Search results for: Hajime Yokota

Items from 1 to 20 out of 28 results

article

Relationship Between Patient‐Friendly Audiovisual Systems and MRI Contrast Agent to Adverse Reactions

Keisuke Nitta, Koji Matsumoto, Hajime Yokota, Taisuke Murata, more

Journal of Magnetic Resonance Imaging > 59 > 6 > 2013 - 2020

Background Patient‐friendly audiovisual (AV) systems in head MRI examinations can potentially reduce patient anxiety and contrast‐enhanced MRI (CE‐MRI) adverse reactions to gadolinium. Purpose To evaluate whether a patient‐friendly AV system reduces the rate of adverse reactions to gadolinium‐based contrast agents. Study Type Retrospective. Population Four thousand eight hundred thirty‐two...

article

Dopaminergic Correlates of Regional Cerebral Blood Flow in Parkinsonian Disorders

Yoshikazu Nakano, Shigeki Hirano, Kazuho Kojima, Honglinag Li, more

Movement Disorders > 37 > 6 > 1235 - 1244

Background Cerebral blood flow (CBF) and dopamine transporter (DAT) images are clinically used for the differential diagnosis of parkinsonian disorders. Objectives This study aimed to examine the correlation of CBF with striatal DAT in patients with Parkinson's disease (PD) and atypical parkinsonian syndromes (APS) and evaluate the diagnostic power of DAT‐correlated CBF in PD through machine learning...

article

MR diffusion and dynamic‐contrast enhanced imaging to distinguish meningioma, paraganglioma, and schwannoma in the cerebellopontine angle and jugular foramen

Yoshiaki Ota, Eric Liao, Aristides A. Capizzano, Hajime Yokota, more

Journal of Neuroimaging > 32 > 3 > 502 - 510

Background and Purpose Differentiation of meningiomas, paragangliomas, and schwannomas in the cerebellopontine angle and jugular foramen remains challenging when conventional MRI findings are inconclusive. This study aimed to assess the clinical utility of diffusion‐weighted imaging (DWI) and dynamic contrast‐enhanced MRI (DCE‐MRI) findings for tumor type differentiation and to identify the most...

article

Clinical feasibility of single‐shot fluid‐attenuated inversion recovery with wide inversion recovery pulse designed to reduce cerebrospinal fluid and motion artifacts for evaluation of uncooperative patients in acute stroke protocol

Yoshihiro Kubota, Hajime Yokota, Takayuki Sakai, Masami Yoneyama, more

Journal of Magnetic Resonance Imaging > 53 > 6 > 1833 - 1838

Fluid‐attenuated inversion recovery (FLAIR) imaging is a key sequence for stroke assessment. Motion artifact reduction with short acquisition time is still challenging, but necessary in the magnetic resonance (MR) stroke protocol, especially for uncooperative patients suspected of stroke. The aim of this study is to investigate the feasibility of modified single‐shot FLAIR with wide inversion recovery...

article

Pineal volume reduction in patients with mild cognitive impairment who converted to Alzheimer's disease

Teruyuki Matsuoka, Nozomu Oya, Hajime Yokota, Kentaro Akazawa, more

Psychiatry and Clinical Neurosciences > 74 > 11 > 587 - 593

Aim Pineal parenchymal volume (PPV) reduction is one of the predisposing factors for Alzheimer's disease (AD). Therefore, PPV could be used as a predictor of developing AD in clinical settings. We investigated whether PPV in patients with mild cognitive impairment (MCI) was correlated with conversion of these patients to AD. Methods A total of 237 patients with MCI underwent brain magnetic resonance...

article

The Relationship Between Gelatin Sponge Preparation Methods and the Incidence of Intrauterine Synechia Following Uterine Artery Embolization for Postpartum Hemorrhage

Atsushi Saiga, Hajime Yokota, Takashi Higashide, Hazuki Takishima, more

CardioVascular and Interventional Radiology > 2019 > 42 > 2 > 195-204

Purpose To evaluate the relationship between gelatin sponge preparation methods and the incidence of intrauterine synechia following uterine artery embolization (UAE) for postpartum hemorrhage (PPH). Materials and Methods In a retrospective monocentric study, we used data from 20 consecutive UAE procedures (19 patients) for PPH, performed in 2007–2016, in which gelatin sponge had been used. The...

article

Diagnostic performance of initial enhancement analysis using ultra-fast dynamic contrast-enhanced MRI for breast lesions

Mariko Goto, Koji Sakai, Hajime Yokota, Maki Kiba, more

European Radiology > 2019 > 29 > 3 > 1164-1174

Objectives To assess the diagnostic value and contribution to BI-RADS categorisation of initial enhancement on ultra-fast DCE-MRI for differentiating malignant and benign breast lesions. Methods The institutional review board approved this study, and written informed consent was obtained from each participant. Both ultra-fast DCE-MRI for initial enhancement analysis and conventional MRI were performed...

article

Differences between postmortem CT and autopsy in death investigation of cervical spine injuries

Yohsuke Makino, Hajime Yokota, Eiji Nakatani, Daisuke Yajima, more

Forensic Science International > 2017 > 281 > C > 44-51

To clarify the differences between postmortem CT (PMCT) and autopsy findings in the postmortem detection of cervical spine injuries (CSIs).Our department’s forensic pathology database was searched for CSI cases. In each case, the autopsy data and radiologists’ interpretations were reviewed for the presence of bone fractures and intervertebral injuries.The study included 42 cases. For both bone fractures...

article

Reading efficiency can be improved by minor modification of assigned duties; a pilot study on a small team of general radiologists

Hajime Yokota, Mariko Goto, Chisa Bamba, Maki Kiba, more

Japanese Journal of Radiology > 2017 > 35 > 5 > 262-268

Purpose To assess whether alterations in the type of duty assignment system can affect the reading efficiency and stress level of diagnostic radiologists. Materials and methods Fourteen board-certified diagnostic radiologists were enrolled. We investigated three different reading systems for 1 week each. System 1 is our default, in which there are no assigned duties and everyone finishes when all...

article

Sudden death due to coronary artery dissection associated with fibromuscular dysplasia revealed by postmortem selective computed tomography coronary angiography: A case report

Yohsuke Makino, Go Inokuchi, Hajime Yokota, Mutsumi Hayakawa, more

Forensic Science International > 2015 > 253 > Complete > e10-e15

We present an autopsy case of sudden death due to coronary artery dissection associated with fibromuscular dysplasia (FMD) in a young female patient. Postmortem selective coronary artery computed tomography (CT) angiography revealed dissections of the left anterior descending and left circumflex arteries. These findings were confirmed by subsequent autopsy. Histopathological examination revealed coronary...

article

Can ruptured abdominal aortic aneurysm be accurately diagnosed as the cause of death without postmortem computed tomography when autopsies cannot be performed?

Yohsuke Makino, Seiji Yamamoto, Seiji Shiotani, Hideyuki Hayakawa, more

Forensic Science International > 2015 > 249 > C > 107-111

This study aimed to conduct a multicentre retrospective review of cases to clarify how many ruptured abdominal aortic aneurysms (RAAAs) as the cause of death could be diagnosed without post-mortem computed tomography (PMCT) when autopsies cannot be performed.We collected consecutive PMCT data from January 2002 to December 2009 from three institutes where PMCT examinations are performed on a routine...

article

Putaminal hypointensity on T2*-weighted MR imaging is the most practically useful sign in diagnosing multiple system atrophy: A preliminary study

Atsuhiko Sugiyama, Shoichi Ito, Tomoki Suichi, Toru Sakurai, more

Journal of the Neurological Sciences > 2015 > 349 > 1-2 > 174-178

To identify useful MRI abnormalities in the putamen for diagnosing multiple system atrophy.Patients with multiple system atrophy (n=15), Parkinson's disease (n=16), or progressive supranuclear palsy (n=9) and healthy controls (n=10) were enrolled. Using a visual analog scale, 4 examiners independently rated high-intensity signals along the lateral putamen on T2-weighted and T2*-weighted images, low-intensity...

article

Reconstruction magnetic resonance neurography in chronic inflammatory demyelinating polyneuropathy

Kazumoto Shibuya, Atsuhiko Sugiyama, Sho‐ichi Ito, Sonoko Misawa, more

Annals of Neurology > 77 > 2 > 333 - 337

To study distribution and patterns of nerve hypertrophy in chronic inflammatory demyelinating polyneuropathy (CIDP), magnetic resonance neurography with 3‐dimensional reconstruction of short tau inversion recovery images was performed in 33 patients. This technique clearly showed longitudinal morphological changes from the cervical roots to the nerve trunks in the proximal arm. Nerve enlargement was...

article

Mercury embolism of the lung and right ventricle revealed by postmortem computed tomography and X-ray analytic microscopy

Yohsuke Makino, Hiroko Abe, Masaaki Yokoyama, Suguru Torimitsu, more

Forensic Science, Medicine, and Pathology > 2015 > 11 > 3 > 464-467

article

Brainstem White Matter Tracts and the Control of Eye Movements

Koji Sakai, Hajime Yokota, Kentaro Akazawa, Kei Yamada

Seminars in Ultrasound, CT, and MRI > 2014 > 35 > 5 > 517-526

This article summarizes the anatomy of brainstem tracts and cranial nerves as depicted by magnetic resonance imaging, with special emphasis on the structures that are involved in the control of eye movement. It discusses the anatomical structures that can be observed on conventional magnetic resonance images as well as structures that can only be observed using more advanced imaging techniques such...

article

Coronal reformatted CT images contribute to the precise evaluation of the radiofrequency ablative margin for hepatocellular carcinoma

Tenyu Motoyama, Sadahisa Ogasawara, Tetsuhiro Chiba, Takashi Higashide, more

Abdominal Radiology > 2014 > 39 > 2 > 262-268

Objective The purpose of the present study was to evaluate the usefulness of coronal reformatted images obtained from 64-slice multi-detector computed tomography to assess the ablative margin (AM) in hepatocellular carcinoma (HCC) treated with radio frequency ablation (RFA). Methods Ninety-five HCC nodules were analyzed in 66 HCC patients treated with RFA. Two radiologists and one hepatologist independently...

article

Internal hernia associated with colostomy after laparoscopic abdominoperineal resection

Hajime Yokota, Isamu Hoshino, Yuji Sugamoto, Toru Fukunaga, more

Clinical Imaging > 2013 > 37 > 3 > 590-592

We herein describe a case with an internal hernia that developed after laparoscopic abdominoperineal resection for rectal cancer. The small intestine passed through the space between the sigmoid colon loop of the stoma and the abdominal wall. Internal hernias associated with colostomy are rare; however, the condition is an important complication, because it causes ischemia in both the herniated intestine...

article

Fat suppression strategies in MR imaging of breast cancer at 3.0 T: comparison of the two-point Dixon technique and the frequency selective inversion method

Wakako Kaneko Mikami, Toshiki Kazama, Hirotaka Sato, Hajime Yokota, more

Japanese Journal of Radiology > 2013 > 31 > 9 > 615-622

Purpose To compare two fat suppression methods in contrast-enhanced MR imaging of breast cancer at 3.0 T: the two-point Dixon method and the frequency selective inversion method. Materials and methods Forty female patients with breast cancer underwent contrast-enhanced three-dimensional T1-weighted MR imaging at 3.0 T. Both the two-point Dixon method and the frequency selective inversion method...

article

Dumbbell-shaped nonpsammomatous malignant melanotic schwannoma of the cervical spinal root

Hajime Yokota, Koichi Isobe, Masazumi Murakami, Hitoshi Kubosawa, more

The Spine Journal > 2012 > 12 > 4 > e14-e17

Melanotic schwannoma is a very rare tumor of Schwann cell origin, which can develop in various locations, similar to conventional schwannoma. This tumor has a malignant potential and therefore careful therapy is required.To describe a case of melanotic schwannoma with a histopathologically and clinically malignant behavior.Case report.A 64-year-old man presented with sensory changes in his arm and...

article

DETECTION OF MULTI-VESSEL DISEASES IN ELDERLY PATIENTS USING DELTA-LONGITUDINAL STRAIN WITH ADENOSINE-STRESS ECHOCARDIOGRAPHY : COMPARISON WITH TL-201 SPECT

Jun Tanaka, Kazumasa Harada, Aya Tanaka, Yasuko Imai, more

Journal of the American College of Cardiology > 2011 > 57 > 14(S) > E771

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INFONA - science communication portal

Search results for: Hajime Yokota

Relationship Between Patient‐Friendly Audiovisual Systems and MRI Contrast Agent to Adverse Reactions

Dopaminergic Correlates of Regional Cerebral Blood Flow in Parkinsonian Disorders

MR diffusion and dynamic‐contrast enhanced imaging to distinguish meningioma, paraganglioma, and schwannoma in the cerebellopontine angle and jugular foramen

Clinical feasibility of single‐shot fluid‐attenuated inversion recovery with wide inversion recovery pulse designed to reduce cerebrospinal fluid and motion artifacts for evaluation of uncooperative patients in acute stroke protocol

Pineal volume reduction in patients with mild cognitive impairment who converted to Alzheimer's disease

The Relationship Between Gelatin Sponge Preparation Methods and the Incidence of Intrauterine Synechia Following Uterine Artery Embolization for Postpartum Hemorrhage

Diagnostic performance of initial enhancement analysis using ultra-fast dynamic contrast-enhanced MRI for breast lesions

Differences between postmortem CT and autopsy in death investigation of cervical spine injuries

Reading efficiency can be improved by minor modification of assigned duties; a pilot study on a small team of general radiologists

Sudden death due to coronary artery dissection associated with fibromuscular dysplasia revealed by postmortem selective computed tomography coronary angiography: A case report

Can ruptured abdominal aortic aneurysm be accurately diagnosed as the cause of death without postmortem computed tomography when autopsies cannot be performed?

Putaminal hypointensity on T2*-weighted MR imaging is the most practically useful sign in diagnosing multiple system atrophy: A preliminary study

Reconstruction magnetic resonance neurography in chronic inflammatory demyelinating polyneuropathy

Mercury embolism of the lung and right ventricle revealed by postmortem computed tomography and X-ray analytic microscopy

Brainstem White Matter Tracts and the Control of Eye Movements

Coronal reformatted CT images contribute to the precise evaluation of the radiofrequency ablative margin for hepatocellular carcinoma

Internal hernia associated with colostomy after laparoscopic abdominoperineal resection

Fat suppression strategies in MR imaging of breast cancer at 3.0 T: comparison of the two-point Dixon technique and the frequency selective inversion method

Dumbbell-shaped nonpsammomatous malignant melanotic schwannoma of the cervical spinal root

DETECTION OF MULTI-VESSEL DISEASES IN ELDERLY PATIENTS USING DELTA-LONGITUDINAL STRAIN WITH ADENOSINE-STRESS ECHOCARDIOGRAPHY : COMPARISON WITH TL-201 SPECT

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