| 基于Radon变换的CT图像杯状伪影校正 |
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| 引用本文： | 张学松,赵柏山.基于Radon变换的CT图像杯状伪影校正[J].CT理论与应用研究,2016(5):539-546. |
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| 作者姓名： | 张学松 赵柏山 |
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| 作者单位： | 沈阳工业大学信息科学与工程学院,沈阳,110870 |
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| 基金项目： | 辽宁省教育厅一般科研项目(L2014053)。 |
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| 摘 要： | 目的:目前的射束硬化校正算法大多需要能谱、检测器特性等信息。针对硬化校正的复杂性,提出一种基于图像后处理的硬化校正方法。方法:首先将带有杯状伪影的水模体CT图像中水的部分分割出来并对其做Radon变换以获取水的投影信息,以此信息构建带有未知系数的校正模型;然后将校正模型与理想图像对比,当它们之间的差异最小时,确定出校正模型的未知系数。利用确定出来的系数和预校正图像软组织的投影信息组合成的校正模型校正实际CT图像,以此消除实际CT图像中的硬化杯状伪影。结果:通过模拟数据验证表明,该方法能去除医用CT中由于射束硬化而引起的杯状伪影。结论:本文提出的方法在不需要能谱信息及投影数据的情况下就能进行杯状伪影的校正,提高了硬化校正的灵活性。
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| 关 键 词： | 射束硬化 校正 CT图像 Radon变换 杯状伪影 |
Cupping Artifacts Calibration in CTImage Based on Radon Transform |
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| ZHANG Xue-song,ZHAO Bai-shan.Cupping Artifacts Calibration in CTImage Based on Radon Transform[J].Computerized Tomography Theory and Applications,2016(5):539-546. |
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| Authors: | ZHANG Xue-song ZHAO Bai-shan |
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| 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. |
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| Keywords: | beam-hardening calibration CT image Radon transform cupping artifacts |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
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