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

• 作者: 刘晓峻 刘良兵 张海涛 李先利 陶超
• 来源期刊: 中国物理B（英文版）
• 关键词: photoacoustic tomography thermoacoustic tomography limited-view pulse decomposition im-age reconstruction
• 年，卷（期）: 2015,（2）
• 页码范围: 024304-1-024304-6
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/2/024304

摘要

Pulse decomposition has been proven to be efficient to analyze the complicated signals and it is introduced into the photoacoustic and thermoacoustic 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.