Shunrou Fujiwara

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PURPOSE To determine whether and to what degree absolute apparent diffusion coefficient (ADC) values vary between different imagers, vendors, field strengths, and intraimager conditions. MATERIALS AND METHODS Informed consent and institutional review board approval were obtained. Diffusion-weighted (DW) images with nearly identical parameters were(More)
The aim of this study was to clarify the reliability of positron emission tomography (PET) using a new hypoxic cell tracer, 1-(2-[18F]fluoro-1-[hydroxymethyl]ethoxy)methyl-2-nitroimidazole (18F-FRP170). Twelve patients with glioblastoma underwent 18F-FRP170 PET before tumor resection. Mean standardized uptake value (SUV) and normalized SUV were calculated(More)
We attempted to assess the feasibility of a 1.6-mm isotropic voxel diffusion tensor imaging (DTI) tractography at 3T in visualizing nerve bundles in the limbic system. We examined 20 healthy volunteers by conventional DTI with a voxel size of 1.6 × 1.6 × 3.0 mm and by high-resolution DTI with a voxel size of 1.6 × 1.6 × 1.6 mm and generated tractographs of(More)
PURPOSE We used a whole-brain, isotropic-voxel acquisition technique to improve the geometric distortion in diffusion-weighted (DWI) and diffusion tensor imaging (DTI) in coronal directions, which is remarkable at high magnetic fields. MATERIALS AND METHODS We performed magnetic resonance imaging of 17 healthy volunteers using a 3T scanner and obtained(More)
Brain temperature (BT) is associated with the balance between cerebral blood flow and metabolism according to the “heat-removal” theory. The present study investigated whether BT is abnormally altered in acute and subacute CO-poisoned patients by using 1H-magnetic resonance spectroscopy (MRS). Eight adult CO-poisoned patients underwent 3-T magnetic(More)
The authors report the results of microsurgical management of 209 cases of ruptured intracranial aneurysms. The outcome of the surgery is discussed from the point of view of operative timing, preoperative grade, age and the effect of vasospasm. The operative results at the time of discharge were as follows: 137 excellent cases, 18 good, 31 fair, 8 poor and(More)
PURPOSE To develop computer-assisted image processing to identify the central sulcus from the MRI data sets in patients with brain tumors. MATERIALS AND METHODS All MR images were acquired with a 3.0 Tesla scanner by three-dimensional (3D) spoiled gradient recalled acquisition using the steady state (SPGR) gradient-echo sequence and short inversion time(More)
OBJECTIVE The aim of the present study was to determine whether early and late/early images on 123I-iomazenil (IMZ) single-photon emission computed tomography (SPECT) correlate with cerebral blood flow (CBF) images and oxygen extraction fraction (OEF) images on PET, respectively, in the cerebral cortex of patients with chronic unilateral middle cerebral(More)
The anteromedial superior cerebellar tumor can be accessed by various routes. For tumor presenting at the cerebellar surface in this region, the optimal approach remains contentious. Furthermore, which of the various routes offers the optimal approach to a tumor that is not present at the cerebellar surface but lies deep anteromedial superior cerebellum is(More)