• Multiple Sclerosis
    • Kouhei Kamiya
    • Kouhei Kamiya: Influence Statistics

      Kouhei Kamiya

      Kouhei Kamiya

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      Department of Diagnostic Radiology, Toho University Omori Medical Center | Department of Radiology, Juntendo University School of Medicine, Tokyo, Japan | Department of ...

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      Kouhei Kamiya:Expert Impact

      Concepts for whichKouhei Kamiyahas direct influence:Multiple sclerosis,Axon diameter,Neurite orientation dispersion,Spinal cord,White matter,Corticospinal tract,Choroid plexus cysts,Diffusion tensor.

      Kouhei Kamiya:KOL impact

      Concepts related to the work of other authors for whichfor which Kouhei Kamiya has influence:White matter,Multiple sclerosis,Density imaging,Parkinson disease,Magnetic resonance,Diffusion mri,Orientation dispersion.

      KOL Resume for Kouhei Kamiya


      Department of Diagnostic Radiology, Toho University Omori Medical Center


      Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan


      Department of Radiology, The University of Tokyo, Tokyo, Japan


      Department of Radiology, The University of Tokyo, Bunkyo, Tokyo, Japan


      Department of Radiology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan; Department of Radiology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.


      Department of Radiology, Juntendo University School of Medicine, Bunkyo, Tokyo, Japan


      Department of Radiology, The University of Tokyo Hospital, Tokyo, Japan

      Division of Radiology, and Biomedical Engineering, Graduate School of Medicine, The University of Tokyo


      Department of Radiology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo, 113-8431 Japan


      1 Department of Radiology, National Center of Neurology and Psychiatry, Tokyo 187-8551, Japan ; 2 Department of Radiology, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan ; 3 Division of nuclear Medicine, International Medical Center of Global Health, Tokyo 162-8655, Japan ; 4 Department of Otolaryngology, Head and Neck Surgery, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan.

      National Center Hospital of Neurology and Psychiatry Radiology Kodaira Tokyo Japan


      Department of Radiology, National Center of Neurology and Psychiatry, 4-1-1, Ogawa-Higashi, Kodaira, Tokyo 187-8551, Japan


      Department of Radiology, National Center Hospital of Neurology and Psychiatry, Tokyo, Japan


      Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8655, Tokyo, Japan

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      Sample of concepts for which Kouhei Kamiya is among the top experts in the world.
      Concept World rank
      measurements emerging fields #3
      bvalue diffusionweighted images #3
      equations diffusion imaging #3
      theory real imaging #3
      micrometer scale equations #3
      condition micrometer scale #3
      tissue structure condition #3
      unique contrast ability #3
      diffusion phenomenon measurements #3
      conclusiongraph analysis #4
      diffusion imaging theory #4
      cerebral pain matrix #4
      cortex bms #4
      deconvolution msmt #4
      msmtcsd model #4
      interreader agreement flexa #5
      axon diameter body #5
      plaque detection sensitivity #5
      cmra 647″ acquisitions #5
      ias volume #5
      trend ias #5
      agreement flexa #5
      cmra specificity #5
      low qvalue method #5
      dmri data clinical #5
      background flexa #5
      higher flexa #5
      κ plaque detection #5
      microstructure qsi #5
      diffusion qspace imaging #5
      interreader plaque #5
      mip luminal #5
      cmra flexa #5
      flexa κ #5
      fraction eas #5
      flexa readers #5
      specificity flexa #5
      κ cmra #5
      cmra κ #5
      128″ #5
      flexa enhanced #5
      substantial cmra #5
      noddi rapidly #5
      accelerated cervical mra #5
      flexa interreader #5
      ppv flexa #5
      experiment axon #5
      flexa interreader agreement #5
      attenuations maximum #5
      diameter ias #5
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      Prominent publications by Kouhei Kamiya

      KOL-Index: 10966

      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, 29; mean age, 33.0 ± 11.6 years) and 14 age-matched controls. We constructed a whole brain structural connectome for each subject, ...

      Known for Machine Learning | Temporal Lobe Epilepsy | Diffusion Tensor | Structural Brain | Versus Tle
      KOL-Index: 10702

      ObjectivesWe used neurite orientation dispersion and density imaging (NODDI) to quantify changes in the substantia nigra pars compacta (SNpc) and striatum in Parkinson disease (PD).MethodsDiffusion-weighted magnetic resonance images were acquired from 58 PD patients and 36 age- and sex-matched controls. The intracellular volume fraction (Vic), orientation dispersion index (OD), and isotropic volume fraction (Viso) of the basal ganglia were compared between groups. Multivariate logistic ...

      Known for Density Imaging | Orientation Dispersion | Parkinson Disease | Substantia Nigra | Basal Ganglia
      KOL-Index: 10618

      OBJECTIVES: To compare the differences in metal artefact degree and the depiction of structures in helical neck CT, in patients with metallic dental fillings, among adaptive iterative dose reduction three dimensional (AIDR 3D), forward-projected model-based iterative reconstruction solution (FIRST) and AIDR 3D with single-energy metal artefact reduction (SEMAR-A).

      METHODS: In this retrospective clinical study, 22 patients (males, 13; females, 9; mean age, 64.6 ± 12.6 years) with metallic ...

      Known for Metal Artefact | Computed Tomography | Iterative Reconstruction | Aidr Semara | Dental Fillings
      KOL-Index: 10554

      Despite important efforts to solve the clinico-radiological paradox, correlation between lesion load and physical disability in patients with multiple sclerosis remains modest. One hypothesis could be that lesion location in corticospinal tracts plays a key role in explaining motor impairment. In this study, we describe the distribution of lesions along the corticospinal tracts from the cortex to the cervical spinal cord in patients with various disease phenotypes and disability status. ...

      Known for Multiple Sclerosis | Cervical Cord | Lesions Brain | Spatial Distribution | Lesion Load
      KOL-Index: 10481

      In multiple system atrophy with predominant parkinsonism (MSA-P), several voxel-based morphometry (VBM) studies have revealed gray matter loss; however, the white matter volume changes have been rarely reported. We investigated the volume changes of white matter as well as gray matter by VBM. A retrospective MRI study was performed in 20 patients with MSA-P and 30 age-matched healthy controls. We applied VBM with statistical parametric mapping (SPM8) plus diffeomorphic anatomical ...

      Known for White Matter | Spm8 Dartel | Multiple Atrophy | Volume Loss | Msa Patients
      KOL-Index: 10040

      Static encephalopathy of childhood with neurodegeneration in adulthood (SENDA) is a recently established disorder that is a subtype of neurodegeneration with brain iron accumulation (NBIA). We presented the first case report of SENDA of a 39-year-old female. She had psychomotor retardation from childhood and remained static for two decades. Then, at the age of 30, she developed severe dystonia and parkinsonism. Brain MRI revealed T2-weighted hypointensity signal in the globus pallidus ...

      Known for Static Encephalopathy | Tensor Imaging | Childhood Neurodegeneration | Adulthood Senda | Substantia Nigra
      KOL-Index: 9188

      IntroductionDiffusional kurtosis imaging (DKI) is a more sensitive technique than conventional diffusion tensor imaging (DTI) for assessing tissue microstructure. In particular, it quantifies the microstructural integrity of white matter, even in the presence of crossing fibers. The aim of this preliminary study was to compare how DKI and DTI show white matter alterations in Parkinson disease (PD).MethodsDKI scans were obtained with a 3-T magnetic resonance imager from 12 patients with ...

      Known for Parkinson Disease | Tensor Imaging | White Matter | Dki Dti | Conventional Diffusion
      KOL-Index: 9086

      PURPOSE: Previous studies suggest that compression and stretching of the corticospinal tract (CST) potentially cause treatable gait disturbance in patients with idiopathic normal pressure hydrocephalus (iNPH). Measurement of axon diameter with diffusion MRI has recently been used to investigate microstructural alterations in neurological diseases. In this study, we investigated alterations in the axon diameter and intra-axonal fraction of the CST in iNPH by q-space imaging (QSI) ...

      Known for Axon Diameter | Corticospinal Tract | Normal Pressure | Volume Fraction | Patients Inph
      KOL-Index: 8369

      PURPOSE: Diffusional kurtosis imaging (DKI) is an emerging technique that describes diffusion of water molecules in terms of deviation from Gaussian distribution. This study investigated correlations between DKI metrics and cognitive function in patients with idiopathic normal pressure hydrocephalus (iNPH).

      MATERIALS AND METHODS: DKI was performed in 29 iNPH patients and 14 age-matched controls. Mini-mental state examination (MMSE), frontal assessment battery (FAB), and trail making test ...

      Known for Cognitive Impairment | Diffusional Kurtosis Imaging | Normal Pressure | Mmse Fab | White Matter
      KOL-Index: 8330

      PURPOSE: The purpose of the present retrospective study was to evaluate the sensitivity of susceptibility-weighted imaging (SWI) compared to conventional spin-echo T2-weighted and T2*-weighted images in detecting iron deposition in the motor cortex of amyotrophic lateral sclerosis (ALS) patients in comparison with age-matched normal controls. We also investigated the etiology of the low signal referring to the pathology of one autopsy case.

      METHODS: This retrospective magnetic resonance ...

      Known for Motor Cortex | Lateral Sclerosis | Image Interpretation | Signal Intensity | Weighted Imaging
      KOL-Index: 8070

      Mapping of MR fiber g-ratio, which is the ratio of the diameter of the axon to the diameter of the neuronal fiber, is introduced in this article. We investigated the MR fiber g-ratio, the axon volume fraction (AVF) and the myelin volume fraction (MVF) to evaluate microstructural changes in the spinal cord in patients with cervical spondylotic myelopathy (CSM) in vivo, using atlas-based analysis. We used diffusion MRI data acquired with a new simultaneous multi-slice accelerated ...

      Known for Spinal Cord | Cervical Spondylotic Myelopathy | Patients Csm | Imaging Diffusion | Axon Volume Fraction
      KOL-Index: 7868

      PURPOSE: To elucidate differences between glioblastoma (GBM) and primary central nervous system lymphoma (PCNSL) with MR image-based texture features.

      METHODS: This was an Institutional Review Board (IRB)-approved retrospective study. Consecutive, pathologically proven, initially treated 44 patients with GBM and 16 patients with PCNSL were enrolled. We calculated a total of 67 image texture features on the largest contrast-enhancing lesion in each patient on post-contrast T1-weighted ...

      Known for Texture Analysis | Gbm Pcnsl | Central Nervous | Gray Level | Image Based
      KOL-Index: 7636

      Major depressive disorder (MDD) is a globally prevalent psychiatric disorder that results from disruption of multiple neural circuits involved in emotional regulation. Although previous studies using diffusion tensor imaging (DTI) found smaller values of fractional anisotropy (FA) in the white matter, predominantly in the frontal lobe, of patients with MDD, studies using diffusion kurtosis imaging (DKI) are scarce. Here, we used DKI whole-brain analysis with tract-based spatial ...

      Known for White Matter | Kurtosis Imaging | Major Depressive Disorder | Corpus Callosum | Frontal Lobe
      KOL-Index: 6913

      INTRODUCTION: Diffusion tensor imaging (DTI) reveals white matter pathology in patients with multiple sclerosis (MS). A recent non-Gaussian diffusion imaging technique, q-space imaging (QSI), may provide several advantages over conventional MRI techniques in regard to in vivo evaluation of the disease process in patients with MS. The purpose of this study is to investigate the use of root mean square displacement (RMSD) derived from QSI data to characterize plaques, periplaque white ...

      Known for Multiple Sclerosis | White Matter | Space Imaging | Qsi Data | Diffusion Tensor
      KOL-Index: 6890

      Arterial spin labeling (ASL) is a noninvasive technique that can measure cerebral blood flow (CBF). To our knowledge, there is no study that examined regional CBF of multiple sclerosis (MS) patients by using this technique. The present study assessed the relationship between clinical presentations and functional imaging data in MS using pseudocontinuous arterial spin labeling (pCASL). Twenty-seven patients with MS and 24 healthy volunteers underwent magnetic resonance imaging and pCASL ...

      Known for Multiple Sclerosis | Cerebral Blood Flow | Arterial Spin Labeling | Spin Labels | Cbf Asl

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      Department of Diagnostic Radiology, Toho University Omori Medical Center | Department of Radiology, Juntendo University School of Medicine, Tokyo, Japan | Department of Radiology, Toho University, Tokyo, Japan | Department of Radiology, Juntendo Univ

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