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X-RAY CT DEVICE, METHOD FOR MEASURING ELECTRON DENSITY AND EFFECTIVE ATOMIC NUMBER, CT SCANNING METHOD, AND INSPECTION METHOD

外国特許コード F180009444
整理番号 (S2016-1200-N0)
掲載日 2018年7月24日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2017JP035026
国際公開番号 WO 2018062308
国際出願日 平成29年9月27日(2017.9.27)
国際公開日 平成30年4月5日(2018.4.5)
優先権データ
  • 特願2016-190218 (2016.9.28) JP
発明の名称 (英語) X-RAY CT DEVICE, METHOD FOR MEASURING ELECTRON DENSITY AND EFFECTIVE ATOMIC NUMBER, CT SCANNING METHOD, AND INSPECTION METHOD
発明の概要(英語) An X-ray CT device is provided with a processing unit for processing data obtained by detecting X-rays radiated from an X-ray light source of a light source unit and transmitted through a measurement object, the processing unit finding an absorption coefficient µ(k) for each energy region k of each calibration tool from data obtained by measuring two or more types of calibration tools in a plurality of energy regions, calculates calibration coefficients F(k), G(k) for the energy regions k on the basis of equation (3) from the absorption coefficient found for each calibration tool, finds an absorption coefficient µ(k) for each energy region k of a measurement object from data obtained by measuring a measurement object in each of a plurality of energy regions, and calculates the electron density ρe and the effective atomic number Z of the measurement object on the basis of equation (4) from the calibration coefficients F(k), G(k) for the energy regions k and the absorption coefficients µ(k) for the energy regions k of the measurement object.
従来技術、競合技術の概要(英語) BACKGROUND ART
In the diagnosis of cancer, is essential for CT inspection. CT information, as well as diagnostic imaging, radiation treatment of cancer in further, the quality of the therapeutic treatment plan to provide the requisite information. The image of the CT, the attenuation of the subject obtained from the magnitude of the CT value is basically configured. In the X-ray treatment planning, the value of the CT-CT value using a conversion table to the electron density is converted into electron density, electron density on the basis of the information, the treatment plan of a heavy X-ray or flagged.
In a heavy particle, when a treatment plan, the following water-equivalent sites ±1%, in an organ such as lungs in an accuracy of less than ±2% so as to obtain the electron density distribution (IPEM81) has been proposed. In addition, X-ray irradiation treatment (orienting the radiation therapy (SRT), radiation therapy (IMRT) intensity modulation) is in, so as to obtain the accuracy of the ±3% electron density has been proposed (Japan radiographic techniques Society, (Kyoto), 2003 year). However, according to research (see Non-Patent Document 1), one or more facility in Japan in 200, the value of the CT-electron density conversion table to the value of the variation is large, the average ±6%, the maximum deviation from the mean value of 25% has been reported in, the quantitative property in the state of the art are not necessarily sufficient.
CT value-the value of electron density conversion table for the variation of the proposed solution, using 2 types of energy of the X-ray CT X-ray color 2 (Dual Source CT), or, using the X-ray CT image of the information has been proposed is Photon Counting CT. Then, Patent Document 1-in Patent Document 11, Photon Counting CT reconstruction of the data to the apparatus configuration of described techniques relating to the program.
In addition, the device described in Patent Document 12 is used, as described in Patent Document 13 using a device and a program, the electron density from the CT value, the effective atomic number for the described method. In addition, by the same inventor (see Non-Patent Document 2) in the scientific literature is, as shown in the embodiment are.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • GUNMA UNIVERSITY
  • 発明者(英語)
  • SAKURAI Hiroshi
  • TORIKOSHI Masami
  • SUNAGUCHI Naoki
  • KANAI Tatsuaki
  • NAGAO Akie
  • LEE Sung Hyun
国際特許分類(IPC)
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