Details of the Researcher

PHOTO

Parajuli Raj Kumar
Section
Graduate School of Dentistry
Job title
Assistant Professor
Degree

  • Doctoral (Gunma University)

  • Masters (Gunma University)

  • Bachelor (Tribhuwan University)

Research History 5

  • 2023/06 - Present
    The University of Sydney　Sydney Imaging Core Research Facility

  • 2019/07 - 2026/05
    Gunma University　Heavy Ion Medical Center　Collaborative Researcher

  • 2019/07 - 2026/05
    National Institutes for Quantum and Radiological Science and Technology　Department of Molecular Imaging and Theranostics (MIT)　Pre-Clinical MRI Technologist and Researcher

  • 2016/04 - 2019/06
    Gunma University　Gunma University Initiative for Advanced Research - Gunma University Heavy Ion Medical Center　Researcher

  • 2015/10 - 2016/03
    Gunma University　Gunma University Human Resourses Cultivation Center　Research Assistant

Education 2

  • Gunma University　Electronics and Computing　Doctoral Course (Ph.D)

    - 2016/03

  • Gunma University　Electronics Engineering　Master of Engineering

    - 2012/03

Research Interests 4

  • Signal Processing

  • Medical Physics

  • Medical Imaging

  • Radiation Measurement

Research Areas 4

  • Life sciences / Medical systems /

  • Nanotechnology/Materials / Applied physics - general /

  • Natural sciences / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics /

  • Energy / Quantum beam science /

Awards 1

  1. Nepal Bidhya Bhusan Award and Gold Medal

    2017/09　Gunma University

Papers 28

  1. Quantification of Oxygenation and Oxygen Consumption Rates in the Mouse Brain Based on Tissue Oxygen Level-Dependent (TOLD) MRI Peer-reviewed

    Raj Kumar Parajuli, Hiromi Sano, Megumi Ueno, Shan Gao, Saaya Suzuki, Akira Sumiyoshi, Kensuke Osada, Takayuki Obata, Ichio Aoki, Ken-ichiro Matsumoto

    2025/07

    DOI： 10.1002/nbm.70104 　

  2. Effects of 2 Gy × 20 fractionated X-ray irradiation on the redox metabolic activity in mouse colorectum tissue Peer-reviewed

    Megumi Ueno, Raj Kumar Parajuli, Hiromi Sano, Shan Gao, Ken-ichiro Matsumoto, Kensuke Osada, Takayuki Obata, Ichio Aoki, Akira Sumiyoshi

    Free Radical Biology and Medicine　224　S10-S10　2024/11

    Publisher: Elsevier BV

    DOI： 10.1016/j.freeradbiomed.2024.10.015 　

    ISSN： 0891-5849

  3. Experimental study on Compton camera for boron neutron capture therapy applications Peer-reviewed

    M. Sakai, S. Tamaki, I. Murata, R. K. Parajuli, A. Matsumura, N. Kubo, M. Tashiro

    Scientific Reports　13　(1)　2023/12/18

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41598-023-49955-9 　

    eISSN： 2045-2322

    More details Close

    Abstract Boron neutron capture therapy (BNCT) is a high-dose-intensive radiation therapy that has gained popularity due to advancements in accelerator neutron sources. To determine the dose for BNCT, it is necessary to know the difficult-to-determine boron concentration and neutron fluence. To estimate this dose, we propose a method of measuring the prompt γ-rays (PGs) from the boron neutron capture reaction (BNCR) using a Compton camera. We performed a fundamental experiment to verify basic imaging performance and the ability to discern the PGs from 511 keV annihilation γ-rays. A Si/CdTe Compton camera was used to image the BNCR and showed an energy peak of 478 keV PGs, separate from the annihilation γ-ray peak. The Compton camera could visualize the boron target with low neutron intensity and high boron concentration. This study experimentally confirms the ability of Si/CdTe Compton cameras to image BNCRs.

  4. Effects of X-ray irradiation on the redox status of mouse colorectal tissues Peer-reviewed

    Megumi Ueno, Raj Kumar Parajuli, Hiromu Ito, Megumi Iiyama, Saaya Suzuki, Ken-ichiro Matsumoto, Ikuo Nakanishi, Ichio Aoki, Akira Sumiyoshi

    Advances in Redox Research　100067-100067　2023/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.arres.2023.100067 　

    ISSN： 2667-1379

  5. Development and Applications of Compton Camera-A Review. International-journal Peer-reviewed

    Raj Kumar Parajuli, Makoto Sakai, Ramila Parajuli, Mutsumi Tashiro

    Sensors (Basel, Switzerland)　22　(19)　2022/09/28

    DOI： 10.3390/s22197374 　

    More details Close

    The history of Compton cameras began with the detection of radiation sources originally for applications in astronomy. A Compton camera is a promising γ-ray detector that operates in the wide energy range of a few tens of keV to MeV. The γ-ray detection method of a Compton camera is based on Compton scattering kinematics, which is used to determine the direction and energy of the γ-rays without using a mechanical collimator. Although the Compton camera was originally designed for astrophysical applications, it was later applied in medical imaging as well. Moreover, its application in environmental radiation measurements is also under study. Although a few review papers regarding Compton cameras have been published, they either focus very specifically on the detectors used in such cameras or the particular applications of Compton cameras. Thus, the aim of this paper is to review the features and types of Compton cameras and introduce their applications, associated imaging algorithms, improvement scopes, and their future aspects.

  6. Carbon range verification with 718 keV Compton imaging. International-journal Peer-reviewed

    Raj Kumar Parajuli, Makoto Sakai, Kazuo Arakawa, Yoshiki Kubota, Nobuteru Kubo, Mutsumi Tashiro

    Scientific reports　11　(1)　21696-21696　2021/11/04

    DOI： 10.1038/s41598-021-00949-5 　

    More details Close

    Carbon ion radiotherapy is a sophisticated radiation treatment modality because of its superiority in achieving precise dosage distribution and high biological effectiveness. However, there exist beam range uncertainties that affect treatment efficiency. This problem can be resolved if the clinical beam could be monitored precisely in real-time, such as by imaging the prompt gamma emission from the target. In this study, we performed real-time detection and imaging of 718 keV prompt gamma emissions using a Si/CdTe Compton camera. We conducted experiments on graphite phantoms using clinical carbon ion beams of 290 MeV/u energy. Compton images were reconstructed using simple back-projection methods from the energy events of 718 keV prompt gamma emissions. The peak intensity position in reconstructed 718 keV prompt gamma images was few millimeters below the Bragg peak position. Moreover, the dual- and triple-energy window images for all positions of phantoms were not affected by scattered gammas, and their peak intensity positions were approximately similar to those observed in the reconstructed 718 keV prompt gamma images. In conclusion, the findings of the current study demonstrate the feasibility of using our Compton camera for real-time beam monitoring of carbon ion beams under clinical beam intensity.

  7. Crosstalk Reduction Using a Dual Energy Window Scatter Correction in Compton Imaging. International-journal Peer-reviewed

    Makoto Sakai, Raj Kumar Parajuli, Yoshiki Kubota, Nobuteru Kubo, Mitsutaka Yamaguchi, Yuto Nagao, Naoki Kawachi, Mikiko Kikuchi, Kazuo Arakawa, Mutsumi Tashiro

    Sensors (Basel, Switzerland)　20　(9)　2020/04/26

    DOI： 10.3390/s20092453 　

    More details Close

    Compton cameras can simultaneously detect multi-isotopes; however, when simultaneous imaging is performed, crosstalk artifacts appear on the images obtained using a low-energy window. In conventional single-photon emission computed tomography, a dual energy window (DEW) subtraction method is used to reduce crosstalk. This study aimed to evaluate the effectiveness of employing the DEW technique to reduce crosstalk artifacts in Compton images obtained using low-energy windows. To this end, in this study, we compared reconstructed images obtained using either a photo-peak window or a scatter window by performing image subtraction based on the differences between the two images. Simulation calculations were performed to obtain the list data for the Compton camera using a 171 and a 511 keV point source. In the images reconstructed using these data, crosstalk artifacts were clearly observed in the images obtained using a 171 keV photo-peak energy window. In the images obtained using a scatter window (176-186 keV), only crosstalk artifacts were visible. The DEW method could eliminate the influence of high-energy sources on the images obtained with a photo-peak window, thereby improving quantitative capability. This was also observed when the DEW method was used on experimentally obtained images.

  8. Improved iterative reconstruction method for Compton imaging using median filter. International-journal Peer-reviewed

    Makoto Sakai, Raj Kumar Parajuli, Yoshiki Kubota, Nobuteru Kubo, Mikiko Kikuchi, Kazuo Arakawa, Takashi Nakano

    PloS one　15　(3)　e0229366　2020

    DOI： 10.1371/journal.pone.0229366 　

    More details Close

    A Compton camera is a device for imaging a radio-source distribution without using a mechanical collimator. Ordered-subset expectation-maximization (OS-EM) is widely used to reconstruct Compton images. However, the OS-EM algorithm tends to over-concentrate and amplify noise in the reconstructed image. It is, thus, necessary to optimize the number of iterations to develop high-quality images, but this has not yet been achieved. In this paper, we apply a median filter to an OS-EM algorithm and introduce a median root prior expectation-maximization (MRP-EM) algorithm to overcome this problem. In MRP-EM, the median filter is used to update the image in each iteration. We evaluated the quality of images reconstructed by our proposed method and compared them with those reconstructed by conventional algorithms using mathematical phantoms. The spatial resolution was estimated using the images of two point sources. Reproducibility was evaluated on an ellipsoidal phantom by calculating the residual sum of squares, zero-mean normalized cross-correlation, and mutual information. In addition, we evaluated the semi-quantitative performance and uniformity on the ellipsoidal phantom. MRP-EM reduces the generated noise and is robust with respect to the number of iterations. An evaluation of the reconstructed image quality using some statistical indices shows that our proposed method delivers better results than conventional techniques.

  9. Use of a Si/CdTe Compton Camera for In vivo Real-Time Monitoring of Annihilation Gamma Rays Generated by Carbon Ion Beam Irradiation. International-journal Peer-reviewed

    Shintaro Shiba, Raj Kumar Parajuli, Makoto Sakai, Takahiro Oike, Tatsuya Ohno, Takashi Nakano

    Frontiers in oncology　10　635-635　2020

    DOI： 10.3389/fonc.2020.00635 　

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    The application of annihilation gamma-ray monitoring to the adaptive therapy of carbon ion radiotherapy (C-ion RT) requires identification of the peak intensity position and confirmation of activated elements with annihilation gamma-rays generated at the C-ion-irradiated site from those transported to unirradiated sites. Real-time monitoring of C-ion-induced annihilation gamma-rays was implemented using a Compton camera in a mouse model. An adult C57BL/6 mouse was anesthetized, and C-ion beams were directed into the abdomen at 1 × 109 particles/s for 20 s. The 511 keV annihilation gamma-rays, generated by the interaction between the irradiated C-ion beam and the target mouse, were detected using a silicon/cadmium telluride (Si/CdTe) Compton camera for 20 min immediately after irradiation. The irradiated site and the peak intensity position of 511 keV gamma emissions due to C-ion beam irradiation on a mouse were observed at the abdomen of the mouse by developing Compton images. Moreover, the positron emitter transport was observed by evaluating the range of gamma-ray emission after the C-ion beam irradiation on the mouse. Our data suggest that by confirming the peak intensity and beam range of C-ion RT with Si/CdTe-based Compton camera, it would be possible to reduce the intra-fractional and inter-fractional dose distribution degradation. Therefore, the results of this study would contribute to the future development of adaptive therapy with C-ion RT for humans.

  10. Compton imaging with 99mTc for human imaging. International-journal Peer-reviewed

    Makoto Sakai, Yoshiki Kubota, Raj Kumar Parajuli, Mikiko Kikuchi, Kazuo Arakawa, Takashi Nakano

    Scientific reports　9　(1)　12906-12906　2019/09/09

    DOI： 10.1038/s41598-019-49130-z 　

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    We have been developing a medical imaging system using a Compton camera and demonstrated the imaging ability of Compton camera for 99mTc-DMSA accumulated in rat kidneys. In this study, we performed imaging experiments using a human body phantom to confirm its applicability to human imaging. Preliminary simulations were conducted using a digital phantom with varying activity ratios between the kidney and body trunk regions. Gamma rays (141 keV) were generated and detected by a Compton camera based on a silicon and cadmium telluride (Si/CdTe) detector. Compton images were reconstructed with the list mode median root prior expectation maximization method. The appropriate number of iterations of the condition was confirmed through simulations. The reconstructed Compton images revealed two bright points in the kidney regions. Furthermore, the numerical value calculated by integrating pixel values inside the region of interest correlated well with the activity of the kidney regions. Finally, experimental studies were conducted to ascertain whether the results of the simulation studies could be reproduced. The kidneys could be successfully visualised. In conclusion, considering that the conditions in this study agree with those of typical human bodies and imaginable experimental setup, the Si/CdTe Compton camera has a high probability of success in human imaging. In addition, our results indicate the capability of (semi-) quantitative analysis using Compton images.

  11. Annihilation Gamma Imaging for Carbon Ion Beam Range Monitoring using Si/CdTe Compton Camera International-journal Peer-reviewed

    Parajuli Raj Kumar

    Physics in Medicine & Biology　64　(055003)　055003-055003　2019/02

    Publisher: IOP Publishing

    DOI： 10.1088/1361-6560/ab00b2 　

    eISSN： 1361-6560

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    In this study, we performed on-beam monitoring of 511 keV annihilation gamma emissions using a Compton camera. Beam monitoring experiments were conducted using carbon ion beams of 290 MeV/u irradiated on a polymethyl methacrylate (PMMA) phantom. The intensity of the beams was 3  ×  109 particles per pulse, with 20 pulses per minute. A Compton camera based on a silicon/cadmium telluride (Si/CdTe) detector was used to monitor the annihilation gamma rays emitted from the phantom. We successfully reconstructed the energy events of 511 keV annihilation gamma rays and developed Compton images using a simple back-projection method. The distribution of the annihilation gamma ray generation traced the beam trajectory and the peak intensity position was a few millimeters shorter than the Bragg peak position. Moreover, the effect of the beam range shifter with 30, 60, and 90 mm water equivalent thickness (WET) was clearly visualized in the reconstructed Compton images. The experimentally measured values of the corresponding range shifts in the PMMA phantom (28.70 mm, 52.49 mm, and 76.77 mm, respectively) were consistent with the shifts of the Bragg peak position (25.50 mm, 51.30 mm and 76.70 mm, respectively) evaluated by Monte Carlo simulation. The results show that the Si/CdTe Compton camera has strong potential for on-beam monitoring of annihilation gamma rays in particle therapy in clinical situations.

  12. Effect of Number of Views on Cross-sectional Compton Imaging: A Fundamental Study with Backprojection International-journal Peer-reviewed

    Parajuli Raj Kumar

    Physica Medica　56　1-9　2018/11

    Publisher: Elsevier BV

    DOI： 10.1016/j.ejmp.2018.11.006 　

    ISSN： 1120-1797

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    INTRODUCTION: We have been developing a medical imaging technique using a Compton camera, which is expected to reconstruct three-dimensional images. If the number of views is not sufficient, star-shaped artifacts (streak artifacts) could arise in cross-sectional images. Therefore, we estimated the point spread function (PSF) of cross-sectional Compton images and the effect of the number of views by Monte Carlo simulations and experimental studies. MATERIALS AND METHODS: A cross-sectional Compton image was reconstructed using a dataset comprising 719 view directions and PSF was analyzed using a radial distribution. The peak height, full width at half maximum (FWHM), background (BG), and residual sum of squares (RSS) were calculated from the obtained PSF. In addition, RSSs were plotted against the number of views to estimate the required number to suppress star-shaped artifacts. RESULTS: There was no correlation found between the number of views and both FWHM (16 mm) and peak/BG ratio (∼1 × 104). RSSs were reduced with the number of views and approached the minimum asymptotically. Correlation was observed between the required number of views and the number of Compton events used for image reconstruction. CONCLUSION: We determined the PSF of cross-sectional Compton images and the effect of the number of views on the images. The required number of views to suppress the star-shaped artifact is related to the square root of the number of Compton events used to reconstruct the image. From this study, we concluded that 21 or more views are required for clinical purposes.

  13. Evaluation of Scintillation Properties of α- and β-SiAlON phosphors under focused microbeam irradiation using ion-beam-induced luminescence analysis Peer-reviewed

    Parajuli Raj Kumar

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms　450　157-162　2018/09

    DOI： 10.1016/j.nimb.2018.09.002 　

    ISSN： 0168-583X

  14. Imaging of monochromatic beams by measuring secondary electron bremsstrahlung for carbon-ion therapy using a pinhole x-ray camera International-journal Peer-reviewed

    Mitsutaka Yamaguchi, Yuto Nagao, Koki Ando, Seiichi Yamamoto, Makoto Sakai, Raj Kumar Parajuli, Kazuo Arakawa, Naoki Kawachi

    Physics in Medicine and Biology　63　(4)　045016-045016　2018/02/15

    Publisher: Institute of Physics Publishing

    DOI： 10.1088/1361-6560/aaa17c 　

    ISSN： 1361-6560 0031-9155

  15. Micro-PIXE analysis and imaging of radio-photoluminescence glass bead microdosimeters Peer-reviewed

    S. Kawabata, W. Kada, Y. Matsubara, T. Satoh, M. Sakai, R. K. Parajuli, N. Yamada, M. Koka, K. Miura, O. Hanaizumi, T. Kamiya

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS　406　139-143　2017/09

    DOI： 10.1016/j.nimb.2017.04.017 　

    ISSN： 0168-583X

    eISSN： 1872-9584

  16. Development of a high-speed wavelength-dispersive IBIL analysis and imaging system using a multi-channel photon-counting spectrometer Peer-reviewed

    Wataru Kada, Shunsuke Kawabata, Takahiro Satoh, Raj Kumar Parajuli, Naoto Yamada, Masashi Koka, Kenta Miura, Osamu Hanaizumi, Tomihiro Kamiya

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS　406　124-129　2017/09

    DOI： 10.1016/j.nimb.2017.03.056 　

    ISSN： 0168-583X

    eISSN： 1872-9584

  17. Observation of changes in ion beam induced luminescence spectra from organics during focused microbeam irradiation Peer-reviewed

    Wataru Kada, Shunsuke Kawabata, Takahiro Satoh, Makoto Sakai, Raj Kumar Parajuli, Naoto Yamada, Masashi Koka, Kenta Miura, Osamu Hanaizumi, Tomihiro Kamiya

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS　404　100-105　2017/08

    DOI： 10.1016/j.nimb.2017.01.025 　

    ISSN： 0168-583X

    eISSN： 1872-9584

  18. Microfabrication of embedded optical waveguide struture in flexible electrical circuit substrate by proton beam writing (PBW) procedure

    Takahashi Ryuhei, Miura Satoshi, Saruya Ryota, Kawabata Shunsuke, Miura Kenta, Kada Wataru, Koka Masashi, Satoh Takahiro, Koka Tomihiro, Hanaizumi Osamu, Parajuli Kumar

    JSAP Annual Meetings Extended Abstracts　2016.2　1607-1607　2016/09/01

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2016.2.0_1607 　

    eISSN： 2436-7613

  19. Fabrication of Flexible Mach–Zehnder Interferometer embedded in PDMS thins Film using Focused Proton Microbeam

    Miura Satoshi, Saruya Ryota, Kawabata Shunsuke, Miura Kenta, Kada Wataru, Koka Masashi, Sato Takahiro, Kamiya Tomihiro, Parajuli Raj Kumar, Hanaizumi Osamu

    JSAP Annual Meetings Extended Abstracts　2016.2　1608-1608　2016/09/01

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2016.2.0_1608 　

    eISSN： 2436-7613

  20. In situ ion-beam-induced luminescence analysis for evaluating a micrometer-scale radio-photoluminescence glass dosimeter Peer-reviewed

    Shunsuke Kawabata, Wataru Kada, Raj Kumar Parajuli, Yoshinori Matsubara, Makoto Sakai, Kenta Miura, Takahiro Satoh, Masashi Koka, Naoto Yamada, Tomihiro Kamiya, Osamu Hanaizumi

    JAPANESE JOURNAL OF APPLIED PHYSICS　55　(6)　06GD03.1‐06GD03.4　2016/06

    DOI： 10.7567/JJAP.55.06GD03 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  21. Fabrication and evaluation of flexible Mach-Zehnder waveguide structure embedded in a poly(dimethylsiloxane) thin film using a proton microbeam Peer-reviewed

    Raj Kumar Parajuli, Ryota Saruya, Naoki Akutzu, Satoshi Miura, Wataru Kada, Shunsuke Kawabata, Yoshinori Matsubara, Takahiro Satoh, Masashi Koka, Naoto Yamada, Tomihiro Kamiya, Kenta Miura, Osamu Hanaizumi

    JAPANESE JOURNAL OF APPLIED PHYSICS　55　(6)　06GD01.1‐06GD01.5　2016/06

    DOI： 10.7567/JJAP.55.06GD01 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  22. Development of Ion Microbeam Induced Luminescence Analysis Technique for the visualization of microscopic chemical composition in mineral targets Peer-reviewed

    第12巻　(第1/2号)　5-9　2016

    Publisher:

    ISSN： 2432-1109

  23. Ion-Beam-Induced Luminescence Analysis of beta-SiAlON:Eu Scintillator under Focused Microbeam Irradiation Peer-reviewed

    Raj Kumar Parajuli, Wataru Kada, Shunsuke Kawabata, Yoshinori Matsubara, Makoto Sakai, Kenta Miura, Takahiro Satoh, Masashi Koka, Naoto Yamada, Tomihiro Kamiya, Osamu Hanaizumi

    SENSORS AND MATERIALS　28　(8)　837-844　2016

    DOI： 10.18494/SAM.2016.1242 　

    ISSN： 0914-4935

  24. Evaluation of radio-photoluminescence spectra of copper-doped phosphate glass dosimeter irradiated with ionized particles

    Raj Kumar Parajuli, Wataru Kada, Shunsuke Kawabata, Yoshinori Matsubara, Kenta Miura, Akihito Yokoyama, Moriyoshi Haruyama, Makoto Sakai, Osamu Hanaizumi

    Key Engineering Materials　698　163-170　2016

    Publisher: Trans Tech Publications Ltd

    DOI： 10.4028/www.scientific.net/KEM.698.163 　

    ISSN： 1013-9826

  25. Characterization of nonlinearity of shear elasticity using local velocity mapping Peer-reviewed

    Raj Kumar Parajuli, Naoki Sunaguchi, Reisen Tei, Tomohiro Iijima, Yoshiki Yamakoshi

    JAPANESE JOURNAL OF APPLIED PHYSICS　53　(7)　2014/07

    DOI： 10.7567/JJAP.53.07KF30 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  26. Shear wave imaging using phase modulation component of harmonic distortion in continuous shear wave excitation Peer-reviewed

    Raj Kumar Parajuli, Reisen Tei, Daisuke Nakai, Yoshiki Yamakoshi

    Japanese Journal of Applied Physics　52　(7)　07HF22.1-07HF22.6　2013/07

    DOI： 10.7567/JJAP.52.07HF22 　

    ISSN： 0021-4922 1347-4065

  27. Tissue Viscoelasticity Measurement System by Simultaneous Multiple-Frequency Excitation Peer-reviewed

    Takashi Miwa, Yuki Yoshihara, Kouki Kanzawa, Raj Kumar Parajuli, Yoshiki Yamakoshi

    JAPANESE JOURNAL OF APPLIED PHYSICS　51　(7)　07GF13.1-07GF13.5　2012/07

    DOI： 10.1143/JJAP.51.07GF13 　

    ISSN： 0021-4922

  28. Shear Wave Velocity Estimation by Virtual Sensing Array Spectrum Analysis Peer-reviewed

    Takashi Miwa, Raj Kumar Parajuli, Ryosuke Tomizawa, Yoshiki Yamakoshi

    JAPANESE JOURNAL OF APPLIED PHYSICS　50　(7)　07HF07.1-07HF07.9　2011/07

    DOI： 10.1143/JJAP.50.07HF07 　

    ISSN： 0021-4922

Show all ︎Show first 5

Misc. 2

  1. 簡便な3次元線量分布計測を目的としたガラス線量計素子の製作と荷電粒子応答評価

    松原良典, 川端駿介, 川端駿介, PARAJULI Raj Kumar, 加田渉, 酒井真理, 三浦健太, 佐藤隆博, 江夏昌志, 山田尚人, 神谷富裕, 花泉修

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)　76th　2015

  2. イオンビーム誘起発光分析を利用したSiAlON蛍光体の放射線耐性評価

    PARAJULI Raj Kumar, 川端駿介, 川端駿介, 松原良典, 加田渉, 酒井真理, 三浦健太, 佐藤隆博, 江夏昌志, 山田尚人, 神谷富裕, 花泉修

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)　76th　2015

Presentations 13

  1. Evaluation of Radio-photoluminescence glass beads dosimeter using micro-PIXE analysis and imaging

    PARAJULI Raj Kumar, KADA Wataru, SAKAI Makoto, KAWABATA Shunsuke, MATSUBARA Yoshinori, KAMIYA Tomihiro, SATOH Takahiro, MIURA Kenta, HANAIZUMI Osamu

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)　2016/09/01

  2. Development of Ion Microbeam Induced Luminescence Analysis Technique for the visualization of microscopic chemical composition in mineral targets

    加田 渉, 川端 駿介, Parajuli Raj Kumar, 江夏 昌志, 山田 尚人, 横山 彰人, 佐藤 隆博, 三浦 健太, 神谷 富裕, 花泉 修

    社会地質学会誌 Geo-pollution science, medical geology and urban geology　2016

  3. Acquisition of Odd-Even Phase Modulated Harmonic Components in Evaluation of Nonlinearity of Shear Elasticity

    KUMAR Parajuli Raj

    群馬大学高度人材育成センター年報　2015/11

  4. Interpretation of Nonlinearity of Shear Elasticity

    PARAJULI Raj Kumar

    群馬大学高度人材育成センター年報　2015/01

  5. 2P2-8 Impact of odd-even phase modulated harmonic components in nonlinearity of shear elasticity(Poster Session)

    Parajuli Raj Kumar, Yamakoshi Yoshiki

    Proceedings of Symposium on Ultrasonic Electronics　2014/12/03

  6. Impact of odd-even phase modulated harmonic components in nonlinearity of shear elasticity

    PARAJULI Raj Kumar, YAMAKOSHI Yoshiki

    超音波エレクトロニクスの基礎と応用に関するシンポジウム講演予稿集　2014/12/03

  7. Characterization of nonlinearity of shear elasticity using local velocity mapping

    PARAJULI Raj Kumar, SUNAGUCHI Naoki, TEI Reisen, IIJIMA Tomohiro, YAMAKOSHI Yoshiki

    Jpn J Appl Phys　2014/07

  8. 2E5-2 Evaluation of Local Velocity Mapping for Nonlinearity of Shear Elasticity(Biomedical Ultrasound)

    Parajuli Raj Kumar, Sunaguchi Naoki, Tei Reisen, Iijima Tomohiro, Yamakoshi Yoshiki

    Proceedings of Symposium on Ultrasonic Electronics　2013/11/20

  9. Evaluation of Local Velocity Mapping for Nonlinearity of Shear Elasticity

    PARAJULI Raj Kumar, SUNAGUCHI Naoki, TEI Reisen, IIJIMA Tomohiro, YAMAKOSHI Yoshiki

    超音波エレクトロニクスの基礎と応用に関するシンポジウム講演予稿集　2013/11/20

  10. 2P5-5 Shear wave imaging using phase modulation component of harmonic distortion in continuous shear wave excitation(Poster Session)

    Parajuli Raj Kumar, Tei Reisen, Nakai Daisuke, Yamakoshi Yoshiki

    Proceedings of Symposium on Ultrasonic Electronics　2012/11/13

  11. Shear wave imaging using phase modulation component of harmonic distortion in continuous shear wave excitation

    PARAJULI Raj Kumar, TEI Reisen, NAKAI Daisuke, YAMAKOSHI Yoshiki

    超音波エレクトロニクスの基礎と応用に関するシンポジウム講演予稿集　2012/11/13

  12. 1J5-3 Tissue elasticity imaging based on wave number vector analysis for continuous vibration wave excitation(Medical Ultrasound)

    Miwa Takashi, Yoshihara Yuki, Kanzawa Kouki, Raj Kumar Parajuli, Nakai Daisuke, Yamakoshi Yoshiki

    Proceedings of Symposium on Ultrasonic Electronics　2011/11/08

  13. Tissue elasticity imaging based on wave number vector analysis for continuous vibration wave excitation

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    超音波エレクトロニクスの基礎と応用に関するシンポジウム講演予稿集　2011/11/08

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