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

• Published in: Chinese physics B Vol. 24; no. 2; pp. 276 - 281
• Main Author: 刘良兵 陶超 刘晓峻 李先利 张海涛
• Format: Journal Article
• Language: English
• Published: 01.02.2015
• Subjects: Acoustic absorption; Decomposition; Degradation; Errors; Image reconstruction; Imaging; Lobes; Mathematical models; PAT; Reconstruction; TAT; 分解式; 图像质量; 基础; 层析成像; 脉冲幅度; 误差分析
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/24/2/024304

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.