Low dose CT image enhancement based on second generation Curvelet transform

doi:10.3778/j.issn.1002-8331.2010.06.056

Computer Engineering and Applications ›› 2010, Vol. 46 ›› Issue (6): 191-193.DOI: 10.3778/j.issn.1002-8331.2010.06.056

• 图形、图像、模式识别 • Previous Articles Next Articles

Low dose CT image enhancement based on second generation Curvelet transform

ZHANG Tao¹，WANG Bin¹，YANG Li-juan²，QI Nai-xin³

1.Information College，Northwest University，Xi’an 710069，China
2.CT Department，Xi’an 4th Hospital，Xi’an 710004，China
3.CT Department，the Second Hospital of Xi’an Jiaotong University，Xi’an 710004，China

Received:2008-11-20 Revised:2009-02-13 Online:2010-02-21 Published:2010-02-21
Contact: ZHANG Tao

第二代Curvelet变换在低剂量CT图像增强中的应用

张涛¹，王宾¹，杨立娟²，齐乃新³

1.西北大学信息学院，西安 710069
2.西安市第四医院 CT室，西安 710004
3.西安交通大学医学院第二附属医院 CT室，西安 710004

通讯作者: 张涛

Abstract

Abstract: Low dose CT has low Signal-Noise Ratio（SNR） and bad contrast.The second generation Curvelet transform is used to enhanced low dose CT images of infant brain.Firstly，the CT source images are decomposed by Curvelet transform.Then nonlinear enhancing function is applied to enhance the image’s global contrast in the low frequency sub-band，and threshold denoising method is combined with non-linear gain method，it can reduce the noise and enhance the details of image at each scale in the high frequency sub-band.Compared with wavelet and histogram equalization，enhanced images based on the second generation Curvelet transform show that image SNR and contrast are increased，image edges are preserved.It has a good visual effect.

Key words: Curvelet transform, images enhanced, low dose CT

摘要： 低剂量CT图像信噪比低，图像对比度差。对婴幼儿低剂量颅脑CT图像应用第二代Curvelet变换，分别对低频子带进行非线性增强、对高频子带应用自适应域值方法进行去噪后再进行非线性增强，再经Cuverlet反变换后，其结果与小波变换增强及直方图均衡增强的结果进行比较。结果显示第二代Curvelet变换增强图像对比度及信噪比明显提高，图像细节显示清晰，效果良好。

关键词: Curvelet变换, 图像增强, 低剂量CT

CLC Number:

TP393

ZHANG Tao¹，WANG Bin¹，YANG Li-juan²，QI Nai-xin³. Low dose CT image enhancement based on second generation Curvelet transform[J]. Computer Engineering and Applications, 2010, 46(6): 191-193.

张涛¹，王宾¹，杨立娟²，齐乃新³. 第二代Curvelet变换在低剂量CT图像增强中的应用[J]. 计算机工程与应用, 2010, 46(6): 191-193.

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Low dose CT image enhancement based on second generation Curvelet transform

第二代Curvelet变换在低剂量CT图像增强中的应用

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