Shiori Amemiya

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PURPOSE To test the feasibility of noninvasive global assessment of cerebral hemodynamic impairment with use of resting-state blood oxygenation level-dependent functional magnetic resonance (MR) imaging. MATERIALS AND METHODS In this institutional review board-approved study, five patients with chronic hypoperfusion without neurologic impairment and six(More)
BACKGROUND AND PURPOSE We analyzed the ability of a machine learning approach that uses diffusion tensor imaging (DTI) structural connectomes to determine lateralization of epileptogenicity in temporal lobe epilepsy (TLE). MATERIALS AND METHODS We analyzed diffusion tensor and 3-dimensional (3D) T1-weighted images of 44 patients with TLE (right, 15, left,(More)
A case of venous congestion associated with developmental venous anomaly (DVA) in a 5-year-old girl who presented with acute deterioration of consciousness is reported. Susceptibility-weighted imaging revealed abnormal structures connected to the central collector of a DVA, which were not shown on other sequences. These structures were considered to be(More)
Several new entities of central nervous system tumors have been established in the past decade. By reviewing our cases and previous reports, we describe 4 neuronal and mixed neuronal-glial tumors (papillary glioneuronal tumor, extraventricular neurocytoma, rosette-forming glioneuronal tumor of the fourth ventricle, and glioneuronal tumor with neuropil-like(More)
INTRODUCTION The purpose of this study is to apply contrast-enhanced 3D fast-imaging employing steady-state acquisition (3D-FIESTA) imaging to the evaluation of cranial nerves (CN) in patients with cavernous sinus tumors. METHODS Contrast-enhanced 3D-FIESTA images were acquired from ten patients with cavernous sinus tumors with a 3-T unit. RESULTS In(More)
OBJECTIVE Magnetic resonance imaging (MRI) is the most popular follow-up study for patients who have undergone spinal surgery. However, the image quality often becomes poor because of artifacts from metal implants and/or from failed fat suppression, which obscure diagnosis. Iterative decomposition of water and fat with echo asymmetry and least-squares(More)
BACKGROUND To evaluate the lifetime potential benefits and cost-effectiveness of using 64 multidetector-row computed tomography coronary angiography (CTCA) as a noninvasive imaging modality for patients at risk for coronary artery disease (CAD). METHODS AND RESULTS A decision and cost-effective analysis using a Markov model was performed to compare 4(More)
Papillary tumor of the pineal region (PTPR), recently described as a distinct clinicopathological entity, can show aggressive biological behavior. The optimal therapeutic approach of PTPR has not been well defined. The role of surgery, radiotherapy, and chemotherapy in the treatment of PTPR was analyzed in a large multicenter series. In order to determine(More)
Among a range of cognitive functions of the amygdala, recent studies suggest its involvement in identification of the pupil size. To further address its role, we investigated the response of the amygdala to human and cat faces with varied pupil size, taking into account the effect of the gender and subjective attractiveness ratings. Twenty-seven subjects(More)
Conventional resting-state fMRI (rs-fMRI) studies have focused on investigating the synchronous neural activity in functionally relevant distant regions that are termed as resting-state networks. On the other hand, less is known about the spatiotemporal dynamics of the spontaneous activity of the brain. By examining the characteristics of both rs-fMRI and(More)