Cupping Artifacts Calibration in CTImage Based on Radon Transform
ZHANG Xue-song
ZHAO Bai-shan
Abstract：Objective:At present, most of beam hardening calibrationalgorithms requiredspectrum,the detector characteristics and other information. Asthe beam hardening calibration algorithm’scomplexity,we propose a method based on image post-processing.Methods:Firstly, the waterportionwith cupping artifacts is segmentedin the waterphantomCT imageand doneRadon transform to obtain projection information.The calibration model with unknowncoefficientsis builtwith aboveprojectioninformation. Secondly,an ideal water phantom image without beam hardening artifacts is constructed and compared with calibration model. When the difference between them is minimal, the unknown coefficientsof correction model is determined.Finally,use the calibration model that combinedthe determined parameterandthe projection information of segmented soft tissue to correct thepracticalCT imagesso thateliminate the cupping artifacts.Results:The result of computer simulation shows thatthismethodcan efficiently remove the cupping beam hardening due to a medical CT beam-hardening caused. Conclusion:The proposed methodwithoutneed forprojection dataand spectrum information can becarriedout in beam hardening cupping artifacts calibration,improvedbeam hardening correction flexibility.
Keywords：beam-hardeningcalibrationCT imageRadon transformcupping artifacts
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 539-546 )