A5052335551- Medical Imaging Techniques and Applications
- Advanced X-ray and CT Imaging
- Radiation Dose and Imaging
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Advanced Radiotherapy Techniques
- Supramolecular Chemistry and Complexes
- Dark Matter and Cosmic Phenomena
- Synthesis and Properties of Aromatic Compounds
- Porphyrin and Phthalocyanine Chemistry
- Surface Roughness and Optical Measurements
- Radiomics and Machine Learning in Medical Imaging
- Chemical Synthesis and Analysis
- Sensor Technology and Measurement Systems
- Radiation Detection and Scintillator Technologies
- High-Energy Particle Collisions Research
- Industrial Vision Systems and Defect Detection
- Molecular spectroscopy and chirality
- Photoacoustic and Ultrasonic Imaging
- Synthesis and Catalytic Reactions
- Microstructure and mechanical properties
- Laser-Ablation Synthesis of Nanoparticles
- Superconducting Materials and Applications
- Organometallic Complex Synthesis and Catalysis
- Advanced Image Processing Techniques
Waseda University
2019-2022
Osaka University
1996-2021
Yamagata University
2019
Hitachi (Japan)
2016
The KOTO collaboration has now carefully analyzed widely discussed preliminary data containing four signal events for a rare kaon decay---an excess suggesting physics beyond the Standard Model---and found that Model background are large enough to explain signal.
The KOTO (|$K^0$| at Tokai) experiment aims to observe the CP-violating rare decay |$K_L \rightarrow \pi ^0 \nu \bar {\nu }$| by using a long-lived neutral-kaon beam produced 30 GeV proton Japan Proton Accelerator Research Complex. |$K_L$| flux is an essential parameter for measurement of branching fraction. Three neutral modes, 3\pi ^0$|, 2\pi and 2\gamma $|, were used measure in line 2013 engineering run. A Monte Carlo simulation was estimate detector acceptance these decays. Agreement...
We searched for the $CP$-violating rare decay of neutral kaon, $K_{L} \to π^0 ν\overlineν$, in data from first 100 hours physics running 2013 J-PARC KOTO experiment. One candidate event was observed while $0.34\pm0.16$ background events were expected. set an upper limit $5.1\times10^{-8}$ branching fraction at 90\% confidence level (C.L.). An $3.7\times10^{-8}$ C.L. π^{0} X^{0}$decay also time, where $X^{0}$ is invisible particle with a mass 135 MeV/$c^{2}$.
In the present study, authors describe a system using optical and magnetic sensors to measure thickness of polymer sheets accurately. A newly developed planar error correction method used in manufacturing process sheet is also presented. The was drastically improved for precision measurement sheet, resulting /spl plusmn/1% or less. As result, we have succeeded produce with 300 mu/m at speed approximately 30 m/min.
Polymer sheets with foamed, multilayered, compounded, and perforated structures are in great demand for various applications, such as liquid-crystal displays, secondary cells, electronic circuit devices. A system magnetic optical sensing is developed to accurately measure the thickness of polymer during manufacturing. Use a calibration gauge drastically improves precision sheet-thickness measurement without need standard sheet. The calibrated shown maintain sheet 460 mum plusmn 0.7%...
We report the first search for $K_L \to \pi^0 \gamma$ decay, which is forbidden by Lorentz invariance, using data from 2016 to 2018 at J-PARC KOTO experiment. With a single event sensitivity of $(7.1\pm 0.3_{\rm stat.} \pm 1.6_{\rm syst.})\times 10^{-8}$, no candidate was observed in signal region. The upper limit on branching fraction set be $1.7\times 10^{-7}$ 90\% confidence level.
Abstract X-ray computed tomography (CT) has been widely used in medical diagnostic imaging. However, conventional, energy-integrated CT requires a high radiation dose and can only provide monochromatic images that cannot eliminate various artifacts. In contrast, photon-counting (PC-CT) provides low-dose multicolor imaging, which enables the identification of multiple contrast agents. PC-CT system, lack photon statistics, is also caused by image reconstruction limited energy band, severely...
The measurement of thickness various sheets, such as foamed, multi-layered, composited, and perforated sheets has increased in many different applications. present authors have developed a system which magnetic sensor an optical sensing are used to measure the sheets. However, it is important precisely during manufacturing process. In study, new for inspecting sheet realized results accurate measurements. With use calibration gauge, was found that measuring drastically improved inspection...
With the development of nuclear medicine diagnostics and treatment, demand for image processing techniques has been increasing. Although single photon emission computed tomography (SPECT) positron (PET) are most common, energy ranges they permit imaging limited to either below 300 keV or 511 gamma rays (PET). Recently, Compton cameras have attracted attention, owing their wide range, which stretches from a few hundred several MeV. In this study, we performed camera using four...
X-ray computed tomography (CT) is widely used for three-dimensional nondestructive imaging of the internal structure human body or industrial materials. For modern technology in medical field, dual-energy CT (DE-CT) with two types effective energy has generally been used. However, signals DE-CT are integrated and read out form a current. Thus, contamination dark noise significantly degrades such qualities as contrast, which causes large radiation dose to patients. In addition, little...