Prof. Toru Aoki Profile

Prof. Toru Aoki

Professor at Shizuoka Univ

SPIE Involvement:

Conference Program Committee | Author

Publications (75)

Proceedings Article | 9 October 2024 Presentation + Paper

Display and manipulation of x-ray CT tomograms according to the position of the practitioner's viewpoint using mixed reality

Hiroki Kase, Junichi Nishizawa, Katsuyuki Takagi, Katsumasa Nakamura, Toru Aoki

Proceedings Volume 13151, 131510I (2024) https://doi.org/10.1117/12.3027385

KEYWORDS: Mixed reality, X-rays, X-ray computed tomography, Head-mounted displays, Projection systems, X-ray imaging, Heart, Computed tomography, Arteries

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Proceedings Article | 9 October 2024 Presentation + Paper

Development of semiconductor radiation detectors using GaN

Kagemitsu Inaba, Kosuke Hida, Kohei Toyoda, Junichi Nishizawa, Katsuyuki Takagi, Hiroki Kase, Toru Aoki

Proceedings Volume 13151, 131510E (2024) https://doi.org/10.1117/12.3027915

KEYWORDS: Sensors, Gallium nitride, Diodes, X-rays, Semiconductors, X-ray detectors, Crystals, Solids, Signal to noise ratio, Gamma radiation

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As semiconductor radiation detectors, detectors with high sensitivity at high energy, such as cadmium telluride (CdTe), which we have reported for many years, have been mainly developed, but CdTe has a K-edge and its attenuation coefficient at low energy, around 30 keV or lower, becomes small. there is a need for semiconductor detectors made of other materials that can be used for low-energy applications such as mammography. We propose gallium nitride (GaN) as a new semiconductor detector material, aiming at a useful detector in the low-energy region targeting 17.5 keV, where characteristic x-rays are generated. GaN has also been studied for LED and power devices, and its excellent charge transfer characteristics have been demonstrated in practical applications. In order to investigate the feasibility of GaN as a semiconductor material for radiation detectors, we fabricated pn-type and pin-type GaN detectors and evaluated their current-voltage characteristics, capacitance-voltage characteristics, and x-ray response characteristics. From the results, diode characteristics were confirmed for both structures. However, the frequency dependence of the capacitance-voltage characteristics of the pn-type detector suggested that the pn-type detector had many internal defects in the crystal. In both structures, the detected current increased with x-ray irradiation, and the current increased linearly in the range of the measured dose rate. In the alpha-ray detection measurement at an incident energy of 3.6 MeV, the pin-type detector was found to be sensitive to alpha rays. However, the pn-type detector did not detect the pulse because the pulse was buried by fluctuations due to leakage current and thermal noise. It was also shown that the pin-type detector must have a small dark current to make gamma-ray detection measurements with low energy. The results show the feasibility of GaN as a semiconductor material for radiation detectors, and both the pn-type and pin-type detectors exhibit linear current increase in the x-ray response characteristics measurements, suggesting the feasibility of GaN as a storage-type x-ray detector. In addition, the pin-type detector showed pulses of alpha-rays, suggesting the feasibility of a photon-counting type detector for gamma-rays in the future.

Proceedings Article | 4 October 2024 Poster + Paper

Spectrometric properties of single and series-connected Cr/CdTe/Au Schottky-diode detectors

Valeriy Sklyarchuk, Volodymyr Gnatyuk, Toru Aoki

Proceedings Volume 13151, 131510K (2024) https://doi.org/10.1117/12.3027469

KEYWORDS: Sensors, Diodes, Cesium, Crystals, Spectroscopy, Gold, Chromium, Electrodes, Semiconductors, Energy efficiency

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Proceedings Article | 4 October 2024 Presentation

Large-area CdTe photon charge-counting x-ray FPDs of 4.5" square

Toru Aoki, Junichi Nishizawa, Tsuyoshi Terao, Taku Miyake, Akifumi Koike, Katsuyuki Takagi, Hiroki Kase, Katsumasa Nakamura, Hidenori Mimura

Proceedings Volume PC13151, PC1315102 (2024) https://doi.org/10.1117/12.3029951

KEYWORDS: X-rays, Metals, X-ray detectors, Sensors, Photonic integrated circuits, Photon counting, Photodetectors, Modulation transfer functions, Field programmable gate arrays, Double positive medium

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Proceedings Article | 4 October 2024 Poster

Fabrication of pn junction CdTe radiation detectors by thermal diffusion doping with electron beam

Junichi Nishizawa, Inaba Kagemitsu, Katsuyuki Takagi, Hiroki Kase, Toru Aoki

Proceedings Volume PC13151, PC131510G (2024) https://doi.org/10.1117/12.3027912

KEYWORDS: Doping, Electron beams, Diffusion, Sensors, Crystals, Laser irradiation, Laser crystals, Fabrication, Resistance, Gamma radiation

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Proceedings Article | 4 October 2023 Presentation

Pixel-by-pixel image correction using x-ray photon energy

Hiroki Kase, Kento Tabata, Junichi Nishizawa, Katsuyuki Takagi, Toru Aoki

Proceedings Volume PC12696, PC1269607 (2023) https://doi.org/10.1117/12.2677159

KEYWORDS: X-ray imaging, X-rays, Mixtures, Image storage, Semiconductors, X-ray technology, X-ray optics, X-ray detectors, Visible radiation, Scintillators

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Proceedings Article | 4 October 2023 Presentation

Single crystal diamond x-ray image sensor with photon-charge counting ROIC

Toru Aoki, Kohei Toyoda, Koji Koyama, Seong-Woo Kim, Junichi Nishizawa, Kento Tabata, Hiroki Kase, Katsuyuki Takagi, Keitaro Hitomi

Proceedings Volume PC12696, PC1269608 (2023) https://doi.org/10.1117/12.2681853

KEYWORDS: Diamond, X-ray imaging, Readout integrated circuits, X-rays, Photon counting, Crystals, Photonic crystals, Photodetectors, Image sensors, Time correlated photon counting

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Proceedings Article | 3 October 2023 Poster + Paper

Effect of the metal nature on the I-V characteristics of CdTe diodes for ionizing radiation detectors

Valeriy Sklyarchuk, Volodymyr Gnatyuk, Toru Aoki

Proceedings Volume 12696, 126960L (2023) https://doi.org/10.1117/12.2676538

KEYWORDS: Metals, Crystals, Gold, Semiconductors, Nickel, Chromium, Diodes, Aluminum, Dark current, Tungsten

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Proceedings Article | 14 June 2023 Presentation

X-ray energy discrimination imaging by photon counting and the effect of x-ray energy on conventional energy-integrated imaging

Toru Aoki, Hiroki Kase, Katsuyuki Takagi, Akifumi Koike, Kento Tabata, Junichi Nishizawa

Proceedings Volume 12531, 125310K (2023) https://doi.org/10.1117/12.2663822

KEYWORDS: X-ray imaging, X-rays, Photon counting, X-ray detectors, Sensors, Image sensors, Target detection, Semiconductors, Photodetectors, Perovskite

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Proceedings Article | 12 June 2023 Poster + Paper

Cross-sectional display system using AR (augmented reality), VR (virtual reality), and MR (mixed reality) for 3D x-ray CT inspection

Hiroki Kase, Junichi Nishizawa, Kento Tabata, Katsuyuki Takagi, Toru Aoki

Proceedings Volume 12538, 125381T (2023) https://doi.org/10.1117/12.2663569

KEYWORDS: Virtual reality, Augmented reality, Mixed reality, X-rays, 3D image processing, X-ray computed tomography, X-ray imaging, Infrared cameras, 3D displays, Motion controllers

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Proceedings Article | 4 October 2022 Paper

Features of electrical and spectrometric properties of series connected CdTe-based Schottky-diode x/gamma-ray detectors

Valeriy Sklyarchuk, Volodymyr Gnatyuk, Toru Aoki

Proceedings Volume 12241, 122410N (2022) https://doi.org/10.1117/12.2633457

KEYWORDS: Sensors, Crystals, Cesium, Americium, Diodes, Resistance, Spectroscopy, Capacitance, Semiconductors, Titanium

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Proceedings Article | 4 October 2022 Paper

Characterization of CdTe-based p-n junction-diode x/gamma-ray detectors formed by frontside laser irradiation

Volodymyr Gnatyuk, Olena Maslyanchuk, Oleksandr Kulyk, Sergiu Shishiyanu, Toru Aoki

Proceedings Volume 12241, 122410M (2022) https://doi.org/10.1117/12.2633410

KEYWORDS: Sensors, Crystals, Cesium, Annealing, Doping, Laser irradiation, Electrodes, Laser crystals, Diodes, Energy efficiency

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Proceedings Article | 21 December 2021 Paper

Performance of CdTe-based p-n junction-diode X/γ-ray detectors

Volodymyr Gnatyuk, Serhii Levytskyi, Olena Maslyanchuk, Oleksandr Kulyk, Toru Aoki

Proceedings Volume 12126, 1212614 (2021) https://doi.org/10.1117/12.2615569

KEYWORDS: Sensors, Crystals, Laser crystals, Doping, Diodes, Semiconductor lasers, Semiconductors, Cesium, Laser irradiation, Pulsed laser operation

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Proceedings Article | 21 December 2021 Paper

Crystal defects and charge collection in CdTe-based x- and gamma-ray detectors

O. Maslyanchuk, I. Fodchuk, M. Solovan, I. Boledzyuk, A. Kuzmin, V. Gnatyuk, T. Aoki

Proceedings Volume 12126, 121260K (2021) https://doi.org/10.1117/12.2615504

KEYWORDS: Sensors, Crystals, Diodes, Americium, Photons, Radioisotopes, Gold, Diffusion, Energy efficiency, X-rays

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Proceedings Article | 27 October 2021 Paper

On the possibility of visualization of relief of rough surfaces via laser induced thermal emission

Kateryna Zelenska, Olga Tkach, Serge Zelensky, Olexandr Kolesnik, Toru Aoki

Proceedings Volume 11927, 1192705 (2021) https://doi.org/10.1117/12.2616236

KEYWORDS: Carbon, Visualization, Pulsed laser operation, Surface roughness, Medical research, Computer simulations, Polymers, Lamps, Thermography, Laser marking

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Proceedings Article | 30 September 2021 Poster + Paper

Features of dark electrical conductivity of semi-insulating p-CdTe single crystals

Valeriy Sklyarchuk, Volodymyr Gnatyuk, Toru Aoki

Proceedings Volume 11838, 1183818 (2021) https://doi.org/10.1117/12.2594318

KEYWORDS: Crystals, Semiconductors, Diodes, Sensors, Resistance, Gold, Temperature metrology, Metals, Electric field sensors, Argon

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Proceedings Article | 1 September 2021 Presentation + Paper

Simplification of imaging system for estimating changes in image contrast due to different weighting of x-ray energy

Takumi Hotta, Katsuyuki Takagi, Takeru Goto, Akifumi Koike, Yukino Imura, Toru Aoki

Proceedings Volume 11838, 1183813 (2021) https://doi.org/10.1117/12.2596422

KEYWORDS: X-rays, X-ray imaging, Sensors, Imaging systems, X-ray detectors, Photons, Image transmission, Image analysis, Image processing, Visualization

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Proceedings Article | 1 September 2021 Poster + Paper

3D expression with rendering method for photon counting multi energy x-ray CT

Hiroki Kase, Katsuyuki Takagi, Kento Tabata, Toru Aoki

Proceedings Volume 11838, 118381C (2021) https://doi.org/10.1117/12.2596039

KEYWORDS: Augmented reality, X-rays, X-ray computed tomography, X-ray imaging, Photon counting, 3D modeling, 3D displays, 3D image processing, Mobile devices, Motion models

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Proceedings Article | 1 September 2021 Poster + Paper

Demonstration of polarization behavior of TlBr x-ray imager with silver electrodes

Katsuyuk Takagi, Kohei Toyoda, Hiroki Kase, Toshiyuki Takagi, Kento Tabata, Tsuyoshi Terao, Hisashi Morii, Akifumi Koike, Toru Aoki, Mitsuhiro Nogami, Keitaro Hitomi

Proceedings Volume 11838, 118381E (2021) https://doi.org/10.1117/12.2596374

KEYWORDS: Sensors, Electrodes, Imaging systems, Polarization, Silver, Readout integrated circuits, X-rays, Switching, X-ray imaging, Thallium

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Proceedings Article | 1 August 2021 Poster

High spatial resolution x-ray scintillator with pixel the silicon separator

Toru Aoki, Kento Tabata, Ryota Okate, Shailendra Singh, Hiroki Kase, Katsuyuki Takagi

Proceedings Volume 11838, 118381F (2021) https://doi.org/10.1117/12.2596421

KEYWORDS: Spatial resolution, Silicon, Scintillators, X-rays, Sensors, Image sensors, Image quality, X-ray imaging, X-ray detectors, Semiconducting wafers

Proceedings Article | 28 March 2021 Poster + Presentation

Augmented Reality to improve comprehension to X-ray 3D-CT imaging

Hiroki Kase, Junichi Nishizawa, Katsuyuki Takagi, Toru Aoki

Proceedings Volume 11765, 1176512 (2021) https://doi.org/10.1117/12.2584324

KEYWORDS: X-rays, X-ray imaging, Augmented reality, X-ray computed tomography, X-ray technology, Photon counting, Imaging systems, Visualization, Tablets, Stereoscopy

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Proceedings Article | 5 March 2021 Poster + Presentation + Paper

Photon counting x-ray imager with four-sides buttable structure

Toshiyuki Takagi, Katsuyuki Takagi, Tsuyoshi Terao, Hisashi Morii, Takaharu Okunoyama, Hiroki Kase, Akifumi Koike, Toru Aoki

Proceedings Volume 11693, 1169313 (2021) https://doi.org/10.1117/12.2578283

KEYWORDS: X-ray imaging, Photon counting, Imaging systems, Readout integrated circuits, Sensors, Silicon, Semiconductors, Cadmium

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Proceedings Article | 20 August 2020 Poster

Fabrication of pn junction type CdTe diode x-ray detector by backside laser doping

Junichi Nishizawa, Volodymyr Gnatyuk, Katsuyuki Takagi, Akifumi Koike, Toru Aoki

Proceedings Volume 11494, 114941C (2020) https://doi.org/10.1117/12.2568964

KEYWORDS: Doping, Diodes, X-ray detectors, Semiconductor lasers, Laser applications, Pulsed laser operation, Laser irradiation, Laser development, Diffusion, Neodymium

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Proceedings Article | 20 August 2020 Poster

Multi energy spectral CT imaging method by a general CdTe energy integrating type flat panel detector

Kosuke Kimura, Yukino Imura, Tsuyoshi Terao, Katsuyuki Takagi, Toru Aoki, Ryuji Okunoyama

Proceedings Volume 11494, 114941B (2020) https://doi.org/10.1117/12.2568336

KEYWORDS: X-rays, Sensors, X-ray computed tomography, X-ray detectors, Inspection, Switches, X-ray imaging, Hard x-rays

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Proceedings Article | 20 August 2020 Presentation

Long time operation in TlBr X-ray imager using bipolar-input ROIC

Katsuyuki Takagi, Toru Aoki, Keitaro Hitomi, Tsuyoshi Terao, Hiroki Kase, Akifumi Koike

Proceedings Volume 11494, 114940Y (2020) https://doi.org/10.1117/12.2570543

KEYWORDS: Readout integrated circuits, X-ray imaging, Silver, Electrodes, Imaging systems, Sensors, Thallium, Switching, Photon counting, Amplifiers

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Proceedings Article | 20 August 2020 Poster + Paper

Effect of the concentration of impurities: determining the space charge region thickness on detection properties of Cr/CdTe/Au Schottky diode detectors

Valeriy Sklyarchuk, Volodymyr Gnatyuk, Petro Fochuk, Toru Aoki

Proceedings Volume 11494, 1149419 (2020) https://doi.org/10.1117/12.2568235

KEYWORDS: Crystals, Sensors, Diodes, Cesium, Semiconductors, Gold, Crystallography, Chromium, Resistance

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Proceedings Article | 6 February 2020 Paper

The high resolution scintillator type x-ray imaging detector with Si pixel collimator

Kento Tabata, Ryota Ohtake, Akihumi Koike, Toru Aoki

Proceedings Volume 11369, 113690S (2020) https://doi.org/10.1117/12.2549936

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Proceedings Article | 9 September 2019 Presentation + Paper

Charge counting readout LSI for x-ray imaging and its applications

Katsuyuki Takagi, Toshiyuki Takagi, Tsuyoshi Terao, Hisashi Morii, Akifumi Koike, Toru Aoki

Proceedings Volume 11114, 111140G (2019) https://doi.org/10.1117/12.2529747

KEYWORDS: X-ray imaging, Signal processing, Sensors, X-rays, Digital signal processing, Spectroscopy, X-ray detectors

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Proceedings Article | 9 September 2019 Paper

Effect of the thickness of CdTe crystals on electrical and detection properties of Cr/CdTe/Au Schottky-diode detectors

Valery Sklyarchuk, Volodymyr Gnatyuk, Xiaodong Fang, Toru Aoki

Proceedings Volume 11114, 111141S (2019) https://doi.org/10.1117/12.2529965

KEYWORDS: Crystals, Sensors, Diodes, Semiconductors, Electrodes, Cesium, Resistance, Semiconducting wafers, Radioisotopes, Spectroscopy

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Proceedings Article | 9 September 2019 Presentation

TlBr photon-counting imaging device (Conference Presentation)

Toru Aoki, Katsuyuki Takagi, Akifumi Koike, Keitaro Hitomi

Proceedings Volume 11114, 111140Q (2019) https://doi.org/10.1117/12.2529746

KEYWORDS: Photonic devices, Imaging devices, Electrodes, Sensors, X-rays, Gamma radiation, Photon counting, Semiconducting wafers, Thallium, Silver

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Proceedings Article | 18 September 2018 Paper

Hg3In2Te6-based radiation and temperature stable photodetectors

V. Sklyarchuk, V. Gnatyuk, T. Aoki

Proceedings Volume 10766, 107660R (2018) https://doi.org/10.1117/12.2322518

KEYWORDS: Tellurium, Mercury, Chromium, Crystals, Diodes, Photodetectors, Semiconductors, Photodiodes, Absorption, Mirrors

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Proceedings Article | 13 September 2018 Paper

Pulsed laser deposition of indium on the CdTe crystal surface for contact formation

Kateryna Zelenska, Volodymyr Gnatyuk, Vitaliy Veleschuk, Toru Aoki

Proceedings Volume 10762, 1076218 (2018) https://doi.org/10.1117/12.2323380

KEYWORDS: Laser crystals, Crystals, Laser processing, Semiconductor lasers, Doping, Semiconductors, Glasses, Interfaces, Sensors, Laser ablation

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Proceedings Article | 13 September 2018 Paper

Contrast mediums discrimination by spectral photon-counting CT imaging

K. Kimura, A. Koike, T. Aoki

Proceedings Volume 10762, 1076213 (2018) https://doi.org/10.1117/12.2320978

KEYWORDS: X-rays, X-ray computed tomography, X-ray imaging, Radiography, Photons, Sensors, Iodine, Absorption, Magnetic resonance imaging, Tissues

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Proceedings Article | 14 May 2018 Presentation

Low dose x-ray imaging by photon counting detector (Conference Presentation)

Toru Aoki, Kosuke Kimura, Hisashi Morii, Toshiyuki Takagi, Katsuyuki Takagi, Tsuyoshi Terao, Takaharu Okunoyama, Akifumi Koike

Proceedings Volume 10656, 106560Y (2018) https://doi.org/10.1117/12.2316418

KEYWORDS: Photon counting, X-ray imaging, Sensors, X-ray computed tomography, Imaging systems, Signal attenuation, Hard x-rays, Medical imaging, Signal processing, X-ray sources

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Proceedings Article | 14 May 2018 Paper

Readout QDC for CdTe x-ray imager using direct charge treatment

Katsuyuki Takagi, Toshiyuki Takagi, Tsuyoshi Terao, Akifumi Koike, Toru Aoki

Proceedings Volume 10656, 106561W (2018) https://doi.org/10.1117/12.2316419

KEYWORDS: Photon counting, Sensors, X-ray imaging, X-rays, X-ray detectors, Semiconductors, Time correlated photon counting, Quantization, Imaging systems, Spectroscopy

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Proceedings Article | 18 January 2018 Paper

Prospects of In/CdTe X- and γ-ray detectors with MoO Ohmic contacts

Olena Maslyanchuk, Mykhailo Solovan, Eduard Maistruk, Viktor Brus, Pavlo Maryanchuk, Volodymyr Gnatyuk, Toru Aoki

Proceedings Volume 10612, 106120V (2018) https://doi.org/10.1117/12.2305085

KEYWORDS: Sensors, Diodes, Molybdenum, Heterojunctions, Spectroscopy, Cesium, Americium, Crystals, Electrons, Resistance

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Proceedings Article | 16 June 2017 Presentation

Nano scale doping in CdTe for radiation detector (Conference Presentation)

Toru Aoki, Kateryna Zelenska, Volodymyr Gnatyuk, Akifumi Koike

Proceedings Volume 10248, 102480T (2017) https://doi.org/10.1117/12.2267528

KEYWORDS: Diodes, Laser processing, Semiconductor physics, Doping, Sensors, Crystals, Laser crystals, Semiconductor lasers, Semiconductors, Laser irradiation

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Proceedings Article | 2 June 2017 Paper

Direct charge handling method for dead-time-less photon counting

Katsuyuki Takagi, Akifumi Koike, Toru Aoki

Proceedings Volume 10209, 102091D (2017) https://doi.org/10.1117/12.2272805

KEYWORDS: X-ray imaging, Quantization, Time correlated photon counting, Photography, Imaging systems, Sensors, X-rays, Photon counting, Semiconductors, X-ray detectors

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Proceedings Article | 22 February 2017 Presentation + Paper

On the possibility of visualization of undersurface submicron-sized inhomogeneities via laser-induced incandescence of surface layers

Maksym Kokhan, Ilona Koleshnia, Serge Zelensky, Toru Aoki

Proceedings Volume 10097, 100970G (2017) https://doi.org/10.1117/12.2253006

KEYWORDS: Computer simulations, Visualization, Pulsed laser operation, Visible radiation, Laser processing, Laser irradiation, Absorption, Carbon, Signal detection

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Proceedings Article | 2 November 2016 Presentation

CdTe imaging device driven by current integration mode (Conference Presentation)

Toru Aoki, Akifumi Koike, Takaharu Okunoyama, Hisashi Morii, Katsuyuki Takagi, Junichi Nishizawa

Proceedings Volume 9968, 996809 (2016) https://doi.org/10.1117/12.2240381

KEYWORDS: Imaging devices, Sensors, Algorithm development, Data corrections, Detection and tracking algorithms, Field programmable gate arrays, Hard x-rays, Gamma radiation, Physics, Current controlled current source

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Proceedings Article | 30 September 2016 Paper

CsI:Tl scintillator separated by Si grid partition wall

Kento Tabata, Junichi Nishizawa, Akihumi Koike, Toru Aoki

Proceedings Volume 9968, 99681H (2016) https://doi.org/10.1117/12.2238424

KEYWORDS: Scintillators, Silicon, X-rays, Luminescence, Wafer-level optics, Image sensors, Sensors, Diffusion, Photodiodes, Microelectromechanical systems

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Proceedings Article | 26 September 2013 Paper

Reasons of low-charge collection efficiency in CdTe-based x/gamma detectors with ohmic contacts

Toru Aoki, O. Maslyanchuk, L. Kosyachenko, V. Gnatyuk

Proceedings Volume 8852, 88521C (2013) https://doi.org/10.1117/12.2022657

KEYWORDS: Crystals, Sensors, Electrons, Quantum efficiency, Absorption, Energy efficiency, Metals, Semiconductors, Dielectrics, Diffusion

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Proceedings Article | 24 October 2012 Paper

Photoluminescence and absorption properties of the surface functional layer of CdTe crystals

Dmytro Gnatyuk, Leonid Poperenko, Iryna Yurgelevych, Oleksandr Dacenko, Toru Aoki, Manato Kimura

Proceedings Volume 8507, 85071U (2012) https://doi.org/10.1117/12.940764

KEYWORDS: Crystals, Surface finishing, Luminescence, Laser crystals, Absorption, Wet etching, Laser irradiation, Tellurium, Etching, Laser energy

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Proceedings Article | 24 October 2012 Paper

Surface processing of CdZnTe crystals

V. Gnatyuk, O. Vlasenko, S. Levytskyi, E. Dieguez, J. Crocco, H. Bensalah, M. Fiederle, A. Fauler, T. Aoki

Proceedings Volume 8507, 85071S (2012) https://doi.org/10.1117/12.937953

KEYWORDS: Crystals, Laser crystals, Surface finishing, Etching, Semiconductors, Wet etching, Transmittance, Laser irradiation, Polishing, Laser energy

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Proceedings Article | 28 September 2011 Paper

Characterization of the surfaces of CdTe(111) single crystals after laser processing

Dmytro Gnatyuk, Leonid Poperenko, Iryna Yurgelevych, Toru Aoki

Proceedings Volume 8142, 81421N (2011) https://doi.org/10.1117/12.898417

KEYWORDS: Crystals, Laser crystals, Surface finishing, Wet etching, Laser irradiation, Laser processing, Refractive index, Atomic force microscopy, Laser energy, Etching

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Proceedings Article | 28 September 2011 Paper

High resolution CdTe x- and gamma-ray detectors with a laser-formed p-n junction

V. Gnatyuk, T. Aoki, E. Grushko, L. Kosyachenko, O. Vlasenko

Proceedings Volume 8142, 81420B (2011) https://doi.org/10.1117/12.895555

KEYWORDS: Sensors, Crystals, Diodes, Doping, Laser crystals, Electrodes, Semiconductor lasers, Laser irradiation, Surface finishing, Chemical species

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Proceedings Article | 28 September 2011 Paper

Carrier transportation properties in M-p-n and Schottky CdTe diode detector

Manato Kimura, Akifumi Koike, Takaharu Okunoayama, Hisashi Morii, Shailendra Singh, Toshitaka Yamakawa, Hidenori Mimura, Toru Aoki

Proceedings Volume 8142, 81421D (2011) https://doi.org/10.1117/12.896969

KEYWORDS: Sensors, Diodes, Polarization, Signal processing, Europium, Imaging systems, Signal detection, Absorption, Time metrology, Photon counting

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Proceedings Article | 23 September 2011 Paper

Evaluation of characteristics of CdTe detector by laser pulses

Yuto Suzuki, Tetsu Ito, Akifumi Koike, Hisashi Morii, Aki Miyake, Yoichiro Neo, Hidenori Mimura, Toru Aoki

Proceedings Volume 8142, 814209 (2011) https://doi.org/10.1117/12.896585

KEYWORDS: Sensors, Pulsed laser operation, Signal detection, Absorption, Solids, Laser energy, Polarization, Semiconductor lasers, Oscilloscopes, Time metrology

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Proceedings Article | 27 August 2010 Paper

Charge transport mechanism in CdTe-based p-n junction detectors formed by laser irradiation

T. Aoki, V. Gnatyuk, L. Kosyachenko, O. Maslyanchuk, E. Grushko

Proceedings Volume 7805, 780517 (2010) https://doi.org/10.1117/12.862692

KEYWORDS: Sensors, Diodes, Electrons, Crystals, Doping, Laser irradiation, Laser crystals, Diffusion, Electrodes, Gold

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Proceedings Article | 27 August 2010 Paper

Special features of conductivity of semi-intrinsic CdTe and CdZnTe single crystals used in x- and gamma-ray detectors

L. Kosyachenko, E. Diequez, T. Aoki, C. Lambropoulos, V. Gnatyuk, M. Fiederle, S. Melnychuk, O. Maslyanchuk, O. Sklyarchuk, E. Grushko

Proceedings Volume 7805, 78051I (2010) https://doi.org/10.1117/12.862726

KEYWORDS: Semiconductors, Crystals, Sensors, Ionization, Temperature metrology, P-type semiconductors, Neodymium, N-type semiconductors, Gamma radiation, Absorption

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Proceedings Article | 27 August 2010 Paper

Neutron detection with Gd/CdTe semiconductor detector

Aki Miyake, Takahiro Nishioka, Shailendra Singh, Hisashi Morii, Yoichiro Neo, Hidenori Mimura, Toru Aoki

Proceedings Volume 7805, 78051L (2010) https://doi.org/10.1117/12.862505

KEYWORDS: Sensors, Gadolinium, Gamma radiation, Semiconductors, Radiography, Monte Carlo methods, Image resolution, Cadmium, Energy efficiency, Computer simulations

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Proceedings Article | 27 August 2010 Paper

Improvement of analysis precision upon the atomic number and electron density measurement by the dual x-ray CT

Yukino Imura, Hisashi Morii, Akifumi Koike, Takaharu Okunoyama, Yoichiro Neo, Hidenori Mimura, Toru Aoki

Proceedings Volume 7805, 78051M (2010) https://doi.org/10.1117/12.862639

KEYWORDS: Signal attenuation, Sensors, X-rays, X-ray computed tomography, X-ray detectors, Aluminum, Gamma radiation, X-ray imaging, Scattering, Absorption

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Proceedings Article | 28 September 2009 Paper

High-speed photon counting processing for CdTe detector

B. Shinomiya, A. Koike, H. Morii, T. Okunoyama, Y. Neo, H. Mimura, T. Aoki

Proceedings Volume 7449, 74490J (2009) https://doi.org/10.1117/12.826007

KEYWORDS: X-rays, Signal processing, Sensors, Photon counting, X-ray detectors, Aluminum, X-ray imaging, Oscilloscopes, Signal attenuation, Semiconductors

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Proceedings Article | 4 September 2008 Paper

CdTe x-ray image sensor driven by field emitter array

Toru Aoki, Takuya Sakata, Yuichiro Hanawa, Masashi Nakagawa, Hisashi Morii, Akifumi Koike, Yoichiro Neo, Hidenori Mimura

Proceedings Volume 7079, 707912 (2008) https://doi.org/10.1117/12.795654

KEYWORDS: X-rays, Finite element methods, Image sensors, X-ray imaging, Electrodes, Diodes, Copper, Electron beams, Reactive ion etching, Spatial resolution

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Proceedings Article | 4 September 2008 Paper

Photon counting x-ray CT with 3D holograms by CdTe line sensor

A. Koike, M. Yomori, H. Morii, Y. Neo, T. Aoki, H. Mimura

Proceedings Volume 7079, 70790F (2008) https://doi.org/10.1117/12.796908

KEYWORDS: X-rays, X-ray computed tomography, Holograms, 3D displays, Holography, 3D image reconstruction, X-ray imaging, 3D image processing, Displays, Sensors

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Proceedings Article | 4 September 2008 Paper

Application of the dual energy technique by using a photon counting CdTe detector

Wenjuan Zou, Takuya Nakashima, Yoshiaki Onishi, Hisashi Morii, Yoichiro Neo, Hidenori Mimura, Toru Aoki

Proceedings Volume 7079, 70790I (2008) https://doi.org/10.1117/12.794634

KEYWORDS: Signal attenuation, Sensors, X-rays, X-ray computed tomography, Nickel, Photon counting, Scattering, Calibration, Dual energy imaging, X-ray detectors

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Proceedings Article | 4 September 2008 Paper

Features of characteristics and stability of CdTe nuclear radiation detectors fabricated by laser doping technique

Volodymyr Gnatyuk, Toru Aoki, Oleksandr Vlasenko, Sergiy Levytskyi, Yoshinori Hatanaka, Charalambos Lambropoulos

Proceedings Volume 7079, 70790G (2008) https://doi.org/10.1117/12.799233

KEYWORDS: Sensors, Crystals, Diodes, Doping, Laser crystals, Semiconductor lasers, X-ray detectors, X-rays, Electrodes, Semiconductors

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Proceedings Article | 22 April 2008 Paper

Full-color image reconstruction by holography for 3D x-ray CT

Akifumi Koike, Hisashi Morii, Mitsuhiro Yomori, Yoichiro Neo, Toru Aoki, Hidenori Mimura

Proceedings Volume 7008, 70081H (2008) https://doi.org/10.1117/12.797349

KEYWORDS: Holograms, X-rays, 3D image reconstruction, LCDs, Holography, 3D image processing, 3D displays, X-ray detectors, X-ray computed tomography, X-ray imaging

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Proceedings Article | 22 April 2008 Paper

X-ray, gamma-ray detector/imager by CdTe semiconductor and its applications

Toru Aoki, Hisashi Morii, Takuya Nakashima, Yasuyuki Takahashi, Gosuke Ohashi, Yasuhiro Tomita, Yoichiro Neo, Hidenori Mimura

Proceedings Volume 7008, 70080R (2008) https://doi.org/10.1117/12.796991

KEYWORDS: X-rays, X-ray imaging, X-ray computed tomography, Signal attenuation, Sensors, X-ray detectors, Photon counting, Imaging systems, Gamma radiation, Collimators

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Proceedings Article | 22 April 2008 Paper

CdTe-based Schottky diode x-ray detectors for medical imaging

V. Gnatyuk, O. Vlasenko, L. Kosyachenko, O. Maslyanchuk, V. Sklyarchuk, E. Grushko, T. Aoki

Proceedings Volume 7008, 70081Z (2008) https://doi.org/10.1117/12.797360

KEYWORDS: Diodes, X-rays, Sensors, X-ray detectors, Electrons, Semiconductors, Absorption, Diffusion, Neodymium, X-ray imaging

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Proceedings Article | 22 April 2008 Paper

Novel light sources using micro field emitters

H. Mimura, Y. Neo, T. Aoki

Proceedings Volume 7008, 70080V (2008) https://doi.org/10.1117/12.797002

KEYWORDS: X-rays, Light sources, Ultraviolet radiation, X-ray imaging, Silicon, Xenon, Electron beams, Light, Excimers, Near infrared

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Proceedings Article | 21 September 2007 Paper

Application of CdTe photon-counting x-ray imager to material discriminated x-ray CT

Takuya Nakashima, Hisashi Morii, Yoichiro Neo, Hidenori Mimura, Toru Aoki

Proceedings Volume 6706, 67060C (2007) https://doi.org/10.1117/12.733987

KEYWORDS: X-rays, Signal attenuation, Sensors, Iron, Titanium, Aluminum, Collimators, X-ray imaging, Time metrology, X-ray computed tomography

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Proceedings Article | 30 August 2006 Paper

Field emitter type CdTe radiation detector for x-ray imager

Takuya Sakata, Yoshiaki Ikeda, Kazufumi Shiozawa, Yoichiro Neo, Hisashi Morii, Toru Aoki, Hidenori Mimura

Proceedings Volume 6319, 63190O (2006) https://doi.org/10.1117/12.680434

KEYWORDS: X-rays, Sensors, Carbon, Diodes, Electronics, X-ray imaging, Image sensors, Electrodes, Excimer lasers, X-ray detectors

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Proceedings Article | 30 August 2006 Paper

Two-dimensional CdTe photon counting imager for hard x-ray

Toru Aoki, Hisashi Morii, Gosuke Ohashi, Yasuhiro Tomita, Yoshinori Hatanaka

Proceedings Volume 6319, 63190K (2006) https://doi.org/10.1117/12.683423

KEYWORDS: Imaging systems, Sensors, X-ray imaging, X-rays, Prototyping, Photon counting, Hard x-rays, Diodes, Radioisotopes, Imaging devices

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Proceedings Article | 21 September 2005 Paper

Formation of electrical contacts on CdTe crystals for x-ray detectors performance

Volodymyr Gnatyuk, Toru Aoki, Yoshinori Hatanaka, Olexandr Vlasenko

Proceedings Volume 5922, 59220I (2005) https://doi.org/10.1117/12.622637

KEYWORDS: Diodes, Crystals, Doping, Laser crystals, Semiconductor lasers, Semiconducting wafers, Sensors, Laser irradiation, Excimer lasers, Electrodes

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Proceedings Article | 17 September 2005 Paper

X-ray color scanner with multiple energy discrimination capability

Y. Tomita, Y. Shirayanagi, S. Matsui, T. Aoki, Y. Hatanaka

Proceedings Volume 5922, 59220A (2005) https://doi.org/10.1117/12.620025

KEYWORDS: X-rays, Scanners, X-ray imaging, Sensors, X-ray detectors, Gamma radiation, Signal processing, Photon counting, Nondestructive evaluation, X-ray sources

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Proceedings Article | 17 September 2005 Paper

Super-resolution x-ray imaging by CdTe discrete detector arrays

T. Aoki, Y. Ishida, H. Morii, Y. Tomita, G. Ohashi, J. Temmyo, Y. Hatanaka

Proceedings Volume 5922, 59220T (2005) https://doi.org/10.1117/12.616887

KEYWORDS: Sensors, X-ray imaging, Super resolution, X-rays, Imaging devices, Detector arrays, Scanners, Diodes, Doping, Excimer lasers

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Proceedings Article | 17 September 2005 Paper

Energy distinction type CdTe two-dimension x-ray imaging device

Daiji Furuhashi, Daisuke Sakashita, Yu Ishida, Toru Aoki, Yasuhiro Tomita, Yoshinori Hatanaka, Jiro Temmyo

Proceedings Volume 5922, 59220Z (2005) https://doi.org/10.1117/12.620064

KEYWORDS: Sensors, Doping, Excimer lasers, X-ray imaging, Imaging devices, Fabrication, Image sensors, Radioisotopes, Photomasks, Semiconducting wafers

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Proceedings Article | 17 September 2005 Paper

Evaluation of properties of various type CdTe hard x-ray detectors

Asuka Togami, Yu Ishida, Toru Aoki, Yoshinori Hatanaka, Jiro Temmyo

Proceedings Volume 5922, 592210 (2005) https://doi.org/10.1117/12.620071

KEYWORDS: Sensors, Polarization, Temperature metrology, Capacitance, Crystals, Hard x-rays, Indium, Electrodes, Electronics, Image sensors

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Proceedings Article | 21 October 2004 Paper

Development of energy-discriminate CdTe imaging detector for hard x-ray

Toru Aoki, Yu Ishida, Daisuke Sakashita, Volodymyr Gnatyuk, Atsushi Nakamura, Yasuhiro Tomita, Yoshinori Hatanaka, Jiro Temmyo

Proceedings Volume 5540, (2004) https://doi.org/10.1117/12.559479

KEYWORDS: Sensors, Imaging systems, X-ray imaging, X-rays, Image sensors, Hard x-rays, Control systems, X-ray detectors, Excimer lasers, X-ray sources

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Proceedings Article | 10 January 2003 Paper

p-i-n CdTe 128-pixel detector for gamma-ray imaging fabricated by excimer laser processing

Toru Aoki, Atsushi Nakamura, Madan Niraula, Yasuhiro Tomita, Yoshinori Hatanaka

Proceedings Volume 4784, (2003) https://doi.org/10.1117/12.455777

KEYWORDS: Sensors, Excimer lasers, Diodes, Doping, Image sensors, Electrodes, Gamma ray imaging, Image resolution, Ceramics, Semiconducting wafers

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Proceedings Article | 10 January 2003 Paper

Excimer laser processing for integrated gamma-ray detectors

Atsushi Nakamura, Madan Niraula, Koji Asano, Toru Aoki, Yoshinori Hatanaka

Proceedings Volume 4784, (2003) https://doi.org/10.1117/12.455779

KEYWORDS: Sensors, Excimer lasers, Indium, Crystals, Gamma radiation, Doping, Laser processing, Diffusion, Electrodes, Diodes

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Proceedings Article | 21 November 2000 Paper

Low-temperature processing for the fabrication of heavily doped CdTe gamma-ray detectors by epitaxial growth and laser annealing

Yoshinori Hatanaka, Madan Niraula, A. Nakamura, Toru Aoki, Dajii Noda, Yasuhiro Tomita

Proceedings Volume 4141, (2000) https://doi.org/10.1117/12.407585

KEYWORDS: Sensors, Excimer lasers, Doping, Crystals, Hydrogen, Iodine, Antimony, Tellurium, Electrodes, Laser crystals

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Proceedings Article | 19 October 1999 Paper

Fabrication of CdTe detectors in a new p-i-n design for gamma-ray spectroscopy

Madan Niraula, Daisuke Mochizuki, Toru Aoki, Yasuhiro Tomita, Tokuaki Nihashi, Yoshinori Hatanaka

Proceedings Volume 3768, (1999) https://doi.org/10.1117/12.366585

KEYWORDS: Sensors, Crystals, Electrodes, Indium, Gold, Sensor performance, Gamma radiation, Radioisotopes, Spectroscopy, Iodine

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Proceedings Article | 7 July 1998 Paper

Heavy p-type doping of ZnSe-based II-VI semiconductors using an excimer laser

Yoshinori Hatanaka, Toru Aoki, Madan Niraula, Y. Aoki, Yoichiro Nakanishi

Proceedings Volume 3283, (1998) https://doi.org/10.1117/12.316725

KEYWORDS: Doping, Excimer lasers, Annealing, Nitrogen, Diodes, Metals, Chemical species, Semiconductor lasers, Sodium, Electrodes

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Showing 5 of 75 publications

Conference Committee Involvement (20)

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXVII

3 August 2025 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXVI

19 August 2024 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXV

21 August 2023 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIV

22 August 2022 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII

1 August 2021 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXII

25 August 2020 | Online Only, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI

12 August 2019 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XX

20 August 2018 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX

7 August 2017 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII

29 August 2016 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII

10 August 2015 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVI

18 August 2014 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XV

26 August 2013 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIV

13 August 2012 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII

22 August 2011 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XII

2 August 2010 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI

3 August 2009 | San Diego, California, United States

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics X

11 August 2008 | San Diego, California, United States

Hard X-Ray and Gamma-Ray Detector Physics IX

27 August 2007 | San Diego, California, United States

Hard X-Ray and Gamma-Ray Detector Physics VIII

14 August 2006 | San Diego, California, United States

Showing 5 of 20 Conference Committees

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