Gentsu, Tomoyuki, Kawasaki, Ryota, Miyamoto, Naokazu, Uotani, Kensuke, Sakamoto, Noriaki, Fukuda, Tetsuya, Horinouchi, Hiroki, Taniguchi, Takanori, Mori, Takeki, Koda, Yojiro, Yamanaka, Katsuhiro, Takahashi, Hiroaki, Okada, Kenji, Watanabe, Toshitaka, Hayashi, Taro, Nomura, Yoshikatsu, Matsushiro, Keigo, Ueshima, Eisuke, Okada, Takuya, Sugimoto, Koji, and Murakami, Takamichi

Published
2024
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20. Solidified magma reservoir derived from active source seismic experiments in the Aira caldera, southern Kyushu, Japan

Author

Miyamachi, Hiroki, Yakiwara, Hiroshi, Kobayashi, Reiji, Hirano, Shuichiro, Kubo, Takeshi, Souda, Masakazu, Sakao, Kenyu, Unno, Naohiro, Matsushima, Takeshi, Uchida, Kazunari, Miyamachi, Rintaro, Isoda, Kenshin, Teguri, Yoshiko, Kamiya, Yoshinosuke, Triahadini, Agnis, Shimizu, Hiroshi, Katao, Hiroshi, Shibutani, Takuo, Tameguri, Takeshi, Yamashita, Yusuke, Miura, Tsutomu, Nakagawa, Jun, Yoneda, Itaru, Kato, Shinya, Takishita, Kosei, Nakai, Kazuho, Maeda, Yuta, Watanabe, Toshiki, Horikawa, Shinichiro, Matsushiro, Kenjiro, Okuda, Takashi, Tsuji, Shuhei, Sogawa, Naoki, Hasegawa, Daima, Nakahigashi, Kazuo, Kurashimo, Eiji, Yamada, Tomoaki, Abe, Hideji, Ando, Miwako, Tanaka, Shinichi, Ikezawa, Satoshi, Iwasaki, Takaya, Shinohara, Masanao, Sato, Toshinori, Yamamoto, Mare, Azuma, Ryosuke, Hirahara, Satoshi, Nakayama, Takashi, Suzuki, Syuichi, Otomo, Shuhei, Hino, Ryota, Tsutsui, Tomoki, Inoue, Yusuke, Takei, Ryuichi, Tada, Yuya, Takahashi, Hiroaki, Murai, Yoshio, Aoyama, Hiroshi, Ohzono, Mako, Shiina, Takahiro, Takada, Masamitsu, Ichiyanagi, Masayoshi, Yamaguchi, Teruhiro, Ono, Natsuki, Saito, Kazuma, Ito, Chihiro, Susukida, Yuuki, Nakagaki, Tatsuya, Tanaka, Yasuhisa, and Akinaga, Yasuhiko

Published
2023
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21. Proton beam therapy for hepatocellular carcinoma with bile duct invasion

Author

Iizumi, Takashi, Okumura, Toshiyuki, Hasegawa, Naoyuki, Ishige, Kazunori, Fukuda, Kuniaki, Seo, Emiko, Makishima, Hirokazu, Niitsu, Hikaru, Takahashi, Mizuki, Sekino, Yuta, Takahashi, Hiroaki, Takizawa, Daichi, Oshiro, Yoshiko, Baba, Keiichiro, Murakami, Motohiro, Saito, Takashi, Numajiri, Haruko, Mizumoto, Masashi, Nakai, Kei, and Sakurai, Hideyuki

Published
2023
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30. Study of Nature of Corona in Narrow Line Seyfert 1 Galaxies

Author

Idogaki, Hiroshi H., Ohmura, Shunichi, Takahashi, Hiroaki, Kobayashi, Shogo B., Ueda, Yoshihiro, Terashima, Yuichi, Hayashida, Kiyoshi, Tanaka, Takaaki, Uchida, Hiroyuki, and Tsuru, Takeshi Go

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We study X-ray spectra of four Narrow Line Seyfert 1 galaxies (NLS1s), Mrk 110, SWIFT J2127.4+5654, IGR J16185-5928, and WKK 4438, using Suzaku and NuSTAR data. The spectra of the four sources are reproduced with a model consisting of a cutoff power law component, a reflection component, and a soft excess component. The photon indices of all the sources are found to be ~ 2. The cutoff energies are constrained to be ~ 40 keV for Mrk 110, SWIFT J2127.4+5654, and WKK 4438, whereas a lower limit of 155 keV is obtained for IGR J16185-5928. We find that the NLS1s in our sample have systematically softer spectra and lower cutoff energies than Broad Line Seyfert 1 galaxies reported in the literature. We also perform spectral fittings with a model in which the cutoff power law is replaced with the thermal Comptonization model in order to directly obtain the electron temperature of the corona (kTe). The fits give kTe ~ 10-20 keV for Mrk 110 and SWIFT J2127.4+5654, and lower limits of kTe > 18 keV for IGR J16185-5928 and kTe > 5 keV for WKK 4438. We divide the NuSTAR data of SWIFT J2127.4+5654 into three periods according to the flux. The spectral fits in the three periods hint that kTe is the lower in the higher flux period. The results of the four sources suggest a possible anti-correlation between kTe and the ratio of the luminosity of Compton up-scattered photons to the Eddington luminosity. The anti-correlation can be explained by a simple model in which electrons in the corona are cooled and heated through inverse Compton scattering and Coulomb collisions with protons, respectively., Comment: 13 pages, 10 figures, 8 tables, submitted to PASJ

Published
2018

38. Heterogeneous Feature Fusion Based Machine Learning on Shallow-Wide and Heterogeneous-Sparse Industrial Datasets

Author

Yang, Zijiang, Watari, Tetsushi, Ichigozaki, Daisuke, Mitsutoshi, Akita, Takahashi, Hiroaki, Suga, Yoshinori, Liao, Wei-keng, Choudhary, Alok, Agrawal, Ankit, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Del Bimbo, Alberto, editor, Cucchiara, Rita, editor, Sclaroff, Stan, editor, Farinella, Giovanni Maria, editor, Mei, Tao, editor, Bertini, Marco, editor, Escalante, Hugo Jair, editor, and Vezzani, Roberto, editor

Published
2021
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45. The ASTRO-H X-ray Astronomy Satellite

Author

Takahashi, Tadayuki, Mitsuda, Kazuhisa, Kelley, Richard, Aharonian, Felix, Akamatsu, Hiroki, Akimoto, Fumie, Allen, Steve, Anabuki, Naohisa, Angelini, Lorella, Arnaud, Keith, Asai, Makoto, Audard, Marc, Awaki, Hisamitsu, Azzarello, Philipp, Baluta, Chris, Bamba, Aya, Bando, Nobutaka, Bautz, Marshall, Bialas, Thomas, Blandford, Roger, Boyce, Kevin, Brenneman, Laura, Brown, Greg, Cackett, Edward, Canavan, Edgar, Chernyakova, Maria, Chiao, Meng, Coppi, Paolo, Costantini, Elisa, de Plaa, Jelle, Herder, Jan-Willem den, DiPirro, Michael, Done, Chris, Dotani, Tadayasu, Doty, John, Ebisawa, Ken, Eckart, Megan, Enoto, Teruaki, Ezoe, Yuichiro, Fabian, Andrew, Ferrigno, Carlo, Foster, Adam, Fujimoto, Ryuichi, Fukazawa, Yasushi, Funk, Stefan, Furuzawa, Akihiro, Galeazzi, Massimiliano, Gallo, Luigi, Gandhi, Poshak, Gilmore, Kirk, Guainazzi, Matteo, Haas, Daniel, Haba, Yoshito, Hamaguchi, Kenji, Harayama, Atsushi, Hatsukade, Isamu, Hayashi, Takayuki, Hayashi, Katsuhiro, Hayashida, Kiyoshi, Hiraga, Junko, Hirose, Kazuyuki, Hornschemeier, Ann, Hoshino, Akio, Hughes, John, Hwang, Una, Iizuka, Ryo, Inoue, Yoshiyuki, Ishibashi, Kazunori, Ishida, Manabu, Ishikawa, Kumi, Ishimura, Kosei, Ishisaki, Yoshitaka, Ito, Masayuki, Iwata, Naoko, Iyomoto, Naoko, Jewell, Chris, Kaastra, Jelle, Kallman, Timothy, Kamae, Tuneyoshi, Kataoka, Jun, Katsuda, Satoru, Katsuta, Junichiro, Kawaharada, Madoka, Kawai, Nobuyuki, Kawano, Taro, Kawasaki, Shigeo, Khangulyan, Dmitry, Kilbourne, Caroline, Kimball, Mark, Kimura, Masashi, Kitamoto, Shunji, Kitayama, Tetsu, Kohmura, Takayoshi, Kokubun, Motohide, Konami, Saori, Kosaka, Tatsuro, Koujelev, Alex, Koyama, Katsuji, Krimm, Hans, Kubota, Aya, Kunieda, Hideyo, LaMassa, Stephanie, Laurent, Philippe, Lebrun, Franccois, Leutenegger, Maurice, Limousin, Olivier, Loewenstein, Michael, Long, Knox, Lumb, David, Madejski, Grzegorz, Maeda, Yoshitomo, Makishima, Kazuo, Markevitch, Maxim, Masters, Candace, Matsumoto, Hironori, Matsushita, Kyoko, McCammon, Dan, Mcguinness, Daniel, McNamara, Brian, Miko, Joseph, Miller, Jon, Miller, Eric, Mineshige, Shin, Minesugi, Kenji, Mitsuishi, Ikuyuki, Miyazawa, Takuya, Mizuno, Tsunefumi, Mori, Koji, Mori, Hideyuki, Moroso, Franco, Muench, Theodore, Mukai, Koji, Murakami, Hiroshi, Murakami, Toshio, Mushotzky, Richard, Nagano, Housei, Nagino, Ryo, Nakagawa, Takao, Nakajima, Hiroshi, Nakamori, Takeshi, Nakashima, Shinya, Nakazawa, Kazuhiro, Namba, Yoshiharu, Natsukari, Chikara, Nishioka, Yusuke, Nobukawa, Masayoshi, Noda, Hirofumi, Nomachi, Masaharu, Dell, Steve O', Odaka, Hirokazu, Ogawa, Hiroyuki, Ogawa, Mina, Ogi, Keiji, Ohashi, Takaya, Ohno, Masanori, Ohta, Masayuki, Okajima, Takashi, Okamoto, Atsushi, Okazaki, Tsuyoshi, Ota, Naomi, Ozaki, Masanobu, Paerels, Frits, Paltani, St'ephane, Parmar, Arvind, Petre, Robert, Pinto, Ciro, Pohl, Martin, Pontius, James, Porter, F. Scott, Pottschmidt, Katja, Ramsey, Brian, Reis, Rubens, Reynolds, Christopher, Ricci, Claudio, Russell, Helen, Safi-Harb, Samar, Saito, Shinya, Sakai, Shin-ichiro, Sameshima, Hiroaki, Sato, Goro, Sato, Yoichi, Sato, Kosuke, Sato, Rie, Sawada, Makoto, Serlemitsos, Peter, Seta, Hiromi, Shibano, Yasuko, Shida, Maki, Shimada, Takanobu, Shinozaki, Keisuke, Shirron, Peter, Simionescu, Aurora, Simmons, Cynthia, Smith, Randall, Sneiderman, Gary, Soong, Yang, Stawarz, Lukasz, Sugawara, Yasuharu, Sugita, Hiroyuki, Sugita, Satoshi, Szymkowiak, Andrew, Tajima, Hiroyasu, Takahashi, Hiromitsu, Takahashi, Hiroaki, Takeda, Shin-ichiro, Takei, Yoh, Tamagawa, Toru, Tamura, Takayuki, Tamura, Keisuke, Tanaka, Takaaki, Tanaka, Yasuo, Tanaka, Yasuyuki, Tashiro, Makoto, Tawara, Yuzuru, Terada, Yukikatsu, Terashima, Yuichi, Tombesi, Francesco, Tomida, Hiroshi, Tsuboi, Yohko, Tsujimoto, Masahiro, Tsunemi, Hiroshi, Tsuru, Takeshi, Uchida, Hiroyuki, Uchiyama, Yasunobu, Uchiyama, Hideki, Ueda, Yoshihiro, Ueda, Shutaro, Ueno, Shiro, Uno, Shinichiro, Urry, Meg, Ursino, Eugenio, de Vries, Cor, Wada, Atsushi, Watanabe, Shin, Watanabe, Tomomi, Werner, Norbert, White, Nicholas, Wilkins, Dan, Yamada, Takahiro, Yamada, Shinya, Yamaguchi, Hiroya, Yamaoka, Kazutaka, Yamasaki, Noriko, Yamauchi, Makoto, Yamauchi, Shigeo, Yaqoob, Tahir, Yatsu, Yoichi, Yonetoku, Daisuke, Yoshida, Atsumasa, Yuasa, Takayuki, Zhuravleva, Irina, Zoghbi, Abderahmen, and ZuHone, John

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions developed by the Institute of Space and Astronautical Science (ISAS), with a planned launch in 2015. The ASTRO-H mission is equipped with a suite of sensitive instruments with the highest energy resolution ever achieved at E > 3 keV and a wide energy range spanning four decades in energy from soft X-rays to gamma-rays. The simultaneous broad band pass, coupled with the high spectral resolution of Delta E < 7 eV of the micro-calorimeter, will enable a wide variety of important science themes to be pursued. ASTRO-H is expected to provide breakthrough results in scientific areas as diverse as the large-scale structure of the Universe and its evolution, the behavior of matter in the gravitational strong field regime, the physical conditions in sites of cosmic-ray acceleration, and the distribution of dark matter in galaxy clusters at different redshifts., Comment: 24 pages, 18 figures, Proceedings of the SPIE Astronomical Instrumentation "Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray"

Published
2014
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