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CT Artefact Reduction by Signal to Thickness Calibration Function Shaping

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    0365109 - ÚTAM 2012 RIV NL eng J - Journal Article
    Vavřík, Daniel
    CT Artefact Reduction by Signal to Thickness Calibration Function Shaping.
    Nuclear Instruments & Methods in Physics Research Section A. Roč. 633, č. 1 (2011), s. 177-180. ISSN 0168-9002. E-ISSN 1872-9576.
    [International workshop on radiation imaging detectors /11./. Praha, 26.06.2009-02.07.2009]
    R&D Projects: GA ČR(CZ) GA103/09/2101
    Grant - others:GA MŠk(CZ) LC06041
    Program: LC
    Institutional research plan: CEZ:AV0Z20710524
    Keywords : flat field correction * digital radiography * signal to thickness function * beam hardnening correction
    Subject RIV: JB - Sensors, Measurment, Regulation
    Impact factor: 1.207, year: 2011
    http://dx.doi.org/10.1016/j.nima.2010.06.160

    It is frequently a task to calibrate the radiogram intensity in reference to the object thickness/density value. This knowledge is important when the radiographic densitometry, thickness measurements or precise computed tomography are required. Often aluminum is used as calibrating material and processed radiogram of the real object is evaluated as aluminum equivalent. This approach is qualitatively convenient for transmission radiograms; however, certain secondary artifacts remain in CT reconstructions. Fortunately the calibration function can be shaped using only one or two known thickness values of the object investigated. The shaped calibration function obtained produces the right signal to thickness relationship and CT quality is improved when it is applied.
    Permanent Link: http://hdl.handle.net/11104/0200430

     
     
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