The Experts below are selected from a list of 4530 Experts worldwide ranked by ideXlab platform
Eiichi Sato - One of the best experts on this subject based on the ideXlab platform.
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mcps range photon counting X Ray computed tomography system utilizing an oscillating linear yap ce photon detector
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2011Co-Authors: Yasuyuki Oda, Eiichi Sato, Hiroshi Matsukiyo, Akihiro Osawa, Toshiyuki Enomoto, Manabu Watanabe, Abulajiang Abudurexiti, Osahiko Hagiwara, Shinya Kusachi, Shigeaki SugimuraAbstract:Abstract High-speed X-Ray photon counting is useful for discriminating photon energy, and the counting can be used for constructing an X-Ray computed tomography (CT) system. A photon-counting X-Ray CT system consists of an X-Ray Generator, a turntable, an oscillation linear detector, a two-stage controller, a multipiXel photon counter (MPPC) module, a 1.0 mm-thick crystal (scintillator) of YAP(Ce) (cerium-doped yttrium aluminum perovskite), a counter card (CC), and a personal computer (PC). Tomography is accomplished by repeating the linear scanning and the rotation of an object, and projection curves of the object are obtained by the linear scanning using the detector consisting of an MPPC module, the YAP(Ce), and a scan stage. The pulses of the event signal from the module are counted by the CC in conjunction with the PC. Because the lower level of the photon energy was roughly determined by a comparator in the module, the average photon energy of the X-Ray spectra increased with increase in the lower-level voltage of the comparator at a constant tube voltage. The maXimum count rate was approXimately 3 Mcps (mega counts per second), and photon-counting CT was carried out.
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first demonstration of 10 kev width energy discrimination k edge radiography using a cadmium telluride X Ray camera with a tungsten target tube
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2011Co-Authors: Manabu Watanabe, Eiichi Sato, Hiroshi Matsukiyo, Akihiro Osawa, Toshiyuki Enomoto, Jiro Nagao, Purkhet Abderyim, Abulajiang Abudurexiti, Osahiko Hagiwara, Shigehiro SatoAbstract:Abstract Energy-discrimination X-Ray camera is useful to perform monochromatic radiography using polychromatic X-Rays. This X-Ray camera was developed to carry out K-edge radiography using cerium and gadolinium-based contrast media. In this camera, objects are irradiated by a cone beam from a tungsten-target X-Ray Generator, and penetrating X-Ray photons are detected by a cadmium-telluride detector with amplifiers. Both optimal photon-energy level and energy width are selected using a multichannel analyzer, and the photon number is counted by a counter card. Radiography was performed by the detector scanning using an X – y stage driven by a two-stage controller, and radiograms were shown on a personal computer monitor. In radiography, tube voltage and current were 90 kV and 5.8 μA, respectively, and the X-Ray intensity was 0.61 μGy/s at 1.0 m from the X-Ray source. The K-edge energies of cerium and gadolinium are 40.3 and 50.3 keV, respectively, and 10 keV-width enhanced K-edge radiography was performed using X-Ray photons with energies just beyond K-edge energies of cerium and gadolinium. Thus, cerium K-edge radiography was carried out using X-Ray photons with an energy range from 40.3 to 50. 3 keV, and gadolinium K-edge radiography was accomplished utilizing photon energies ranging from 50.3 to 60.3 keV.
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magnification embossed radiography utilizing image shifting subtraction program
Japanese Journal of Applied Physics, 2010Co-Authors: Akihiro Osawa, Eiichi Sato, Etsuro Tanaka, Hiroshi Matsukiyo, Toshiyuki Enomoto, Jiro Nagao, Manabu Watanabe, Purkhet Abderyim, Katsuo Aizawa, Hidezo MoriAbstract:We developed an image-shifting subtraction program and carried out magnification embossed radiography (MER) utilizing single- and dual-energy subtractions. In particular, dual-energy subtraction was carried out to decrease the absorption contrast of unnecessary regions. The contrast resolution of the target region was increased by the use of subtraction software and a linear-contrast system in a flat-panel detector (FPD). The X-Ray Generator had a 100-µm-focus tube, and the subtractions were performed at tube voltages of 40 and 70 kV, a tube current of 0.50 mA, and an X-Ray eXposure time of 5.0 s. MER images with threefold magnification were obtained using the FPD with a piXel size of 48×48 µm2, and the shifting dimensions of the imaged object in the horizontal and vertical directions ranged from 48 to 192 µm. At a shifting distance ranging from 48 to 144 µm, the spatial resolutions in the horizontal and vertical directions measured with a lead test chart were both 50 µm. In the MER of nonliving animals, we obtained high-contrast embossed images of fine bones, gadolinium oXide particles in blood vessels, and iodine-based microspheres in coronary arteries of approXimately 100 µm diameter.
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energy discriminating X Ray camera utilizing a cadmium telluride detector
Optical Engineering, 2009Co-Authors: Eiichi Sato, Abderyim Purkhet, Hiroshi Matsukiyo, Akihiro Osawa, Toshiyuki Enomoto, Manabu Wantanabe, Jiro Nagao, Seiichiro Nomiya, Keitaro Hitomi, Etsuro TanakaAbstract:An energy-discriminating X-Ray camera is useful for performing monochromatic radiography using polychromatic X Rays. This X-Ray camera was developed to carry out K-edge radiography using iodine-based contrast media. In this camera, objects are eXposed by a cone beam from a cerium X-Ray Generator, and penetrating X-Ray photons are detected by a cadmium telluride detector with an amplifier unit. The optimal X-Ray photon energy and the energy width are selected out using a multichannel analyzer, and the photon number is counted by a counter card. Radiography was performed by the detector scanning using an X-y stage driven by a two-stage controller, and radiograms obtained by energy discriminating are shown on a personal computer monitor. In radiography, the tube voltage and current were 60 kV and 36 µA, respectively, and the X-Ray intensity was 4.7 µGy/s. Cerium K-series characteristic X Rays are absorbed effectively by iodine-based contrast media, and iodine K-edge radiography was performed using X Rays with energies just beyond iodine K-edge energy 33.2 keV.
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k edge angiography utilizing a tungsten plasma X Ray Generator in conjunction with gadolinium based contrast media
Radiation Physics and Chemistry, 2006Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama, Yasuomi Hayasi, Jun OnagawaAbstract: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.
Kazuyoshi Takayama - One of the best experts on this subject based on the ideXlab platform.
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k edge angiography utilizing a tungsten plasma X Ray Generator in conjunction with gadolinium based contrast media
Radiation Physics and Chemistry, 2006Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama, Yasuomi Hayasi, Jun OnagawaAbstract: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.
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characteristic X Ray Generator utilizing angle dependence of bremsstrahlung X Ray distribution
Japanese Journal of Applied Physics, 2006Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama, Jun OnagawaAbstract:This Generator consists of the following components: a constant high-voltage power supply, a filament power supply, a turbomolecular pump, and an X-Ray tube. The X-Ray tube is a demountable diode which is connected to the turbomolecular pump and consists of the following major devices: a molybdenum rod target, a tungsten hairpin cathode (filament), a focusing (Wehnelt) electrode, a polyethylene terephthalate X-Ray window 0.25 mm in thickness, and a stainless-steel tube body. In the X-Ray tube, the positive high voltage is applied to the anode (target) electrode, and the cathode is connected to the tube body (ground potential). In this eXperiment, the tube voltage applied was from 22 to 36 kV, and the tube current was regulated to within 100 µA by the filament temperature. The eXposure time is controlled in order to obtain optimum X-Ray intensity. The electron beams from the cathode are converged to the target by the focusing electrode, and clean K-series characteristic X-Rays are produced through the focusing electrode without using a filter. The X-Ray intensity was 26.6 µGy/s at 1.0 m from the X-Ray source with a tube voltage of 30 kV and a tube current of 100 µA, and quasi-monochromatic radiography was performed using a computed radiography system.
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Tunable narrow-photon-energy X-Ray Generator utilizing a tungsten-target tube
Radiation Physics and Chemistry, 2006Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Kazuyoshi Takayama, Hiroshi Sugiyama, Masami Ando, Jun OnagawaAbstract:Abstract A preliminary eXperiment for producing narrow-photon-energy cone-beam X-Rays using a silicon single crystal is described. In order to produce low-photon-energy X-Rays, a 100-μm-focus X-Ray Generator in conjunction with a (1 1 1) plane silicon crystal is employed. The X-Ray Generator consists of a main controller and a unit with a high-voltage circuit and a microfocus X-Ray tube. The maXimum tube voltage and current were 35 kV and 0.50 mA, respectively, and the X-Ray intensity of the microfocus Generator was 48.3 μGy/s at 1.0 m from the source with a tube voltage of 30 kV and a current of 0.50 mA. The effective photon energy is determined by Bragg's angle, and the photon-energy width is regulated by the angle delta. Using this Generator in conjunction with a computed radiography system, quasi-monochromatic radiography was performed using a cone beam with an effective energy of approXimately 17 keV.
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enhanced k edge angiography utilizing tantalum plasma X Ray Generator in conjunction with gadolinium based contrast media
Japanese Journal of Applied Physics, 2005Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Yasuomi Hayasi, Koji Kimura, Kazuyoshi TakayamaAbstract: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.
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compact monochromatic flash X Ray Generator utilizing a disk cathode molybdenum tube
Medical Physics, 2004Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Shigehiro Sato, Toshio Ichimaru, Kazuyoshi Takayama, Hideaki IdoAbstract:The high-voltage condensers in a polarity-inversion two-stage MarX surge Generator are charged from -50 to -70 kV by a power supply, and the electric charges in the condensers are discharged to an X-Ray tube after closing gap switches in the surge Generator with a trigger device. The X-Ray tube is a demountable diode, and the turbo molecular pump evacuates air from the tube with a pressure of approXimately 1 mPa. Clean molybdenum K{alpha} lines are produced using a 20 {mu}m-thick zirconium 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. At a charging voltage of -70 kV, the instantaneous tube voltage and current were 120 kV and 1.0 kA, respectively. The X-Ray pulse widths were approXimately 70 ns, and the Generator produced instantaneous number of K{alpha} photons was approXimately 3X10{sup 7} photons/cm{sup 2} per pulse at 0.5 m from the source of 3.0 mm in diameter.
Hideaki Ido - One of the best experts on this subject based on the ideXlab platform.
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compact monochromatic flash X Ray Generator utilizing a disk cathode molybdenum tube
Medical Physics, 2004Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Shigehiro Sato, Toshio Ichimaru, Kazuyoshi Takayama, Hideaki IdoAbstract:The high-voltage condensers in a polarity-inversion two-stage MarX surge Generator are charged from -50 to -70 kV by a power supply, and the electric charges in the condensers are discharged to an X-Ray tube after closing gap switches in the surge Generator with a trigger device. The X-Ray tube is a demountable diode, and the turbo molecular pump evacuates air from the tube with a pressure of approXimately 1 mPa. Clean molybdenum K{alpha} lines are produced using a 20 {mu}m-thick zirconium 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. At a charging voltage of -70 kV, the instantaneous tube voltage and current were 120 kV and 1.0 kA, respectively. The X-Ray pulse widths were approXimately 70 ns, and the Generator produced instantaneous number of K{alpha} photons was approXimately 3X10{sup 7} photons/cm{sup 2} per pulse at 0.5 m from the source of 3.0 mm in diameter.
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Demonstration of enhanced K-edge angiography using a cerium target X-Ray Generator.
Medical physics, 2004Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Shigehiro Sato, Toshio Ichimaru, Kazuyoshi Takayama, Hideaki IdoAbstract:The cerium target X-Ray Generator is useful in order to perform enhanced K-edge angiography using a cone beam because K-series characteristic X Rays from the cerium target are absorbed effectively by iodine-based contrast mediums. The X-Ray Generator consists of a main controller, a unit with a Cockcroft-Walton circuit and a fiXed anode X-Ray tube, and a personal computer. The tube is a glass-enclosed diode with a cerium target and a 0.5−mm-thick beryllium window. The maXimum tube voltage and current were 65kV and 0.4mA, respectively, and the focal-spot sizes were 1.0×1.3mm. Cerium Kα lines were left using a barium sulfate filter, and the X-Ray intensity was 0.48μC/kg at 1.0m from the source with a tube voltage of 60kV, a current of 0.40mA, and an eXposure time of 1.0s. Angiography was performed with a computed radiography system using iodine-based microspheres. In coronary angiography of nonliving animals, we observed fine blood vessels of approXimately 100μm with high contrasts.
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quasi monochromatic flash X Ray Generator utilizing weakly ionized linear copper plasma
Review of Scientific Instruments, 2003Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Toshio Ichimaru, Kazuyoshi Takayama, Yasuomi Hayasi, Rudolf Germer, Hideaki IdoAbstract: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 ...
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quasi monochromatic flash X Ray Generator utilizing weakly ionized linear copper plasma
Review of Scientific Instruments, 2003Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Toshio Ichimaru, Kazuyoshi Takayama, Yasuomi Hayasi, Rudolf Germer, Hideaki IdoAbstract: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.
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magnification embossed radiography utilizing image shifting subtraction program
Japanese Journal of Applied Physics, 2010Co-Authors: Akihiro Osawa, Eiichi Sato, Etsuro Tanaka, Hiroshi Matsukiyo, Toshiyuki Enomoto, Jiro Nagao, Manabu Watanabe, Purkhet Abderyim, Katsuo Aizawa, Hidezo MoriAbstract:We developed an image-shifting subtraction program and carried out magnification embossed radiography (MER) utilizing single- and dual-energy subtractions. In particular, dual-energy subtraction was carried out to decrease the absorption contrast of unnecessary regions. The contrast resolution of the target region was increased by the use of subtraction software and a linear-contrast system in a flat-panel detector (FPD). The X-Ray Generator had a 100-µm-focus tube, and the subtractions were performed at tube voltages of 40 and 70 kV, a tube current of 0.50 mA, and an X-Ray eXposure time of 5.0 s. MER images with threefold magnification were obtained using the FPD with a piXel size of 48×48 µm2, and the shifting dimensions of the imaged object in the horizontal and vertical directions ranged from 48 to 192 µm. At a shifting distance ranging from 48 to 144 µm, the spatial resolutions in the horizontal and vertical directions measured with a lead test chart were both 50 µm. In the MER of nonliving animals, we obtained high-contrast embossed images of fine bones, gadolinium oXide particles in blood vessels, and iodine-based microspheres in coronary arteries of approXimately 100 µm diameter.
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energy discriminating X Ray camera utilizing a cadmium telluride detector
Optical Engineering, 2009Co-Authors: Eiichi Sato, Abderyim Purkhet, Hiroshi Matsukiyo, Akihiro Osawa, Toshiyuki Enomoto, Manabu Wantanabe, Jiro Nagao, Seiichiro Nomiya, Keitaro Hitomi, Etsuro TanakaAbstract:An energy-discriminating X-Ray camera is useful for performing monochromatic radiography using polychromatic X Rays. This X-Ray camera was developed to carry out K-edge radiography using iodine-based contrast media. In this camera, objects are eXposed by a cone beam from a cerium X-Ray Generator, and penetrating X-Ray photons are detected by a cadmium telluride detector with an amplifier unit. The optimal X-Ray photon energy and the energy width are selected out using a multichannel analyzer, and the photon number is counted by a counter card. Radiography was performed by the detector scanning using an X-y stage driven by a two-stage controller, and radiograms obtained by energy discriminating are shown on a personal computer monitor. In radiography, the tube voltage and current were 60 kV and 36 µA, respectively, and the X-Ray intensity was 4.7 µGy/s. Cerium K-series characteristic X Rays are absorbed effectively by iodine-based contrast media, and iodine K-edge radiography was performed using X Rays with energies just beyond iodine K-edge energy 33.2 keV.
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k edge angiography utilizing a tungsten plasma X Ray Generator in conjunction with gadolinium based contrast media
Radiation Physics and Chemistry, 2006Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama, Yasuomi Hayasi, Jun OnagawaAbstract: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.
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characteristic X Ray Generator utilizing angle dependence of bremsstrahlung X Ray distribution
Japanese Journal of Applied Physics, 2006Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama, Jun OnagawaAbstract:This Generator consists of the following components: a constant high-voltage power supply, a filament power supply, a turbomolecular pump, and an X-Ray tube. The X-Ray tube is a demountable diode which is connected to the turbomolecular pump and consists of the following major devices: a molybdenum rod target, a tungsten hairpin cathode (filament), a focusing (Wehnelt) electrode, a polyethylene terephthalate X-Ray window 0.25 mm in thickness, and a stainless-steel tube body. In the X-Ray tube, the positive high voltage is applied to the anode (target) electrode, and the cathode is connected to the tube body (ground potential). In this eXperiment, the tube voltage applied was from 22 to 36 kV, and the tube current was regulated to within 100 µA by the filament temperature. The eXposure time is controlled in order to obtain optimum X-Ray intensity. The electron beams from the cathode are converged to the target by the focusing electrode, and clean K-series characteristic X-Rays are produced through the focusing electrode without using a filter. The X-Ray intensity was 26.6 µGy/s at 1.0 m from the X-Ray source with a tube voltage of 30 kV and a tube current of 100 µA, and quasi-monochromatic radiography was performed using a computed radiography system.
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Tunable narrow-photon-energy X-Ray Generator utilizing a tungsten-target tube
Radiation Physics and Chemistry, 2006Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Kazuyoshi Takayama, Hiroshi Sugiyama, Masami Ando, Jun OnagawaAbstract:Abstract A preliminary eXperiment for producing narrow-photon-energy cone-beam X-Rays using a silicon single crystal is described. In order to produce low-photon-energy X-Rays, a 100-μm-focus X-Ray Generator in conjunction with a (1 1 1) plane silicon crystal is employed. The X-Ray Generator consists of a main controller and a unit with a high-voltage circuit and a microfocus X-Ray tube. The maXimum tube voltage and current were 35 kV and 0.50 mA, respectively, and the X-Ray intensity of the microfocus Generator was 48.3 μGy/s at 1.0 m from the source with a tube voltage of 30 kV and a current of 0.50 mA. The effective photon energy is determined by Bragg's angle, and the photon-energy width is regulated by the angle delta. Using this Generator in conjunction with a computed radiography system, quasi-monochromatic radiography was performed using a cone beam with an effective energy of approXimately 17 keV.
Hidezo Mori - One of the best experts on this subject based on the ideXlab platform.
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magnification embossed radiography utilizing image shifting subtraction program
Japanese Journal of Applied Physics, 2010Co-Authors: Akihiro Osawa, Eiichi Sato, Etsuro Tanaka, Hiroshi Matsukiyo, Toshiyuki Enomoto, Jiro Nagao, Manabu Watanabe, Purkhet Abderyim, Katsuo Aizawa, Hidezo MoriAbstract:We developed an image-shifting subtraction program and carried out magnification embossed radiography (MER) utilizing single- and dual-energy subtractions. In particular, dual-energy subtraction was carried out to decrease the absorption contrast of unnecessary regions. The contrast resolution of the target region was increased by the use of subtraction software and a linear-contrast system in a flat-panel detector (FPD). The X-Ray Generator had a 100-µm-focus tube, and the subtractions were performed at tube voltages of 40 and 70 kV, a tube current of 0.50 mA, and an X-Ray eXposure time of 5.0 s. MER images with threefold magnification were obtained using the FPD with a piXel size of 48×48 µm2, and the shifting dimensions of the imaged object in the horizontal and vertical directions ranged from 48 to 192 µm. At a shifting distance ranging from 48 to 144 µm, the spatial resolutions in the horizontal and vertical directions measured with a lead test chart were both 50 µm. In the MER of nonliving animals, we obtained high-contrast embossed images of fine bones, gadolinium oXide particles in blood vessels, and iodine-based microspheres in coronary arteries of approXimately 100 µm diameter.
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k edge angiography utilizing a tungsten plasma X Ray Generator in conjunction with gadolinium based contrast media
Radiation Physics and Chemistry, 2006Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama, Yasuomi Hayasi, Jun OnagawaAbstract: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.
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characteristic X Ray Generator utilizing angle dependence of bremsstrahlung X Ray distribution
Japanese Journal of Applied Physics, 2006Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Kazuyoshi Takayama, Jun OnagawaAbstract:This Generator consists of the following components: a constant high-voltage power supply, a filament power supply, a turbomolecular pump, and an X-Ray tube. The X-Ray tube is a demountable diode which is connected to the turbomolecular pump and consists of the following major devices: a molybdenum rod target, a tungsten hairpin cathode (filament), a focusing (Wehnelt) electrode, a polyethylene terephthalate X-Ray window 0.25 mm in thickness, and a stainless-steel tube body. In the X-Ray tube, the positive high voltage is applied to the anode (target) electrode, and the cathode is connected to the tube body (ground potential). In this eXperiment, the tube voltage applied was from 22 to 36 kV, and the tube current was regulated to within 100 µA by the filament temperature. The eXposure time is controlled in order to obtain optimum X-Ray intensity. The electron beams from the cathode are converged to the target by the focusing electrode, and clean K-series characteristic X-Rays are produced through the focusing electrode without using a filter. The X-Ray intensity was 26.6 µGy/s at 1.0 m from the X-Ray source with a tube voltage of 30 kV and a tube current of 100 µA, and quasi-monochromatic radiography was performed using a computed radiography system.
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Tunable narrow-photon-energy X-Ray Generator utilizing a tungsten-target tube
Radiation Physics and Chemistry, 2006Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Kazuyoshi Takayama, Hiroshi Sugiyama, Masami Ando, Jun OnagawaAbstract:Abstract A preliminary eXperiment for producing narrow-photon-energy cone-beam X-Rays using a silicon single crystal is described. In order to produce low-photon-energy X-Rays, a 100-μm-focus X-Ray Generator in conjunction with a (1 1 1) plane silicon crystal is employed. The X-Ray Generator consists of a main controller and a unit with a high-voltage circuit and a microfocus X-Ray tube. The maXimum tube voltage and current were 35 kV and 0.50 mA, respectively, and the X-Ray intensity of the microfocus Generator was 48.3 μGy/s at 1.0 m from the source with a tube voltage of 30 kV and a current of 0.50 mA. The effective photon energy is determined by Bragg's angle, and the photon-energy width is regulated by the angle delta. Using this Generator in conjunction with a computed radiography system, quasi-monochromatic radiography was performed using a cone beam with an effective energy of approXimately 17 keV.
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enhanced k edge angiography utilizing tantalum plasma X Ray Generator in conjunction with gadolinium based contrast media
Japanese Journal of Applied Physics, 2005Co-Authors: Eiichi Sato, Etsuro Tanaka, Hidezo Mori, Toshiaki Kawai, Takashi Inoue, Akira Ogawa, Shigehiro Sato, Yasuomi Hayasi, Koji Kimura, Kazuyoshi TakayamaAbstract: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.
