A5017521255- Advanced MRI Techniques and Applications
- Fuel Cells and Related Materials
- Atomic and Subatomic Physics Research
- NMR spectroscopy and applications
- Advanced NMR Techniques and Applications
- Spectroscopy and Chemometric Analyses
- Advanced Battery Materials and Technologies
- Cryospheric studies and observations
- Winter Sports Injuries and Performance
- Advancements in Solid Oxide Fuel Cells
- Electrocatalysts for Energy Conversion
- Conducting polymers and applications
- Analytical Chemistry and Sensors
- Advancements in Battery Materials
- Plant Water Relations and Carbon Dynamics
- Magnetic Properties of Alloys
- Advanced Neuroimaging Techniques and Applications
- Tree-ring climate responses
- Medical Imaging Techniques and Applications
- Bone health and osteoporosis research
- Lower Extremity Biomechanics and Pathologies
- Magnetic and Electromagnetic Effects
- Osteoarthritis Treatment and Mechanisms
- Magnetic properties of thin films
- Solid-state spectroscopy and crystallography
International University of Health and Welfare
2021-2024
National Cancer Center
2022
University of Tsukuba
1997-2021
Japan Agency for Medical Research and Development
2021
Keio University
2004-2017
The University of Tokyo
2011
National Agriculture and Food Research Organization
2011
Kyushu University
2011
Komazawa University
2011
University of Tokyo Hospital
2010-2011
Stokes radius (dynamic ionic radius) of the alkali metal ions <italic>versus</italic> (<italic>R</italic><sub>ion</sub>) at 303 K. The dotted line is a guide for 1 : relation.
We have developed the first magnetic resonance (MR) microscope using a high critical-temperature superconducting bulk magnet. The magnet comprises six annular superconductors (60 mm outer diameter, 28 inner 20 high) made of c-axis oriented single-domain EuBa2Cu3Oy crystals. was energized NMR operating at 4.7 T. inhomogeneity trapped field measured with MR imaging 3.1 ppm (rms) in ϕ6.2 mm×9.1 cylindrical region. Three-dimensional images chemically fixed mouse embryo acquired voxels (50 μm)3...
By combining a 0.3 T permanent magnet with flexible rotation and translation mechanism, probe local electromagnetic shielding, several electrical units, mobile lift, an electric wagon, magnetic resonance imaging (MRI) system was developed for outdoor tree measurements. 2D cross-sectional images of normal diseased branches pear were acquired measurements T(1), T(2), proton density, apparent diffusion constant (ADC). The ADC map clearly differentiated from branches. A whole-day measurement the...
In pine wilt disease (PWD), embolized tracheids arise after virulent wood nematodes (PWN), Bursaphelenchus xylophilus, invade the resin canal of tree; infected trees finally die from significant loss xylem water conduction. We used a compact magnetic resonance imaging system with U-shaped radio frequency (rf) probe coil to reveal developmental process dysfunction in PWD. Multiple cross-sectional slices along stem axis were acquired periodically monitor total distribution each 1-year-old main...
Abstract Development of xylem embolism during water stress in two diffuse‐porous hardwoods, K atsura ( C ercidiphyllum japonicum ) and J apanese white birch B etula platyphylla var. japonica ), was observed non‐destructively under a compact magnetic resonance imaging MRI system addition to conventional quantitation hydraulic vulnerability cavitation from excised stem segments. Distribution dark areas MR images corresponded well the distribution water‐filled/embolized vessels by cryo‐scanning...
Mobile lithium ions in a cubic garnet Li7La3Zr2O12 (Al-stabilized) were studied using 7Li NMR spectroscopy for membrane and powder samples, the latter of which was ground from membrane. Lithium diffusion micrometer space measured pulsed-gradient spin-echo method between 70 130 °C. When observation time (Δ) shorter than 20 ms, echo attenuation showed diffusive diffraction patterns, indicating that Li+ diffusing is not free but restricted. For longer Δ, values apparent constant (Dapparent)...
Abstract A super‐parallel MR microscope in which multiple (up to 100) samples can be imaged simultaneously at high spatial resolution is described. The system consists of a multichannel transmitter–receiver and gradient probe array housed large‐bore magnet. An eight‐channel was constructed for verification the concept, four‐channel practical application. Eight chemically fixed mouse fetuses were 200 μm 3 voxel 1.5 T superconducting magnet whole‐body MRI, four human embryos 120 2.35 Although...
Abstract Morphogenesis in the developing embryo takes place three dimensions, and addition, dimension of time is another important factor development. Therefore, presentation sequential morphological changes occurring (4D visualization) essential for understanding complex morphogenetic events underlying mechanisms. Until recently, 3D visualization embryonic structures was possible only by reconstruction from serial histological sections, which tedious time‐consuming. During past two decades,...
Using 4 and 8-channel super-parallel magnetic resonance (MR) microscopes with a horizontal bore 2.34T superconducting magnet developed for 3-dimensional MR microscopy of the large Kyoto Collection Human Embryos, we acquired T(1)-weighted 3D images 1204 embryos at spatial resolution (40 microm)(3) to (150 in about 2 years. Similarity image contrast between stained anatomical sections indicated that could be used an database human embryology.
It is essential to visualize the structures of embryos and their internal organs three-dimensionally analyze morphogenesis; this used rely solely on serial histological sectioning solid reconstruction, which were tedious time-consuming. We have applied imaging with a magnetic resonance (MR) microscope equipped 2.35 T superconducting magnet human embryos; we successful in acquiring high-resolution sectional images identifying detailed major organs. The process was facilitated by using...
Li-diffusion constants of single-crystal and powder garnets were determined plotted <italic>versus</italic> ionic conductivity. Estimated NE carrier numbers larger than atomic Li for metal containing insensitive to temperature.
A dedicated magnetic resonance imaging (MRI) apparatus that is small, lightweight, and usable in an ordinary research room was devised for developmental quality estimation of foods agricultural products. The thawing processes frozen margarine meats were traced, the distributions oils adipose tissue (fat) water muscle pork beef distinctively visualised, oil-accumulating tissues seeds sticky materials on surface fermented soybeans (natto) characterised, three-dimensional organisation fine...
Infestation of harvested apple fruits by the peach fruit moth (Carposina sasakii Matsumura) was studied using a dedicated magnetic resonance imaging (MRI) apparatus equipped with 0.2-T permanent magnet. Infested holes on three-dimensional (3-D) images tracked ecological movements larvae within food fruits, and thus in their natural habitat. Sensitive short solenoid coil surface detectors were devised to shorten measurement times. The detected infestation at rate 6.4 s per image single-slice...
We have developed a pulse programmer for magnetic resonance imaging (MRI) using personal computer and commercially available high-speed digital input-output board. The software the was C∕C++ .NET Framework 2.0 running under Windows 7 operating system. connected to MRI transceiver 32-bit parallel interface, 128-bit data (16 bits × 8 words) sequence digitally detected signal were transferred bi-directionally every 1 μs. performance of evaluated 1.0 T permanent magnet acquired MR images...
We critically evaluated analog and digital transceivers for magnetic resonance (MR) imaging systems under identical experimental conditions to identify compare their advantages disadvantages. MR experiments were performed using a 4.74-tesla vertical-bore superconducting magnet high sensitivity gradient coil probe. acquired 3-dimensional spin echo images of kumquat with without gain-stepping scan technique extend the dynamic range receiver systems. The clearly demonstrated nearly image...
Although previous studies have suggested that branch dieback and whole-plant death due to drought stress occur at 50–88% loss of stem hydraulic conductivity (P 50 P 88 , respectively), the dynamics catastrophic failure in water-conducting pathways whole plants subjected remain poorly understood. We examined tolerance 3-year-old Japanese black pine ( Pinus thunbergii Parl.). nondestructively monitored (i) spatial distribution drought-induced embolisms greater than (ii) recovery from following...
Abstract A compact MRI system for measuring trabecular bone volume fraction (TBVF) of the calcaneus was developed with use a 0.21 T permanent magnet and portable console. The entire weighed < 600 kg installed in 2 m × space. Two cross‐sectional spin‐echo images heel acquired external reference phantoms (total measurement time = 5 min) were used to quantify TBVF calcaneus. linearity reproducibility measurements evaluated by means proton density‐adjusted phantoms. Comparative quantitative...
Abstract Purpose To investigate the feasibility of an originally developed compact MRI system for evaluating rheumatoid arthritis (RA), and determine its advantages disadvantages as imaging modality RA. Materials Methods We prospectively studied 13 healthy controls with no clinical symptoms arthritis, patients hand wrist pains (including pain from RA) a 0.2 T permanent‐magnet MR imager. All images were obtained while subjects in sitting position. Coronal three‐dimensional spin‐echo...