Search Results - "Hirayama, Akihiro"

Changing the Currently Held Concept of Cerebrospinal Fluid Dynamics Based on Shared Findings of Cerebrospinal Fluid Motion in the Cranial Cavity Using Various Types of Magnetic Resonance Imaging Techniques by MATSUMAE, Mitsunori, KURODA, Kagayaki, YATSUSHIRO, Satoshi, HIRAYAMA, Akihiro, HAYASHI, Naokazu, TAKIZAWA, Ken, ATSUMI, Hideki, SORIMACHI, Takatoshi

“…The “cerebrospinal fluid (CSF) circulation theory” of CSF flowing unidirectionally and circulating through the ventricles and subarachnoid space in a downward…”
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Heterochrony and growth rate variation mediate the development of divergent genital morphologies in closely related Ohomopterus ground beetles by Terada, Karen, Nishimura, Taira, Hirayama, Akihiro, Takami, Yasuoki

“…The rapid divergence of genital morphology is well studied in the context of sexual selection and speciation; however, little is known about the developmental…”
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Frequency and Characteristics of Paraclinoid Aneurysm in Ruptured Cerebral Aneurysms by Shigematsu, Hideaki, Yokota, Kazuma, Hirayama, Akihiro, Sorimachi, Takatoshi

“…This study aimed to determine the frequency of paraclinoid aneurysms among ruptured cerebral aneurysms and compare paraclinoid aneurysms with other aneurysms…”
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The Choroid Plexus of the Lateral Ventricle As the Origin of CSF Pulsation Is Questionable by TAKIZAWA, Ken, MATSUMAE, Mitsunori, HAYASHI, Naokazu, HIRAYAMA, Akihiro, SANO, Fumiya, YATSUSHIRO, Satoshi, KURODA, Kagayaki

“…The advent of magnetic resonance imaging (MRI) enables noninvasive measurement of cerebrospinal fluid (CSF) motion, and new information about CSF motion has…”
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A Case of Iatrogenic Dural Artery–Pial Vein Shunt Treated with Endovascular Treatment by Shigematsu, Hideaki, Yokota, Kazuma, Hirayama, Akihiro, Sorimachi, Takatoshi

“…Objective: A few cases of postsurgical iatrogenic arteriovenous shunts have been reported, with the arterial blood flow directly entering the pial veins…”
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Microstructure and Mechanical Properties of AlSi12CuNi Alloy Fabricated by Laser Powder Bed Fusion Process by Hirayama, Akihiro, Kimura, Masaaki, Kusaka, Masahiro, Kaizu, Koichi

“…The microstructure and mechanical properties of the AlSi12CuNi alloy fabricated by the additive manufacturing technique, laser powder bed fusion (L-PBF), were…”
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Research into the Physiology of Cerebrospinal Fluid Reaches a New Horizon: Intimate Exchange between Cerebrospinal Fluid and Interstitial Fluid May Contribute to Maintenance of Homeostasis in the Central Nervous System by MATSUMAE, Mitsunori, SATO, Osamu, HIRAYAMA, Akihiro, HAYASHI, Naokazu, TAKIZAWA, Ken, ATSUMI, Hideki, SORIMACHI, Takatoshi

“…Cerebrospinal fluid (CSF) plays an essential role in maintaining the homeostasis of the central nervous system. The functions of CSF include: (1) buoyancy of…”
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Magnetic resonance imaging technique for visualization of irregular cerebrospinal fluid motion in the ventricular system and subarachnoid space by Horie, Tomohiko, RT, Kajihara, Nao, RT, Matsumae, Mitsunori, MD, DMSC, Obara, Makoto, PhD, Hayashi, Naokazu, MD, PhD, Hirayama, Akihiro, MD, PhD, Takizawa, Ken, MD, Takahara, Taro, MD, PhD, Yatsushiro, Satoshi, BSc, Kuroda, Kagayaki, PhD

“…Abstract Background Many studies have shown that cerebrospinal fluid (CSF) behaves irregularly, rather than with laminar flow, in the various CSF spaces. We…”
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Benefits and Risks of CT Angiography Immediately after Emergency Arrival for Patients with Intracerebral Hematoma by SORIMACHI, Takatoshi, ATSUMI, Hideki, YONEMOCHI, Takuya, HIRAYAMA, Akihiro, SHIGEMATSU, Hideaki, SRIVATANAKUL, Kittipong, TAKIZAWA, Shunya, MATSUMAE, Mitsunori

“…Computed tomography angiography (CTA) immediately after diagnosis of intracerebral hematoma (ICH) on noncontrast CT in the emergency room has benefits, which…”
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Cardiac-driven Pulsatile Motion of Intracranial Cerebrospinal Fluid Visualized Based on a Correlation Mapping Technique by Yatsushiro, Satoshi, Sunohara, Saeko, Hayashi, Naokazu, Hirayama, Akihiro, Matsumae, Mitsunori, Atsumi, Hideki, Kuroda, Kagayaki

“…Purpose: A correlation mapping technique delineating delay time and maximum correlation for characterizing pulsatile cerebrospinal fluid (CSF) propagation was…”
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Retrospective review of previous minor leak before major subarachnoid hemorrhage diagnosed by MRI as a predictor of occurrence of symptomatic delayed cerebral ischemia by Oda, Shinri, Shimoda, Masami, Hirayama, Akihiro, Imai, Masaaki, Komatsu, Fuminari, Shigematsu, Hideaki, Nishiyama, Jun, Hotta, Kazuko, Matsumae, Mitsunori

“…OBJECTIVE This study attempted to determine whether a previous minor leak correlated with the occurrence of symptomatic delayed cerebral ischemia (sDCI)…”
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Microcatheter Re-Shaping Using Fusion Image in Coil Embolization: A Technical Note by Hirayama, Akihiro, Srivatanakul, Kittipong, Shigematsu, Hideaki, Yokota, Kazuma, Sorimachi, Takatoshi, Matsumae, Mitsunori

“…Objective: We report the utility of microcatheter reshaping by referring to fusion images with 3D-DSA and microcatheter 3D images made using non-subtraction…”
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Ruptured posterior inferior cerebellar artery aneurysm associated with persistent primitive hypoglossal artery: A case report by Shigematsu, Hideaki, Yokota, Kazuma, Hirayama, Akihiro, Sorimachi, Takatoshi

“…Until now, 9 cases of an association of a posterior inferior cerebellar artery (PICA) aneurysm with the persistent primitive hypoglossal artery (PPHA) have…”
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Quantitative Analysis of Cerebrospinal Fluid Pressure Gradients in Healthy Volunteers and Patients with Normal Pressure Hydrocephalus by HAYASHI, Naokazu, MATSUMAE, Mitsunori, YATSUSHIRO, Satoshi, HIRAYAMA, Akihiro, ABDULLAH, Afnizanfaizal, KURODA, Kagayaki

“…Magnetic resonance imaging (MRI) can depict not only anatomical information, but also physiological factors such as velocity and pressure gradient. Measurement…”
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Mechanical Properties of AlSi12 Alloy Manufactured by Laser Powder Bed Fusion Technique by Kimura, Masaaki, Hirayama, Akihiro, Yoshioka, Junya, Maekawa, Hosei, Kusaka, Masahiro, Kaizu, Koichi, Takahashi, Tsuyoshi

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Hyperdynamic CSF motion profiles found in idiopathic normal pressure hydrocephalus and Alzheimer's disease assessed by fluid mechanics derived from magnetic resonance images by Takizawa, Ken, Matsumae, Mitsunori, Hayashi, Naokazu, Hirayama, Akihiro, Yatsushiro, Satoshi, Kuroda, Kagayaki

“…Magnetic resonance imaging (MRI) does not only ascertain morphological features, but also measures physiological properties such as fluid velocity or pressure…”
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Visualization of Pulsatile CSF Motion Around Membrane-like Structures with both 4D Velocity Mapping and Time-SLIP Technique by HIRAYAMA, Akihiro, MATSUMAE, Mitsunori, YATSUSHIRO, Satoshi, ABDULLA, Afnizanfaizal, ATSUMI, Hideki, KURODA, Kagayaki

“…Purpose: We compared the depiction of pulsatile CSF motion obtained by 4-dimensional phase-contrast velocity mapping (4D-VM) with that by time-spatial labeling…”
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A Protocol of Infection Control for Mechanical Thrombectomy in Possible COVID-19 Patients: Tokai University COVID-19 Manual by Srivatanakul, Kittipong, Asai, Satomi, Hirayama, Akihiro, Shigematsu, Hideaki, Niita, Makiko, Kawakami, Tomoko, Sorimachi, Takatoshi, Matsumae, Mitsunori

“…The crisis of the coronavirus disease (COVID-19) is causing damage to the social and medical community. However, extreme emergency neuro-interventions such as…”
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Endoscopic Endonasal Repair of Cerebrospinal Fluid Leakage Caused by a Rare Traumatic Clival Fracture by HIRAYAMA, Akihiro, KOMATSU, Fuminari, HOTTA, Kazuko, IMAI, Masaaki, ODA, Shinri, SHIMODA, Masami, MATSUMAE, Mitsunori

“…An 89-year-old male presented with cerebrospinal fluid (CSF) rhinorrhea associated with head trauma sustained as a pedestrian in a traffic accident. Computed…”
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Diagnostic Tests for COVID-19 and Their Accuracy: Important Information for Physicians Caring for Patients with Stroke by Hirayama, Akihiro, Asai, Satomi, Srivatanakul, Kittipong, Yokota, Kazuma, Shigematsu, Hideaki, Sorimachi, Takatoshi, Matsumae, Mitsunori

“…Coronavirus disease 2019 (COVID-19) is caused by severe acute respiratory syndrome coronavirus 2 (SAR-CoV-2), which appeared at the end of 2019 and has spread…”
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