Počet záznamů: 1

CT Artefact Reduction by Signal to Thickness Calibration Function Shaping

  1. 1.
    0365109 - UTAM-F 2012 RIV NL eng J - Článek v odborném periodiku
    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.
    [International workshop on radiation imaging detectors /11./. Praha, 26.06.2009-02.07.2009]
    Grant CEP: GA ČR(CZ) GA103/09/2101
    Grant ostatní: GA MŠk(CZ) LC06041
    Výzkumný záměr: CEZ:AV0Z20710524
    Klíčová slova: flat field correction * digital radiography * signal to thickness function * beam hardnening correction
    Kód oboru RIV: JB - Senzory, čidla, měření a regulace
    Impakt faktor: 1.207, rok: 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.
    Trvalý link: http://hdl.handle.net/11104/0200430