DK1970731T3 - Fremgangsmåde til kalibrering af et computertomografisystem med dobbelt-energi og fremgangsmåde til billedrekonstruktion - Google Patents

Fremgangsmåde til kalibrering af et computertomografisystem med dobbelt-energi og fremgangsmåde til billedrekonstruktion Download PDF

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Publication number
DK1970731T3
DK1970731T3 DK08250858.1T DK08250858T DK1970731T3 DK 1970731 T3 DK1970731 T3 DK 1970731T3 DK 08250858 T DK08250858 T DK 08250858T DK 1970731 T3 DK1970731 T3 DK 1970731T3
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DK
Denmark
Prior art keywords
energy
image
projection values
dual
thickness
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DK08250858.1T
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English (en)
Inventor
Li Zhang
Zhiqiang Chen
Guowei Zhang
Jianping Cheng
Yuanjing Li
Yinong Liu
Yuxiang Xing
Ziran Zhao
Yongshun Xiao
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Univ Tsinghua
Nuctech Co Ltd
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Publication of DK1970731T3 publication Critical patent/DK1970731T3/da

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T7/00—Details of radiation-measuring instruments
    • G01T7/005—Details of radiation-measuring instruments calibration techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G01T1/161—Applications in the field of nuclear medicine, e.g. in vivo counting
    • G01T1/164—Scintigraphy
    • G01T1/1641—Static instruments for imaging the distribution of radioactivity in one or two dimensions using one or several scintillating elements; Radio-isotope cameras
    • G01T1/1648—Ancillary equipment for scintillation cameras, e.g. reference markers, devices for removing motion artifacts, calibration devices

Claims (5)

1. Fremgangsmåde til billedrekonstruktion af computerstyret tomografi af basismaterialedekomposition med dobbelt-energi, idet fremgangsmåden omfatter trinnene: at scanne en genstand under inspektion med dobbelt-energistråler for at opnå dobbelt-energi projektionsværdier;at beregne projektionsværdier af koefficienter af basismaterialer (Bi, B2) svarende til dobbelt-energi projektionsværdierne baseret på en præ-dannet opslagstabel der indikerer korrespondance mellem forskellige kombinationer af tykkelse og projektionsværdier af koefficienter af basismaterialer (Bi, B2); at rekonstruere et billede af basismaterialekoefficientfordeling (bi, b2) baseret på projektionsværdierne af koefficienter af basismaterialer (Bi, B2), hvor den præ-dannede opslagstabel dannes ved at vælge mindst to basismaterialer, der påviser gennemtrængende stråler fra dobbelt-energi stråler der trænger igennem basismaterialerne under forskellige kombinationer af tykkelse (di, 02) for at opnå projektionsværdier (pi, P2)·, og at danne den præ-dannede opslagstabel i form af korrespondance mellem de forskellige kombinationer af tykkelse (di, d2) og projektionsværdierne (pi, P2), hvorved når projektionsværdierne (pi, P2) er lig med dobbelt-energi projektionsværdierne, er en tilsvarende kombination af tykkelse (di, d2) lig med projektionsværdierne af koefficienter af basismaterialer (Bi, B2), hvor dobbelt-energi strålerne omfatter stråler med lav-energi og højenergi, og strålerne med lav-energi og høj-energi er røntgenstråler.
2. Fremgangsmåde til billedrekonstruktion ifølge krav 1, endvidere omfattende et trin til beregning af atomnummerbilledet af genstanden baseret på billedet af forskellig materialekoefficientfordeling.
3. Fremgangsmåde til billedrekonstruktion ifølge krav 1, endvidere omfattende trin til beregning af det karakteristiske densitetsbillede af genstanden baseret på billedet af forskellig materialekoefficientfordeling.
4. Fremgangsmåde til billedrekonstruktion ifølge krav 1, endvidere omfattende trin til beregning af attenuationskoefficientbilledet af genstanden baseret på billedet af forskellig materialekoefficientfordeling.
5. Fremgangsmåde ifølge krav 1, hvor de forskellige materialer omfatter kulstof og aluminium.
DK08250858.1T 2007-03-14 2008-03-14 Fremgangsmåde til kalibrering af et computertomografisystem med dobbelt-energi og fremgangsmåde til billedrekonstruktion DK1970731T3 (da)

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CNA2007100643913A CN101266216A (zh) 2007-03-14 2007-03-14 标定双能ct系统的方法和图像重建方法

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US (1) US7881424B2 (da)
EP (1) EP1970731B1 (da)
CN (1) CN101266216A (da)
DK (1) DK1970731T3 (da)
ES (1) ES2626227T3 (da)
PL (1) PL1970731T3 (da)

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Publication number Publication date
EP1970731B1 (en) 2017-03-01
US20080310598A1 (en) 2008-12-18
PL1970731T3 (pl) 2017-09-29
US7881424B2 (en) 2011-02-01
EP1970731A2 (en) 2008-09-17
CN101266216A (zh) 2008-09-17
EP1970731A3 (en) 2013-01-02
ES2626227T3 (es) 2017-07-24

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