A Method for Reconstructing Three-Dimensional Structure of Nasal Cavity Based on a Short-Source Acoustic Tube
Acoustic reflectometry technique is a non-invasive measurement technique for determining the internal dimensions of tubes of different cross-sections,so it has a natural advantage in the direction of medical measurement of nasal structures.However,the long source acoustic tube in this technique is not portable and the high cost con-strains the application of this method in the medical direction.Therefore,this study proposes a short-source acoustic wave tube-based method for 3D structural reconstructing of the nasal cavity to solve these problems.In this study,the difficulty of separating incident and reflected waves in short-source acoustic wave pipelines is solved by analyzing the propagation characteristics of pulsed acoustic waves in short-source acoustic wave pipelines;the method of correcting the DC offset component and introducing constraints to inhibit the high-frequency noise is used to preprocess the na-sal acoustic wave signals;and finally,the 2D curves of the nasal cavity are reshaped by the 3D nasal cavity structural reconstructing method with a layered approach,and the 3D visualization is carried out.The experimental results show that the constraint factor has a large influence on the results of reconstructing the nasal cavity,and the optimal range of values for the constraint factor is determined in this paper.