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1987 Fiscal Year Final Research Report Summary

Fundamental Studies for the High Intensity Flash X-ray generators for Biomedical Radiography

Research Project

Project/Area Number 60480256
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Radiation science
Research InstitutionDepartment of Physics, School of General Education, Iwate Medical University

Principal Investigator

ISOBE Hiroshi  Department of Physics, School of General Education, Iwate Medical University, 教養部物理, 教授 (70048221)

Co-Investigator(Kenkyū-buntansha) KAWASAKI Satoshi  Department of Physics, School of General Education, Iwate Medical University, 教養部物理, 助手 (70195072)
FUJIYAMA Toshiaki  Department of Pyhsics, School of General Education, Iwate Medical University, 教養部物理, 助手 (20173479)
SATO Sanae  Department of Physics, School of General Education, Iwate Medical University, 教養部物理, 助手 (50154050)
SATO Eiichi  Department of Physics, School of General Education, Iwate Medical University, 教養部物理, 講師 (90154038)
Project Period (FY) 1985 – 1987
Keywordsflash x-ray / field emission / biomedical radiography / high speed image analysis / spectrum control / repetitional type / スペクトルコントロール / 画像処理 / 三次元画像解析 / エネルギーサブトラクション / 連続遅延写真
Research Abstract

Fundamental studies for the high intensity flash x-ray generators for biomedical radiography are described. The single flash x-ray generators are as follows: (a) a high intensity type (less than 100kV) for performing the soft radiography, (b) a low-impedance and high intensity type (less than 120kV) for obtaining radiographs of tissues deep inside of the human body, and (c) a portable type (less than 200kV). Each generators had the control functions for the x-ray intensity, the spectrum distribution, and the effective focal spot size, and mainly consisted of the following essential components: a high voltage generator, a pulse condenser, a gas gap system, a turbo molecular pump, and a flash x-ray tube using field emission.
Two types of the triple-pulsed x-ray generators consisted of the following components: a high-voltage generating unit, a voltage divider unit, three high-voltage generating unit, three high-voltage pulsers used for a portable generator, a tiple parallel impulse switch … More ing system, a high-power gas diode having three terminals, a turbo molecular pump, and three remote x-ray tubes having cold cathode. For the single-tube generator, the pulsers were charged to the same or different voltages by using a voltage divider unit and were connected to the x-ray tube through a high-power gas diode using SF_6. For the triple-tube generator,since three pulsers were connected directly to the tubes without a diode, three x-ray outputs could be obtained simultaneously. The minimum time intervals for the single-tube and the triple-tube types were about 100 and 3us, respectively. The x-ray intensities increased in proportion to the third or fourth power of the charging voltage. The pulse width was less than 300ns, and the x-ray quality (average spectrum distribution) became hard according to increases in the charging voltage and increases in the thickness of metal filters inserted outside of the x-ray window. The effective focal spot size could be reduced by decreasing the anode angle, decreasing the cathode diameter, decreasing the anode-cathode space, and inserting the metal filters.
The high-speed radiographic system consisted of the following components: two types of delay switches,i. e. (a) direct switching and (b) laser switching, a delayed pulse generator, a CR system,and an FX generator. When the radiographic object triggered the delay switch, a short electric pulse was produced and was transmitted to the delayed pulse generator. An accurate delayed x-ray pulse was produced when the delayed pulse was transmitted to the high-speed impulse switching system. Next, when the radiographic object was exposed to the controlled x-rays under the optimum radiographic conditions, the permeating x-rays produced the digital image. Since the time resolutions for two types of delay switches were less than 20ns, the total time resolution for the x-ray production was less than 1<micrn>s. Various kinds of high speed biomedical radiography, e. g., the stroboscopic radiographgs, the continuous delayed radiographs the energy subtraction radiographs, and the continuous three-dimensional analysis could be performed by controlling the radiographic conditions. Less

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Sato, E.;Isobe, H;Oikawa, S.;Yanagisawa, T. et al.: Jpn. J. Med. Imaging and Information Sci.3. 62-73 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sato, E.;Isobe, H;Hoshino, F.: Rev. Sci. Instrum.57. 1399-1408 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Isobe, H.;Sato, E.;Tanifuji, E;T. Fujuyama. et al.: Jpn. J. Med. Imaging and Information Sci.3. 145-155 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sato, E.;Isobe, H;Fujuyama, T.;Sato, S. et al.: Jpn. Radiol. Phys.7. 7-20 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sato, E.;Isobe, H;Yanagisawa, T.: SPIE. 832. 180-187 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Isobe, H.;Sato, E.;Yanagisawa, T.: SPIE. 832. 151-160 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 磯部寛, 佐藤英一: "医用高出力フラッシュX線装置の開発" 岩手医科大学教養部, 351 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sato,E., Isobe,H., Oikawa,S., Yanagisawa,T., et al.: "Contruction of the Serial-Exposure Type of High Intensity Flash X-ray Generator Having Variable Energies for Biomedecal Radiography" Jpn. J. Med. Imaging and Information Sd.3. 62-73 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sato,E., Isobe,H. and Hoshino,F.: "A High Intensity Flash X-ray Apparatus for Biomedical Radiography" Rev. Sci. Instrum.57. 1399-1408 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Isobe,H., Sato,E., Tanifuji,E., Fujiyama,T., et al.: "A Low Impedance and High Intensity Flash X-ray Generator for Biomedical Radiography" Jpn. J. Med. Imaging and Information Sci.3. 145-155 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sato,E., Isobe,H., Fujiyama,T., Sato,S., et al.: "Flash X-ray TEchniques for Biomedical Radiography" Jpn. Radiol. Phys.7. 7-20 (1897)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Isobe,H., Sato,E. and Yanagisawa,T.: "Biomedical Flash Radiography" SPIE. 832. 151-160 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Isobe,H. and Sato,E.: School of General Education, Iwate Medical University. High Intensity Flash X-ray Generator for Biomedical Radiography, 351 (1987)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1989-03-30  

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