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1995 Fiscal Year Final Research Report Summary

Development of the semiconductor array type diagnostic x-ray imaging device for the purpose of the reduction of patient dose

Research Project

Project/Area Number 05557114
Research Category

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

Allocation TypeSingle-year Grants
Research Field Medical sociology
Research InstitutionKyoto Institute of Technology

Principal Investigator

KANAMORI Hitoshi  Kyoto Inst.Tech., Electronic & Information Science, professor, 工芸学部, 教授 (70027770)

Co-Investigator(Kenkyū-buntansha) SATO Toshiyuki  Shimadzu Co., chief research staff, 中央研究所, 主任
TAKIGAWA Atsushi  Hiroshima Pref.College of Health and Welfare, associate professor, 助教授 (80197227)
MATSUMOTO Masao  Osaka Univ., Faculty of Medicine, associate professor, 医学部, 助教授 (50149944)
NAKAMORI Nobuyuki  Kyoto Inst.Tech., Electronic & Information Science, associate professor, 工芸学部, 助教授 (20107353)
YAMADA Masayoshi  Kyoto Inst.Tech., Electronic & Information Science, professor, 工芸学部, 教授 (70029320)
Project Period (FY) 1993 – 1995
Keywordsx-ray imaging / patient dose / semiconductor array
Research Abstract

(1)Selection of the dopant of CdTe detector
We found that the detector made using Cl-doped crystal was most adequate for the diagnostic imaging device by comparisons of the dopants of In and Ga by the reason of good photon counting response.
(2)Clinical application of a CdTe detector array
Digital breast image were made by using a multichannel Cl-doped detector array having 768*4 pixels with 500 mum intervals. Clinical image quality of lung and heart was better than the quality of conventional x-ray images.
(3)Measurement of scattered x-ray spectra impinged into the the pixel of an image plane
By using a conical collimator of 45゚ angle and a beam stopper, we separated the x-ray spectra into primary and scattered components at a given point of the image plane. When an anti-scatter grid was applied to this measurement, we also could separate the spectra.
(4)Calculation of scattered x-ray spectra impinged into the the pixel of an image plane
Bucky factors and contrast improvement factors were obtained by the results of the scattered x-ray spectra calculated by the Monte Carlo method under the presence of a grid.
(5)Relation between scatter fraction, image contrast and dose
We proposed the contrast-dose diagram which indicated the relation between image contrast and dose for various scatter fractions. By using this diagram we can find the optimum scatter fraction for minimum dose. This method was applied in the clinical radiograph of Sella Turcica in a head phantom.
(6)Analysis of the radiographic mottle
Radiographic mottle, one of the important factor for the x-ray image quality, diminishes the delectability of low-contrast objects. We obtained and explained the tube voltage dependence for the mottle of low and high speed screen/film systems.

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Hideaki Kubota: "Determination of x-ray tube focal spot positions" Medical Physics. 20. 1029-1031 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Atsushi Takigawa: "Effects of scattered x-rays upon radiographic contrast and patient dose" Journal of Photographic Science. 41. 134-136 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hideaki Kubota: "Experimental separation of diagnostic x-ray spectra into scatter and primary components" Medical & Biological Engineering & Computing. 32. 468-472 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Toshiyuki Sato: "Influence of dopants on characteristics of x-ray detectors fabricated from In,Ga & Cl-doped CdTe" Japanese Journal of Applied Physics. 34. 4264-4268 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tosiyuki Sato: "Local polarization phenomena in In-doped CdTe x-ray detector arrays" IEEE Transactions on Nuclear Science. 42. 1513-1518 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Atsushi Takigaea: "Measurement of scattered x-ray spectrum for the evaluation of radiographic contrast" Journal of Photographic Science. 44. 31-34 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 金森仁志: "医学物理データブック 4.1X線" 日本医学放射線物理学会, 15 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kubota, Y.Ozaki, M.Matsumoto and H.Kanamori: "Determination of x-ray tube focal spot positions" Medical Physics. 20. 1029-1031 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Takigawa K.Yamashita.T.Ishida.M.Matsumoto and H.Kanamori: "Effects of scattered x-ray upon radiographic contrast and patient dose" Journal of Photographic Science. 41. 134-136 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kubota, Y.Ozaki, M.Matsumoto and H.Kanamori: "Experimental separation of diagnostic x-ray spectra into scatter and primary components" Medical & Biological Engineering & Computing. 32. 468-472 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sato, K.Sato, S.Ishida, M.Ukita, M.Yamada and H.Kanamori: "Influence of dopants on characteristics of x-ray detectors fabricated from In, Ga & Cl-doped CdTe" Japanese Journal of Applied Physics. 34. 4264-4268 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sato, K.Sato, S.Ishida, M.Kiri, M.Hirooka, M.Yamada and H.Kanamori: "Local polarization phenomena in In-doped CdTe x-ray detector arrays" IEEE Transaction on Nuclear Science. 42. 1513-1518 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Takigawa, Y.Nishikawa, H.Kubota, Y.Ozaki, M.Matsumoto and H.Kanamori: "Measurement of scattered x-ray spectrum for the evaluaiton of radiographic contrast" Journal of Photographic Science. 44. 31-34 (1996)

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

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Published: 1997-03-04  

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