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다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0566618 (1983-12-29) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 306 인용 특허 : 2 |
A method of obtaining an atomic number image of an unknown material. A plurality of calibration materials which have a plurality of different known atomic numbers and densities are scanned with a CAT at first and second energies to determine the attenuation coefficients for the plurality of calibrat
A method of obtaining an atomic number image of an unknown material. A plurality of calibration materials which have a plurality of different known atomic numbers and densities are scanned with a CAT at first and second energies to determine the attenuation coefficients for the plurality of calibration materials at these energies. The energy-dependent coefficients at the first and second energies are determined from the attenuation coefficients for the plurality of calibration materials at the first and second energies according to a predetermined relation. The unknown material is scanned with a CAT at the first and second energies to determine the attenuation coefficients at a plurality of points in a cross section of the unknown material at these energies. The determined energy-dependent coefficients and the determined attenuation coefficients for the unknown material at the first and second energies are used to determine an atomic number image for the unknown material.
A method of obtaining an atomic number image of an unknown material, said method comprising the steps of: scanning a plurality of calibration materials with a computerized axial tomographic scanner (CAT) at a first energy, said plurality of calibration materials having a plurality of different known
A method of obtaining an atomic number image of an unknown material, said method comprising the steps of: scanning a plurality of calibration materials with a computerized axial tomographic scanner (CAT) at a first energy, said plurality of calibration materials having a plurality of different known atomic numbers, Zi, and densities, ri; scanning said plurality of calibration materials with a CAT at a second energy; determining from attenuation coefficients from reconstructed images of said plurality of calibration materials at said first and second energies two energy-dependent coefficients, a and b, at said first and second energies according to the following equation mi=aZmiri+bri where mi: attenuation coefficient for the ith calibration material a: energy-dependent coefficient Zi: atomic number for the ith calibration material m: constant in the range of 3.0-4.0 ri: electron density for the ith calibration material b: energy-dependent coefficient; and scanning said unknown material with a CAT at said first energy; scanning said unknown material with a CAT at said second energy; and using said two determined energy coefficients and attenuation coefficients from reconstructed images for said unknown material at said first and second energies to determine an atomic number image of said unknown material.
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