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

被引:3
作者
Liu Liang-Bing [1 ,2 ]
Tao Chao [1 ]
Liu Xiao-Jun [1 ]
Li Xian-Li [2 ]
Zhang Hai-Tao [2 ]
机构
[1] Nanjing Univ, Key Lab Modern Acoust, Nanjing 210093, Jiangsu, Peoples R China
[2] Logist Engn Univ, Chongqing 401311, Peoples R China
基金
中国国家自然科学基金;
关键词
photo-acoustic tomography; thermo-acoustic tomography; limited-view; pulse decomposition; image reconstruction; PHOTOACOUSTIC IMAGE-RECONSTRUCTION; TOMOGRAPHY; ALGORITHM; TRANSFORM; BRAIN;
D O I
10.1088/1674-1056/24/2/024304
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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.
引用
收藏
页数:6
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