Search Results - "Takei, Naoyuki"

Estimation of Cerebral Blood Flow and Arterial Transit Time From Multi‐Delay Arterial Spin Labeling MRI Using a Simulation‐Based Supervised Deep Neural Network by Ishida, Shota, Isozaki, Makoto, Fujiwara, Yasuhiro, Takei, Naoyuki, Kanamoto, Masayuki, Kimura, Hirohiko, Tsujikawa, Tetsuya

“…Background An inherently poor signal‐to‐noise ratio (SNR) causes inaccuracy and less precision in cerebral blood flow (CBF) and arterial transit time (ATT)…”
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Arterial Transit Time‐Based Multidelay Combination Strategy Improves Arterial Spin Labeling Cerebral Blood Flow Measurement Accuracy in Severe Steno‐Occlusive Diseases by Amemiya, Shiori, Watanabe, Yusuke, Takei, Naoyuki, Ueyama, Tsuyoshi, Miyawaki, Satoru, Koizumi, Satoshi, Kato, Seiji, Takao, Hidemasa, Abe, Osamu, Saito, Nobuhito

“…Background Although perfusion imaging plays a key role in the management of steno‐occlusive diseases, the clinical usefulness of arterial spin labeling (ASL)…”
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Accelerated Two‐Point Dixon MR Angiography Improves Diagnostic Performance for Cervical Artery Diseases by Amemiya, Shiori, Takei, Naoyuki, Ueyama, Tsuyoshi, Fujii, Keita, Takao, Hidemasa, Yasaka, Koichiro, Watanabe, Yusuke, Kamiya, Kouhei, Abe, Osamu

“…Background Nonenhanced MR angiography (MRA) studies are often used to manage acute and chronic large cervical artery disease, but lengthy scan times limit…”
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Feasibility of Quantitative MRI Using 3D‐QALAS for Discriminating Immunohistochemical Status in Invasive Ductal Carcinoma of the Breast by Amano, Maki, Fujita, Shohei, Takei, Naoyuki, Sano, Katsuhiro, Wada, Akihiko, Sato, Kanako, Kikuta, Junko, Kuwatsuru, Yoshiki, Tachibana, Rina, Sekine, Towa, Horimoto, Yoshiya, Aoki, Shigeki

“…Background Two‐dimensional synthetic MRI of the breast has limited spatial coverage. Three‐dimensional (3D) synthetic MRI could provide volumetric quantitative…”
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Rigid real-time prospective motion-corrected three-dimensional multiparametric mapping of the human brain by Fujita, Shohei, Hagiwara, Akifumi, Takei, Naoyuki, Fukunaga, Issei, Hagiwara, Yasuhiro, Ogawa, Takashi, Hatano, Taku, Rettmann, Dan, Banerjee, Suchandrima, Hwang, Ken-Pin, Amemiya, Shiori, Kamagata, Koji, Hattori, Nobutaka, Abe, Osamu, Aoki, Shigeki

“…To develop a rigid real-time prospective motion-corrected multiparametric mapping technique and to test the performance of quantitative estimates. Motion…”
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Deep Learning Approach for Generating MRA Images From 3D Quantitative Synthetic MRI Without Additional Scans by Fujita, Shohei, Hagiwara, Akifumi, Otsuka, Yujiro, Hori, Masaaki, Takei, Naoyuki, Hwang, Ken-Pin, Irie, Ryusuke, Andica, Christina, Kamagata, Koji, Akashi, Toshiaki, Kunishima Kumamaru, Kanako, Suzuki, Michimasa, Wada, Akihiko, Abe, Osamu, Aoki, Shigeki

“…OBJECTIVESQuantitative synthetic magnetic resonance imaging (MRI) enables synthesis of various contrast-weighted images as well as simultaneous quantification…”
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Reliability and Sensitivity to Longitudinal CBF Changes in Steno‐Occlusive Diseases: ASL Versus 123I‐IMP‐SPECT by Amemiya, Shiori, Takao, Hidemasa, Watanabe, Yusuke, Takei, Naoyuki, Ueyama, Tsuyoshi, Kato, Seiji, Miyawaki, Satoru, Koizumi, Satoshi, Abe, Osamu, Saito, Nobuhito

“…Background Noninvasive cerebral blood flow (CBF) monitoring using arterial spin labeling (ASL) magnetic resonance imaging is useful for managing large cerebral…”
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Robust arterial transit time and cerebral blood flow estimation using combined acquisition of Hadamard‐encoded multi‐delay and long‐labeled long‐delay pseudo‐continuous arterial spin labeling: a simulation and in vivo study by Ishida, Shota, Kimura, Hirohiko, Isozaki, Makoto, Takei, Naoyuki, Fujiwara, Yasuhiro, Kanamoto, Masayuki, Kosaka, Nobuyuki, Matsuda, Tsuyoshi, Kidoya, Eiji

“…Arterial transit time (ATT) prolongation causes an error of cerebral blood flow (CBF) measurement during arterial spin labeling (ASL). To improve the accuracy…”
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The Utility of Arterial Transit Time Measurement for Evaluating the Hemodynamic Perfusion State of Patients with Chronic Cerebrovascular Stenosis or Occlusive Disease: Correlative Study between MR Imaging and 15O-labeled H2O Positron Emission Tomography by Takeuchi, Kayo, Isozaki, Makoto, Higashino, Yoshifumi, Kosaka, Nobuyuki, Kikuta, Ken-ichiro, Ishida, Shota, Kanamoto, Masayuki, Takei, Naoyuki, Okazawa, Hidehiko, Kimura, Hirohiko

“…Purpose: To verify whether arterial transit time (ATT) mapping can correct arterial spin labeling-cerebral blood flow (ASL-CBF) values and to verify whether…”
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Repeatability and reproducibility of human brain morphometry using three‐dimensional magnetic resonance fingerprinting by Fujita, Shohei, Buonincontri, Guido, Cencini, Matteo, Fukunaga, Issei, Takei, Naoyuki, Schulte, Rolf F., Hagiwara, Akifumi, Uchida, Wataru, Hori, Masaaki, Kamagata, Koji, Abe, Osamu, Aoki, Shigeki

“…Three‐dimensional (3D) Magnetic resonance fingerprinting (MRF) permits whole‐brain volumetric quantification of T1 and T2 relaxation values, potentially…”
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Noncontrast MR angiography for supraaortic arteries using inflow enhanced inversion recovery fast spin echo imaging by Takei, Naoyuki, Miyoshi, Mitsuharu, Kabasawa, Hiroyuki

“…Purpose: To depict supraaortic arteries using (3D fast spin echo (FSE) combined with slab selective inversion recovery for noncontrast magnetic resonance…”
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Evaluation of retained products of conception using pulsed continuous arterial spin-labeling MRI: clinical feasibility and initial results by Kosaka, Nobuyuki, Fujiwara, Yasuhiro, Kurokawa, Tetsuji, Matsuda, Tsuyoshi, Kanamoto, Masayuki, Takei, Naoyuki, Takata, Kenji, Takahashi, Jin, Yoshida, Yoshio, Kimura, Hirohiko

“…Objectives We evaluated the vascularity of retained products of conception (RPOC) using arterial spin-labeling magnetic resonance imaging (ASL-MRI) to clarify…”
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Single-breath-hold thin-slice gadoxetic acid-enhanced hepatobiliary MR imaging using a newly developed three-dimensional fast spoiled gradient-echo sequence by Hori, Masatoshi, Kim, Tonsok, Onishi, Hiromitsu, Takei, Naoyuki, Wakayama, Tetsuya, Sakane, Makoto, Dia, Aliou Amadou, Tsuboyama, Takahiro, Nakamoto, Atsushi, Tatsumi, Mitsuaki, Tomiyama, Noriyuki

“…Abstract Purpose To prospectively evaluate the efficacy of a new three-dimensional gradient-echo sequence (Turbo LAVA) that uses undersampled k-space…”
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Comparison between supervised and physics‐informed unsupervised deep neural networks for estimating cerebral perfusion using multi‐delay arterial spin labeling MRI by Ishida, Shota, Fujiwara, Yasuhiro, Takei, Naoyuki, Kimura, Hirohiko, Tsujikawa, Tetsuya

“…This study aimed to implement a physics‐informed unsupervised deep neural network (DNN) to estimate cerebral blood flow (CBF) and arterial transit time (ATT)…”
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Enhanced parameter estimation in multiparametric arterial spin labeling using artificial neural networks by Ishida, Shota, Fujiwara, Yasuhiro, Matta, Yuki, Takei, Naoyuki, Kanamoto, Masayuki, Kimura, Hirohiko, Tsujikawa, Tetsuya

“…Purpose Multiparametric arterial spin labeling (MP‐ASL) can quantify cerebral blood flow (CBF) and arterial cerebral blood volume (CBVa). However, its accuracy…”
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Effects of the Training Data Condition on Arterial Spin Labeling Parameter Estimation Using a Simulation-Based Supervised Deep Neural Network by Ishida, Shota, Isozaki, Makoto, Fujiwara, Yasuhiro, Takei, Naoyuki, Kanamoto, Masayuki, Kimura, Hirohiko, Tsujikawa, Tetsuya

“…A simulation-based supervised deep neural network (DNN) can accurately estimate cerebral blood flow (CBF) and arterial transit time (ATT) from multidelay…”
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Time resolved DCE-MRI of the kidneys: Evaluation of the renal vasculatures and tumors using F-DISCO with and without compressed sensing in normal and wide-bore 3T systems by Yamada, Takahiro, Masui, Takayuki, Sasaki, Masako, Katayama, Motoyuki, Iwadate, Yuji, Takei, Naoyuki, Miyoshi, Mitsuharu

“…Dynamic contrast-enhanced MR imaging (DCE-MRI) has been widely used for the evaluation of renal arteries. This method is also useful for tumor and renal…”
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Feasibility of Internally Referenced Brain Temperature Imaging with a Metabolite Signal by KURODA, Kagayaki, TAKEI, Naoyuki, MULKERN, Robert V., OSHIO, Koichi, NAKAI, Toshiharu, OKADA, Tomohisa, MATSUMURA, Akira, YANAKA, Kiyoyuki, HYNYNEN, Kullervo, JOLESZ, Ferenc A.

“…The feasibility of using a metabolite signal as an internal reference for self-referenced temperature distribution measurement was examined. Line scan…”
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Separating spin compartments in arterial spin labeling using delays alternating with nutation for tailored excitation (DANTE) pulse: A validation study using T2‐relaxometry and application to arterial cerebral blood volume imaging by Ishida, Shota, Kimura, Hirohiko, Takei, Naoyuki, Fujiwara, Yasuhiro, Matsuda, Tsuyoshi, Kanamoto, Masayuki, Matta, Yuki, Kosaka, Nobuyuki, Kidoya, Eiji

“…Purpose To clarify the type of spin compartment in arterial spin labeling (ASL) that is eliminated by delays alternating with nutation for tailored excitation…”
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Accelerated Isotropic Multiparametric Imaging by High Spatial Resolution 3D-QALAS With Compressed Sensing: A Phantom, Volunteer, and Patient Study by Fujita, Shohei, Hagiwara, Akifumi, Takei, Naoyuki, Hwang, Ken-Pin, Fukunaga, Issei, Kato, Shimpei, Andica, Christina, Kamagata, Koji, Yokoyama, Kazumasa, Hattori, Nobutaka, Abe, Osamu, Aoki, Shigeki

“…OBJECTIVESThe aims of this study were to develop an accelerated multiparametric magnetic resonance imaging method based on 3D-quantification using an…”
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