稀疏射线的透射声波走时层析成像方法研究

Research on Acoustic Wave Traveltime Tomography without Enough Rays

针对常规透射声波层析成像重建算法,在射线稀疏情况下分辨率低以及多解性强等问题,该文提出了一种新的模型描述方法,使待反演的模型描述参数少又能精细描述模型,从而降低了多解性,增强了成像结果的可信性,同时又能保证一定的成像分辨率。为了保证反演的稳定性,该文又提出了相空间的射线追踪方法。试算表明该方法是有效的。

In this thesis an acoustic wave travehime tomography algorithm is proposed. It is developed for solving tomographic multisolution problems without enough rays. The model is described by a new mode. It needs less parameters to describe model, so the results can be more believable. In order to make sure inversion stabili- zation, a ray tracing method is developed. The tests show it is effective.