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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.
特許請求の範囲(英語) [claim1]
1. X-ray may include a light source, the plurality of energy region can be irradiated to a subject of measurement line X capable and the light source section, wherein the light source unit from the line light source X irradiated to the object to be measured that has passed through the detection unit and the line X, detected by the detection unit in a processing unit processing data of the line X provided, wherein the processing section, and an effective atomic number homogeneous and is possible to calculate the electron density, of a single element or a compound composed of a 2 calibration jig using one or more types, wherein each of the calibration jig in the energy region of the plurality of detected data from the measured respectively, wherein each of the calibration jig in the energy region of each of the absorption coefficient μ k is obtained, wherein each of the calibration jig in the energy region of each of the absorption coefficient k from μ, based on the following equation (3), in the energy region of each of the correction coefficient (k) in k F, g (k) is calculated, in the equation (3), ρeis shown the electron density of the calibration jig, wherein the calibration jig Z indicates effective atomic number. Further, wherein the processing section, a plurality of the energy region of the object is detected from the data acquired by measuring the, k is the measurement object in the energy region of each of the absorption coefficient μ (k) is obtained, the measurement object in the energy region of each of the absorption coefficient μ k and, in the energy region of each of the correction coefficient (k) in k F, g (k) and, based on the following equation (4), in which the electron density ρ of the measurement objecteand effective atomic number calculating Z in the equation (4), ρeelectron density of the measuring object is, the measured effective atomic number of a target Z shown. X-ray CT apparatus.
[claim2]
2. Wherein the calibration jig and the measurement target is changed, according to claim 1 X-ray CT apparatus having a switching mechanism.
[claim3]
3. Wherein the switching mechanism, wherein the object to be measured and the calibration jig is controlled automatically switch according to claim 2 X ray CT device.
[claim4]
4. X-ray light source of the light source unit, over a region of the plurality of energy beam is irradiated on the continuous spectrum X configuration, wherein the detecting unit detects, for each particular line X energy region configured to detect the discrimination, to any one of claim 1 - claim 3 X 1 line CT device.
[claim5]
5. X-ray CT apparatus, the electronic density and effective atomic number of the measuring object or a method of measuring, homogeneous and effective atomic number and electron density can be calculated, a single element or a compound composed of one or more types of the calibration jig is used to 2, wherein the CT apparatus X lines, wherein each of the calibration jig, each of the plurality of energy region measured, wherein each of the calibration jig in the energy region of each of the absorption coefficient μ k is obtained, wherein each of the calibration jig in the energy region of each of the absorption coefficient k from μ, based on the mathematical formulas (3) shown below, in the energy region of each of the correction coefficient (k) in k F, g (k) is calculated, in the equation (3), ρeelectron density of the calibration jig is shown in, wherein the calibration jig Z indicates effective atomic number. X-ray CT apparatus according, to the measurement object, wherein the plurality of the energy region are measured respectively, k is the measurement object in the energy region of each of the absorption coefficient μ (k) is obtained, the measurement object in the energy region of each of the absorption coefficient μ k and, in the energy region of each of the correction coefficient (k) in k F, g (k) and, based on the following equation (4), in which the electron density ρ of the measurement objecteand effective atomic number calculating Z in the equation (4), ρeelectron density of the measuring object is, the measured effective atomic number of a target Z shown. A method for measuring electron density and effective atomic number.
[claim6]
6. X-ray CT apparatus wherein, from the line light source in the energy region of the plurality X over a continuous spectrum of the measured object is irradiated with the line X, transmitted through the target object in the energy region of each particular X lines configured to detect and discern, according to claim 5 measuring method of the electron density and effective atomic number.
[claim7]
7. X-ray CT apparatus according to claim, wherein the calibration jig is configured to be able to retrieve, according to claim 6 claim 5 or the method of measuring the electron density and effective atomic number.
[claim8]
8. Wherein the calibration jig, carbon, magnesium, aluminum used materials selected from the group consisting of any one of claim 5 - claim 7 1 the method of measuring the electron density and effective atomic number.
[claim9]
9. To carry out the inspection of the human body with respect to the sample under inspection method CT CT, 1 the method according to any one of claim 5 - claim 8 density and effective atomic number measurement methods, wherein the object to be measured as the subject, and wherein said electron density of the subject and the measured effective atomic number, in which the electron density of the subject and the measured effective atomic number and based on the, wherein the electron density map of the interior of a subject CT inspection method.
[claim10]
10. An object with the inspection and, in detecting the presence or absence of explosives object inspection method, of any one of claim 5 - claim 8 1 in the detection method of the electron density and effective atomic number, the object is an object, the object of the measured effective atomic number and density of the electrons, the electron density of the measured object based on the effective atomic number and, in the interior of the object by attempting to specify a material of, wherein the inspection method for detecting the presence of explosives.
  • 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)
指定国 (WO201862308)
National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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