›› 2015, Vol. 24 ›› Issue (2): 24304-024304.doi: 10.1088/1674-1056/24/2/024304
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
刘良兵a b, 陶超a, 刘晓峻a, 李先利b, 张海涛b
Liu Liang-Bing (刘良兵)a b, Tao Chao (陶超)a, Liu Xiao-Jun (刘晓峻)a, Li Xian-Li (李先利)b, Zhang Hai-Tao (张海涛)b
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.
中图分类号: (Acoustic signal processing)