The Experts below are selected from a list of 26655 Experts worldwide ranked by ideXlab platform

Eiichi Sato - One of the best experts on this subject based on the ideXlab platform.

  • k edge angiography utilizing a tungsten plasma x ray generator in conjunction with gadolinium based contrast media
    Radiation Physics and Chemistry, 2006
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama, Yasuomi Hayasi, Jun Onagawa
    Abstract:

    Abstract The tungsten plasma flash X-ray generator is useful in order to perform high-speed enhanced K-edge angiography using cone beams because K-series characteristic X-rays from the tungsten target are absorbed effectively by gadolinium-based contrast media. In the flash X-ray generator, a 150 nF condenser is charged up to 80 kV by a power supply, and flash X-rays are produced by the disCharging. The X-ray tube is a demountable diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Since the electric circuit of the high-Voltage pulse generator employs a cable transmission line, the high-Voltage pulse generator produces twice the potential of the condenser Charging Voltage. At a Charging Voltage of 80 kV, the estimated maximum tube Voltage and current were approximately 160 kV and 40 kA, respectively. When the Charging Voltage was increased, the characteristic X-ray intensities of tungsten K α lines increased. The K α lines were clean, and hardly any bremsstrahlung rays were detected. The X-ray pulse widths were approximately 110 ns, and the time-integrated X-ray intensity had a value of approximately 0.35 mGy at 1.0 m from the X-ray source with a Charging Voltage of 80 kV. Angiography was performed using a film-less computed radiography (CR) system and gadolinium-based contrast media. In angiography of non-living animals, we observed fine blood vessels of approximately 100 μm with high contrasts.

  • enhanced k edge angiography utilizing tantalum plasma x ray generator in conjunction with gadolinium based contrast media
    Japanese Journal of Applied Physics, 2005
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Yasuomi Hayasi, Koji Kimura, Kazuyoshi Takayama
    Abstract:

    The tantalum plasma flash X-ray generator is useful for performing high-speed enhanced K-edge angiography using cone beams because K-series characteristic X-rays from the tantalum target are absorbed effectively by gadolinium-based contrast media. In the flash X-ray generator, a 150 nF condenser is charged up to 80 kV by a power supply, and flash X-rays are produced by the disCharging. The X-ray tube is a demountable cold-cathode diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Since the electric circuit of the high-Voltage pulse generator employs a cable transmission line, the high-Voltage pulse generator produces twice the potential of the condenser Charging Voltage. At a Charging Voltage of 80 kV, the estimated maximum tube Voltage and current were approximately 160 kV and 40 kA, respectively. When the Charging Voltage was increased, the K-series characteristic X-ray intensities of cerium increased. The K lines were clean and intense, and hardly any bremsstrahlung rays were detected. The X-ray pulse widths were approximately 100 ns, and the time-integrated X-ray intensity had a value of approximately 300 µGy at 1.0 m from the X-ray source with a Charging Voltage of 80 kV. Angiography was performed using a filmless computed radiography (CR) system and gadolinium-based contrast media. In the angiography of nonliving animals, we observed fine blood vessels of approximately 100 µm with high contrasts.

  • quasi monochromatic flash x ray generator utilizing disk cathode molybdenum tube
    Japanese Journal of Applied Physics, 2004
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Shigehiro Sato, Toshio Ichimaru, Michiaki Sagae, Yasuomi Hayasi, Rudolf Germer, Kazuyoshi Takayama
    Abstract:

    High-Voltage condensers in a polarity-inversion two-stage Marx surge generator are charged from -40 to -60 kV using a power supply, and the electric charges in the condensers are discharged to an X-ray tube after closing the gap switches in the surge generator using a trigger device. The X-ray tube is a demountable diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Sharp K-series characteristic X-rays of molybdenum are produced without using a monochromatic filter, since the tube utilizes a disk cathode and a rod target, and bremsstrahlung rays are not emitted in the opposite direction to that of electron acceleration. The peak tube Voltage increased with increasing Charging Voltage and increasing space between the target and cathode electrodes. At a Charging Voltage of -60 kV and a target-cathode space of 1.0 mm, the peak tube Voltage and current were 110 kV and 0.75 kA, respectively. The pulse width ranged from 40 to 100 ns, and the maximum dimension of the X-ray source was 3.0 mm in diameter. The number of generator-produced K photons was approximately 7×1014 photons/cm2s at 0.5 m from the source.

  • quasi monochromatic flash x ray generator utilizing weakly ionized linear copper plasma
    Review of Scientific Instruments, 2003
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Toshio Ichimaru, Kazuyoshi Takayama, Yasuomi Hayasi, Rudolf Germer, Hideaki Ido
    Abstract:

    In the plasma flash x-ray generator, a 200 nF condenser is charged up to 50 kV by a power supply, and flash x rays are produced by the disCharging. The x-ray tube is a demountable triode with a trigger electrode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Target evaporation leads to the formation of weakly ionized linear plasma, consisting of copper ions and electrons, around the fine target, and intense characteristic x rays are produced. At a Charging Voltage of 50 kV, the maximum tube Voltage was almost equal to the Charging Voltage of the main condenser, and the peak current was about 20 kA. When the Charging Voltage was increased, the linear plasma formed, and the K-series characteristic x-ray intensities increased. The K lines were quite sharp and intense, and hardly any bremsstrahlung rays were detected at all. The x-ray pulse widths were approximately 700 ns, and the time-integrated x-ray intensity had a value of approximately 30 μC/kg at 1.0 m ...

  • quasi monochromatic flash x ray generator utilizing weakly ionized linear copper plasma
    Review of Scientific Instruments, 2003
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Toshio Ichimaru, Kazuyoshi Takayama, Yasuomi Hayasi, Rudolf Germer, Hideaki Ido
    Abstract:

    In the plasma flash x-ray generator, a 200 nF condenser is charged up to 50 kV by a power supply, and flash x rays are produced by the disCharging. The x-ray tube is a demountable triode with a trigger electrode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Target evaporation leads to the formation of weakly ionized linear plasma, consisting of copper ions and electrons, around the fine target, and intense characteristic x rays are produced. At a Charging Voltage of 50 kV, the maximum tube Voltage was almost equal to the Charging Voltage of the main condenser, and the peak current was about 20 kA. When the Charging Voltage was increased, the linear plasma formed, and the K-series characteristic x-ray intensities increased. The K lines were quite sharp and intense, and hardly any bremsstrahlung rays were detected at all. The x-ray pulse widths were approximately 700 ns, and the time-integrated x-ray intensity had a value of approximately 30 μC/kg at 1.0 m from the x-ray source with a Charging Voltage of 50 kV.

Kazuyoshi Takayama - One of the best experts on this subject based on the ideXlab platform.

  • k edge angiography utilizing a tungsten plasma x ray generator in conjunction with gadolinium based contrast media
    Radiation Physics and Chemistry, 2006
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama, Yasuomi Hayasi, Jun Onagawa
    Abstract:

    Abstract The tungsten plasma flash X-ray generator is useful in order to perform high-speed enhanced K-edge angiography using cone beams because K-series characteristic X-rays from the tungsten target are absorbed effectively by gadolinium-based contrast media. In the flash X-ray generator, a 150 nF condenser is charged up to 80 kV by a power supply, and flash X-rays are produced by the disCharging. The X-ray tube is a demountable diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Since the electric circuit of the high-Voltage pulse generator employs a cable transmission line, the high-Voltage pulse generator produces twice the potential of the condenser Charging Voltage. At a Charging Voltage of 80 kV, the estimated maximum tube Voltage and current were approximately 160 kV and 40 kA, respectively. When the Charging Voltage was increased, the characteristic X-ray intensities of tungsten K α lines increased. The K α lines were clean, and hardly any bremsstrahlung rays were detected. The X-ray pulse widths were approximately 110 ns, and the time-integrated X-ray intensity had a value of approximately 0.35 mGy at 1.0 m from the X-ray source with a Charging Voltage of 80 kV. Angiography was performed using a film-less computed radiography (CR) system and gadolinium-based contrast media. In angiography of non-living animals, we observed fine blood vessels of approximately 100 μm with high contrasts.

  • enhanced k edge angiography utilizing tantalum plasma x ray generator in conjunction with gadolinium based contrast media
    Japanese Journal of Applied Physics, 2005
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Yasuomi Hayasi, Koji Kimura, Kazuyoshi Takayama
    Abstract:

    The tantalum plasma flash X-ray generator is useful for performing high-speed enhanced K-edge angiography using cone beams because K-series characteristic X-rays from the tantalum target are absorbed effectively by gadolinium-based contrast media. In the flash X-ray generator, a 150 nF condenser is charged up to 80 kV by a power supply, and flash X-rays are produced by the disCharging. The X-ray tube is a demountable cold-cathode diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Since the electric circuit of the high-Voltage pulse generator employs a cable transmission line, the high-Voltage pulse generator produces twice the potential of the condenser Charging Voltage. At a Charging Voltage of 80 kV, the estimated maximum tube Voltage and current were approximately 160 kV and 40 kA, respectively. When the Charging Voltage was increased, the K-series characteristic X-ray intensities of cerium increased. The K lines were clean and intense, and hardly any bremsstrahlung rays were detected. The X-ray pulse widths were approximately 100 ns, and the time-integrated X-ray intensity had a value of approximately 300 µGy at 1.0 m from the X-ray source with a Charging Voltage of 80 kV. Angiography was performed using a filmless computed radiography (CR) system and gadolinium-based contrast media. In the angiography of nonliving animals, we observed fine blood vessels of approximately 100 µm with high contrasts.

  • quasi monochromatic flash x ray generator utilizing disk cathode molybdenum tube
    Japanese Journal of Applied Physics, 2004
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Shigehiro Sato, Toshio Ichimaru, Michiaki Sagae, Yasuomi Hayasi, Rudolf Germer, Kazuyoshi Takayama
    Abstract:

    High-Voltage condensers in a polarity-inversion two-stage Marx surge generator are charged from -40 to -60 kV using a power supply, and the electric charges in the condensers are discharged to an X-ray tube after closing the gap switches in the surge generator using a trigger device. The X-ray tube is a demountable diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Sharp K-series characteristic X-rays of molybdenum are produced without using a monochromatic filter, since the tube utilizes a disk cathode and a rod target, and bremsstrahlung rays are not emitted in the opposite direction to that of electron acceleration. The peak tube Voltage increased with increasing Charging Voltage and increasing space between the target and cathode electrodes. At a Charging Voltage of -60 kV and a target-cathode space of 1.0 mm, the peak tube Voltage and current were 110 kV and 0.75 kA, respectively. The pulse width ranged from 40 to 100 ns, and the maximum dimension of the X-ray source was 3.0 mm in diameter. The number of generator-produced K photons was approximately 7×1014 photons/cm2s at 0.5 m from the source.

  • quasi monochromatic flash x ray generator utilizing weakly ionized linear copper plasma
    Review of Scientific Instruments, 2003
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Toshio Ichimaru, Kazuyoshi Takayama, Yasuomi Hayasi, Rudolf Germer, Hideaki Ido
    Abstract:

    In the plasma flash x-ray generator, a 200 nF condenser is charged up to 50 kV by a power supply, and flash x rays are produced by the disCharging. The x-ray tube is a demountable triode with a trigger electrode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Target evaporation leads to the formation of weakly ionized linear plasma, consisting of copper ions and electrons, around the fine target, and intense characteristic x rays are produced. At a Charging Voltage of 50 kV, the maximum tube Voltage was almost equal to the Charging Voltage of the main condenser, and the peak current was about 20 kA. When the Charging Voltage was increased, the linear plasma formed, and the K-series characteristic x-ray intensities increased. The K lines were quite sharp and intense, and hardly any bremsstrahlung rays were detected at all. The x-ray pulse widths were approximately 700 ns, and the time-integrated x-ray intensity had a value of approximately 30 μC/kg at 1.0 m ...

  • quasi monochromatic flash x ray generator utilizing weakly ionized linear copper plasma
    Review of Scientific Instruments, 2003
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Toshio Ichimaru, Kazuyoshi Takayama, Yasuomi Hayasi, Rudolf Germer, Hideaki Ido
    Abstract:

    In the plasma flash x-ray generator, a 200 nF condenser is charged up to 50 kV by a power supply, and flash x rays are produced by the disCharging. The x-ray tube is a demountable triode with a trigger electrode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Target evaporation leads to the formation of weakly ionized linear plasma, consisting of copper ions and electrons, around the fine target, and intense characteristic x rays are produced. At a Charging Voltage of 50 kV, the maximum tube Voltage was almost equal to the Charging Voltage of the main condenser, and the peak current was about 20 kA. When the Charging Voltage was increased, the linear plasma formed, and the K-series characteristic x-ray intensities increased. The K lines were quite sharp and intense, and hardly any bremsstrahlung rays were detected at all. The x-ray pulse widths were approximately 700 ns, and the time-integrated x-ray intensity had a value of approximately 30 μC/kg at 1.0 m from the x-ray source with a Charging Voltage of 50 kV.

Etsuro Tanaka - One of the best experts on this subject based on the ideXlab platform.

  • k edge angiography utilizing a tungsten plasma x ray generator in conjunction with gadolinium based contrast media
    Radiation Physics and Chemistry, 2006
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama, Yasuomi Hayasi, Jun Onagawa
    Abstract:

    Abstract The tungsten plasma flash X-ray generator is useful in order to perform high-speed enhanced K-edge angiography using cone beams because K-series characteristic X-rays from the tungsten target are absorbed effectively by gadolinium-based contrast media. In the flash X-ray generator, a 150 nF condenser is charged up to 80 kV by a power supply, and flash X-rays are produced by the disCharging. The X-ray tube is a demountable diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Since the electric circuit of the high-Voltage pulse generator employs a cable transmission line, the high-Voltage pulse generator produces twice the potential of the condenser Charging Voltage. At a Charging Voltage of 80 kV, the estimated maximum tube Voltage and current were approximately 160 kV and 40 kA, respectively. When the Charging Voltage was increased, the characteristic X-ray intensities of tungsten K α lines increased. The K α lines were clean, and hardly any bremsstrahlung rays were detected. The X-ray pulse widths were approximately 110 ns, and the time-integrated X-ray intensity had a value of approximately 0.35 mGy at 1.0 m from the X-ray source with a Charging Voltage of 80 kV. Angiography was performed using a film-less computed radiography (CR) system and gadolinium-based contrast media. In angiography of non-living animals, we observed fine blood vessels of approximately 100 μm with high contrasts.

  • enhanced k edge angiography utilizing tantalum plasma x ray generator in conjunction with gadolinium based contrast media
    Japanese Journal of Applied Physics, 2005
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Yasuomi Hayasi, Koji Kimura, Kazuyoshi Takayama
    Abstract:

    The tantalum plasma flash X-ray generator is useful for performing high-speed enhanced K-edge angiography using cone beams because K-series characteristic X-rays from the tantalum target are absorbed effectively by gadolinium-based contrast media. In the flash X-ray generator, a 150 nF condenser is charged up to 80 kV by a power supply, and flash X-rays are produced by the disCharging. The X-ray tube is a demountable cold-cathode diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Since the electric circuit of the high-Voltage pulse generator employs a cable transmission line, the high-Voltage pulse generator produces twice the potential of the condenser Charging Voltage. At a Charging Voltage of 80 kV, the estimated maximum tube Voltage and current were approximately 160 kV and 40 kA, respectively. When the Charging Voltage was increased, the K-series characteristic X-ray intensities of cerium increased. The K lines were clean and intense, and hardly any bremsstrahlung rays were detected. The X-ray pulse widths were approximately 100 ns, and the time-integrated X-ray intensity had a value of approximately 300 µGy at 1.0 m from the X-ray source with a Charging Voltage of 80 kV. Angiography was performed using a filmless computed radiography (CR) system and gadolinium-based contrast media. In the angiography of nonliving animals, we observed fine blood vessels of approximately 100 µm with high contrasts.

  • quasi monochromatic flash x ray generator utilizing disk cathode molybdenum tube
    Japanese Journal of Applied Physics, 2004
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Shigehiro Sato, Toshio Ichimaru, Michiaki Sagae, Yasuomi Hayasi, Rudolf Germer, Kazuyoshi Takayama
    Abstract:

    High-Voltage condensers in a polarity-inversion two-stage Marx surge generator are charged from -40 to -60 kV using a power supply, and the electric charges in the condensers are discharged to an X-ray tube after closing the gap switches in the surge generator using a trigger device. The X-ray tube is a demountable diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Sharp K-series characteristic X-rays of molybdenum are produced without using a monochromatic filter, since the tube utilizes a disk cathode and a rod target, and bremsstrahlung rays are not emitted in the opposite direction to that of electron acceleration. The peak tube Voltage increased with increasing Charging Voltage and increasing space between the target and cathode electrodes. At a Charging Voltage of -60 kV and a target-cathode space of 1.0 mm, the peak tube Voltage and current were 110 kV and 0.75 kA, respectively. The pulse width ranged from 40 to 100 ns, and the maximum dimension of the X-ray source was 3.0 mm in diameter. The number of generator-produced K photons was approximately 7×1014 photons/cm2s at 0.5 m from the source.

  • quasi monochromatic flash x ray generator utilizing weakly ionized linear copper plasma
    Review of Scientific Instruments, 2003
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Toshio Ichimaru, Kazuyoshi Takayama, Yasuomi Hayasi, Rudolf Germer, Hideaki Ido
    Abstract:

    In the plasma flash x-ray generator, a 200 nF condenser is charged up to 50 kV by a power supply, and flash x rays are produced by the disCharging. The x-ray tube is a demountable triode with a trigger electrode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Target evaporation leads to the formation of weakly ionized linear plasma, consisting of copper ions and electrons, around the fine target, and intense characteristic x rays are produced. At a Charging Voltage of 50 kV, the maximum tube Voltage was almost equal to the Charging Voltage of the main condenser, and the peak current was about 20 kA. When the Charging Voltage was increased, the linear plasma formed, and the K-series characteristic x-ray intensities increased. The K lines were quite sharp and intense, and hardly any bremsstrahlung rays were detected at all. The x-ray pulse widths were approximately 700 ns, and the time-integrated x-ray intensity had a value of approximately 30 μC/kg at 1.0 m ...

  • quasi monochromatic flash x ray generator utilizing weakly ionized linear copper plasma
    Review of Scientific Instruments, 2003
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Toshio Ichimaru, Kazuyoshi Takayama, Yasuomi Hayasi, Rudolf Germer, Hideaki Ido
    Abstract:

    In the plasma flash x-ray generator, a 200 nF condenser is charged up to 50 kV by a power supply, and flash x rays are produced by the disCharging. The x-ray tube is a demountable triode with a trigger electrode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Target evaporation leads to the formation of weakly ionized linear plasma, consisting of copper ions and electrons, around the fine target, and intense characteristic x rays are produced. At a Charging Voltage of 50 kV, the maximum tube Voltage was almost equal to the Charging Voltage of the main condenser, and the peak current was about 20 kA. When the Charging Voltage was increased, the linear plasma formed, and the K-series characteristic x-ray intensities increased. The K lines were quite sharp and intense, and hardly any bremsstrahlung rays were detected at all. The x-ray pulse widths were approximately 700 ns, and the time-integrated x-ray intensity had a value of approximately 30 μC/kg at 1.0 m from the x-ray source with a Charging Voltage of 50 kV.

Hidezo Mori - One of the best experts on this subject based on the ideXlab platform.

  • k edge angiography utilizing a tungsten plasma x ray generator in conjunction with gadolinium based contrast media
    Radiation Physics and Chemistry, 2006
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama, Yasuomi Hayasi, Jun Onagawa
    Abstract:

    Abstract The tungsten plasma flash X-ray generator is useful in order to perform high-speed enhanced K-edge angiography using cone beams because K-series characteristic X-rays from the tungsten target are absorbed effectively by gadolinium-based contrast media. In the flash X-ray generator, a 150 nF condenser is charged up to 80 kV by a power supply, and flash X-rays are produced by the disCharging. The X-ray tube is a demountable diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Since the electric circuit of the high-Voltage pulse generator employs a cable transmission line, the high-Voltage pulse generator produces twice the potential of the condenser Charging Voltage. At a Charging Voltage of 80 kV, the estimated maximum tube Voltage and current were approximately 160 kV and 40 kA, respectively. When the Charging Voltage was increased, the characteristic X-ray intensities of tungsten K α lines increased. The K α lines were clean, and hardly any bremsstrahlung rays were detected. The X-ray pulse widths were approximately 110 ns, and the time-integrated X-ray intensity had a value of approximately 0.35 mGy at 1.0 m from the X-ray source with a Charging Voltage of 80 kV. Angiography was performed using a film-less computed radiography (CR) system and gadolinium-based contrast media. In angiography of non-living animals, we observed fine blood vessels of approximately 100 μm with high contrasts.

  • enhanced k edge angiography utilizing tantalum plasma x ray generator in conjunction with gadolinium based contrast media
    Japanese Journal of Applied Physics, 2005
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Yasuomi Hayasi, Koji Kimura, Kazuyoshi Takayama
    Abstract:

    The tantalum plasma flash X-ray generator is useful for performing high-speed enhanced K-edge angiography using cone beams because K-series characteristic X-rays from the tantalum target are absorbed effectively by gadolinium-based contrast media. In the flash X-ray generator, a 150 nF condenser is charged up to 80 kV by a power supply, and flash X-rays are produced by the disCharging. The X-ray tube is a demountable cold-cathode diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Since the electric circuit of the high-Voltage pulse generator employs a cable transmission line, the high-Voltage pulse generator produces twice the potential of the condenser Charging Voltage. At a Charging Voltage of 80 kV, the estimated maximum tube Voltage and current were approximately 160 kV and 40 kA, respectively. When the Charging Voltage was increased, the K-series characteristic X-ray intensities of cerium increased. The K lines were clean and intense, and hardly any bremsstrahlung rays were detected. The X-ray pulse widths were approximately 100 ns, and the time-integrated X-ray intensity had a value of approximately 300 µGy at 1.0 m from the X-ray source with a Charging Voltage of 80 kV. Angiography was performed using a filmless computed radiography (CR) system and gadolinium-based contrast media. In the angiography of nonliving animals, we observed fine blood vessels of approximately 100 µm with high contrasts.

  • quasi monochromatic flash x ray generator utilizing disk cathode molybdenum tube
    Japanese Journal of Applied Physics, 2004
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Shigehiro Sato, Toshio Ichimaru, Michiaki Sagae, Yasuomi Hayasi, Rudolf Germer, Kazuyoshi Takayama
    Abstract:

    High-Voltage condensers in a polarity-inversion two-stage Marx surge generator are charged from -40 to -60 kV using a power supply, and the electric charges in the condensers are discharged to an X-ray tube after closing the gap switches in the surge generator using a trigger device. The X-ray tube is a demountable diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Sharp K-series characteristic X-rays of molybdenum are produced without using a monochromatic filter, since the tube utilizes a disk cathode and a rod target, and bremsstrahlung rays are not emitted in the opposite direction to that of electron acceleration. The peak tube Voltage increased with increasing Charging Voltage and increasing space between the target and cathode electrodes. At a Charging Voltage of -60 kV and a target-cathode space of 1.0 mm, the peak tube Voltage and current were 110 kV and 0.75 kA, respectively. The pulse width ranged from 40 to 100 ns, and the maximum dimension of the X-ray source was 3.0 mm in diameter. The number of generator-produced K photons was approximately 7×1014 photons/cm2s at 0.5 m from the source.

  • quasi monochromatic flash x ray generator utilizing weakly ionized linear copper plasma
    Review of Scientific Instruments, 2003
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Toshio Ichimaru, Kazuyoshi Takayama, Yasuomi Hayasi, Rudolf Germer, Hideaki Ido
    Abstract:

    In the plasma flash x-ray generator, a 200 nF condenser is charged up to 50 kV by a power supply, and flash x rays are produced by the disCharging. The x-ray tube is a demountable triode with a trigger electrode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Target evaporation leads to the formation of weakly ionized linear plasma, consisting of copper ions and electrons, around the fine target, and intense characteristic x rays are produced. At a Charging Voltage of 50 kV, the maximum tube Voltage was almost equal to the Charging Voltage of the main condenser, and the peak current was about 20 kA. When the Charging Voltage was increased, the linear plasma formed, and the K-series characteristic x-ray intensities increased. The K lines were quite sharp and intense, and hardly any bremsstrahlung rays were detected at all. The x-ray pulse widths were approximately 700 ns, and the time-integrated x-ray intensity had a value of approximately 30 μC/kg at 1.0 m ...

  • quasi monochromatic flash x ray generator utilizing weakly ionized linear copper plasma
    Review of Scientific Instruments, 2003
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Toshio Ichimaru, Kazuyoshi Takayama, Yasuomi Hayasi, Rudolf Germer, Hideaki Ido
    Abstract:

    In the plasma flash x-ray generator, a 200 nF condenser is charged up to 50 kV by a power supply, and flash x rays are produced by the disCharging. The x-ray tube is a demountable triode with a trigger electrode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Target evaporation leads to the formation of weakly ionized linear plasma, consisting of copper ions and electrons, around the fine target, and intense characteristic x rays are produced. At a Charging Voltage of 50 kV, the maximum tube Voltage was almost equal to the Charging Voltage of the main condenser, and the peak current was about 20 kA. When the Charging Voltage was increased, the linear plasma formed, and the K-series characteristic x-ray intensities increased. The K lines were quite sharp and intense, and hardly any bremsstrahlung rays were detected at all. The x-ray pulse widths were approximately 700 ns, and the time-integrated x-ray intensity had a value of approximately 30 μC/kg at 1.0 m from the x-ray source with a Charging Voltage of 50 kV.

Toshiaki Kawai - One of the best experts on this subject based on the ideXlab platform.

  • k edge angiography utilizing a tungsten plasma x ray generator in conjunction with gadolinium based contrast media
    Radiation Physics and Chemistry, 2006
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama, Yasuomi Hayasi, Jun Onagawa
    Abstract:

    Abstract The tungsten plasma flash X-ray generator is useful in order to perform high-speed enhanced K-edge angiography using cone beams because K-series characteristic X-rays from the tungsten target are absorbed effectively by gadolinium-based contrast media. In the flash X-ray generator, a 150 nF condenser is charged up to 80 kV by a power supply, and flash X-rays are produced by the disCharging. The X-ray tube is a demountable diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Since the electric circuit of the high-Voltage pulse generator employs a cable transmission line, the high-Voltage pulse generator produces twice the potential of the condenser Charging Voltage. At a Charging Voltage of 80 kV, the estimated maximum tube Voltage and current were approximately 160 kV and 40 kA, respectively. When the Charging Voltage was increased, the characteristic X-ray intensities of tungsten K α lines increased. The K α lines were clean, and hardly any bremsstrahlung rays were detected. The X-ray pulse widths were approximately 110 ns, and the time-integrated X-ray intensity had a value of approximately 0.35 mGy at 1.0 m from the X-ray source with a Charging Voltage of 80 kV. Angiography was performed using a film-less computed radiography (CR) system and gadolinium-based contrast media. In angiography of non-living animals, we observed fine blood vessels of approximately 100 μm with high contrasts.

  • enhanced k edge angiography utilizing tantalum plasma x ray generator in conjunction with gadolinium based contrast media
    Japanese Journal of Applied Physics, 2005
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Yasuomi Hayasi, Koji Kimura, Kazuyoshi Takayama
    Abstract:

    The tantalum plasma flash X-ray generator is useful for performing high-speed enhanced K-edge angiography using cone beams because K-series characteristic X-rays from the tantalum target are absorbed effectively by gadolinium-based contrast media. In the flash X-ray generator, a 150 nF condenser is charged up to 80 kV by a power supply, and flash X-rays are produced by the disCharging. The X-ray tube is a demountable cold-cathode diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Since the electric circuit of the high-Voltage pulse generator employs a cable transmission line, the high-Voltage pulse generator produces twice the potential of the condenser Charging Voltage. At a Charging Voltage of 80 kV, the estimated maximum tube Voltage and current were approximately 160 kV and 40 kA, respectively. When the Charging Voltage was increased, the K-series characteristic X-ray intensities of cerium increased. The K lines were clean and intense, and hardly any bremsstrahlung rays were detected. The X-ray pulse widths were approximately 100 ns, and the time-integrated X-ray intensity had a value of approximately 300 µGy at 1.0 m from the X-ray source with a Charging Voltage of 80 kV. Angiography was performed using a filmless computed radiography (CR) system and gadolinium-based contrast media. In the angiography of nonliving animals, we observed fine blood vessels of approximately 100 µm with high contrasts.

  • quasi monochromatic flash x ray generator utilizing disk cathode molybdenum tube
    Japanese Journal of Applied Physics, 2004
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Shigehiro Sato, Toshio Ichimaru, Michiaki Sagae, Yasuomi Hayasi, Rudolf Germer, Kazuyoshi Takayama
    Abstract:

    High-Voltage condensers in a polarity-inversion two-stage Marx surge generator are charged from -40 to -60 kV using a power supply, and the electric charges in the condensers are discharged to an X-ray tube after closing the gap switches in the surge generator using a trigger device. The X-ray tube is a demountable diode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Sharp K-series characteristic X-rays of molybdenum are produced without using a monochromatic filter, since the tube utilizes a disk cathode and a rod target, and bremsstrahlung rays are not emitted in the opposite direction to that of electron acceleration. The peak tube Voltage increased with increasing Charging Voltage and increasing space between the target and cathode electrodes. At a Charging Voltage of -60 kV and a target-cathode space of 1.0 mm, the peak tube Voltage and current were 110 kV and 0.75 kA, respectively. The pulse width ranged from 40 to 100 ns, and the maximum dimension of the X-ray source was 3.0 mm in diameter. The number of generator-produced K photons was approximately 7×1014 photons/cm2s at 0.5 m from the source.

  • quasi monochromatic flash x ray generator utilizing weakly ionized linear copper plasma
    Review of Scientific Instruments, 2003
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Toshio Ichimaru, Kazuyoshi Takayama, Yasuomi Hayasi, Rudolf Germer, Hideaki Ido
    Abstract:

    In the plasma flash x-ray generator, a 200 nF condenser is charged up to 50 kV by a power supply, and flash x rays are produced by the disCharging. The x-ray tube is a demountable triode with a trigger electrode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Target evaporation leads to the formation of weakly ionized linear plasma, consisting of copper ions and electrons, around the fine target, and intense characteristic x rays are produced. At a Charging Voltage of 50 kV, the maximum tube Voltage was almost equal to the Charging Voltage of the main condenser, and the peak current was about 20 kA. When the Charging Voltage was increased, the linear plasma formed, and the K-series characteristic x-ray intensities increased. The K lines were quite sharp and intense, and hardly any bremsstrahlung rays were detected at all. The x-ray pulse widths were approximately 700 ns, and the time-integrated x-ray intensity had a value of approximately 30 μC/kg at 1.0 m ...

  • quasi monochromatic flash x ray generator utilizing weakly ionized linear copper plasma
    Review of Scientific Instruments, 2003
    Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Toshio Ichimaru, Kazuyoshi Takayama, Yasuomi Hayasi, Rudolf Germer, Hideaki Ido
    Abstract:

    In the plasma flash x-ray generator, a 200 nF condenser is charged up to 50 kV by a power supply, and flash x rays are produced by the disCharging. The x-ray tube is a demountable triode with a trigger electrode, and the turbomolecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Target evaporation leads to the formation of weakly ionized linear plasma, consisting of copper ions and electrons, around the fine target, and intense characteristic x rays are produced. At a Charging Voltage of 50 kV, the maximum tube Voltage was almost equal to the Charging Voltage of the main condenser, and the peak current was about 20 kA. When the Charging Voltage was increased, the linear plasma formed, and the K-series characteristic x-ray intensities increased. The K lines were quite sharp and intense, and hardly any bremsstrahlung rays were detected at all. The x-ray pulse widths were approximately 700 ns, and the time-integrated x-ray intensity had a value of approximately 30 μC/kg at 1.0 m from the x-ray source with a Charging Voltage of 50 kV.