一种基于空气扫描的锥束CT环形伪影校正方法

基金项目:

西北工业大学基础研究基金(JC20110253)

国家自然科学基金(51105315)

国家科技重大专项(2012ZX04007021-003)

详细信息

Ring Artifact Correction Method Based on Air Scan for Cone-beam CT

1. School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an, 710072, China;
2. Key Lab of Contemporary Design and Integrated Manufacturing Technology(Northwestern Polytechnical University), Ministry of Education, Xi'an, 710072, China

摘要: 在分析锥束CT平板探测器校正方法及环形伪影残留原因的基础上,提出一种简便的基于空气扫描的锥束CT环形伪影校正方法。该方法首先在同一锥束CT系统中采用相同参数进行空气扫描和被测物体扫描,然后分别重建出系列切片图像,最后由被测物体切片图像与空气切片图像对应相减实现残留环形伪影的校正,同时起到一定的降噪作用。实验结果验证了该方法的可行性和有效性。
- 锥束CT /
- 平板探测器 /
- 环形伪影 /
- 空气扫描
Abstract: On the basis of analysis of flat panel detector correction methods and the residual causes of ring artifacts in cone-beam CT (CBCT), a simple correction method for CBCT ring artifacts based on air scan is proposed.Firstly, an air scan and measured object scan are performed using the same parameters in the same CBCT system.And then a series of slice images are reconstructed, respectively.Finally, the air slice images are subtracted from the corresponding slice images of the measured object to achieve the correction of the residual ring artifacts, at the same time playing a certain role in noise reduction.Experimental results demonstrate the feasibility and effectiveness of this method.
- cone-beam CT (CBCT) /
- flat panel detector /
- ring artifact /
- air scan

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2. Key Lab of Contemporary Design and Integrated Manufacturing Technology(Northwestern Polytechnical University), Ministry of Education, Xi'an, 710072, China