CT Artefact Reduction by Signal to Thickness Calibration Function Shaping

0365109 - ÚTAM 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. E-ISSN 1872-9576.
[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
Program: LC
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