Pulse decomposition-based analysis of PAT/TAT error caused by negative lobes in limited-view conditions

Pulse decomposition-based analysis of PAT/TAT error caused by negative lobes in limited-view conditions
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基于脉冲分解的有限视野条件下负瓣引起的 PAT/TAT 误差分析

DOI:
10.1088/1674-1056/24/2/024304
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发表时间:
2015-02
期刊:
影响因子:
1.7
通讯作者:
Zhang Hai-Tao
Zhang Hai-Tao
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Tao Chao;Liu Xiao-Jun;Li Xian-Li;Zhang Hai-Tao

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脉冲分解已被证明是分析复杂信号的有效方法,并将其引入光声和热声层析成像中,以消除由负瓣引起的重建失真。在图像重建过程中,负瓣会给声脉冲幅度的估计带来误差,这与吸收系数的分布密切相关。在有限视场条件下,由于负瓣误差不能像在全视场条件下那样得到很好的补偿,所以它严重降低了成像质量。为此,给出了消除负瓣误差的脉冲分解公式,并将其融入到目前流行的延迟求和法中,以求在不增加复杂计算的情况下更好地重建图像。数值实验表明,在有限视场条件下,脉冲分解明显改善了图像质量,如分离相邻的吸收峰、在附近的大吸收体扰动下发现一个小的吸收峰等。
Pulse decomposition has been proven to be efficient to analyze complicated signals and it is introduced into the photo-acoustic and thermo-acoustic tomography to eliminate reconstruction distortions caused by negative lobes. During image reconstruction, negative lobes bring errors in the estimation of acoustic pulse amplitude, which is closely related to the distribution of absorption coefficient. The negative lobe error degrades imaging quality seriously in limited-view conditions because it cannot be offset so well as in full-view conditions. Therefore, a pulse decomposition formula is provided with detailed deduction to eliminate the negative lobe error and is incorporated into the popular delay-and-sum method for better reconstructing the image without additional complicated computation. Numerical experiments show that the pulse decomposition improves the image quality obviously in the limited-view conditions, such as separating adjacent absorbers, discovering a small absorber despite disturbance from a big absorber nearby, etc.
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发表时间: 2000-02
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