Research On Fast Ultrasonic Imaging Method Based On Non-uniform Array Probe

To satisfy the demand for accurate measurement of some important disease indications in medical clinics,medical ultrafast ultrasound imaging technology develops a lot for its efficient imaging speed.The advancement of relevant research also further improves the requirements for the quality of ultrasound rapid imaging,mainly focusing on the near-field image resolution and the optimization of artifacts brought by imaging algorithm,The fundamental reason lies in the structure of ultrasonic array transducer.To improve the quality of ultrasonic rapid imaging from the root,this paper carries out the following work from the perspective of ultrasonic probe design and its application in imaging:1.An ultrasonic non-uniform array structure distribution model is proposed,which is based on the mature quantitative optimization method in the field of antenna.After modifying the physical position of array elements in the original uniform linear/convex array model,the sound field direction of non-uniform linear array/convex array shows that the sidelobe value has been significantly optimized,and the maximum value of sidelobe has successfully exceeded-13.5 dB.2.Based on the proposed non-uniform linear array structure model and the optimized sound field,the non-uniform linear array is further applied to the coherent plane-wave compounding technology.Through the simulation of spatial sound field distribution,it is verified that the continuity of non-uniform linear array in the near-field has been greatly improved.The subsequent imaging simulation and phantom experiments also show that the non-uniform structure significantly improves the results of coherent plane-wave compounding,especially for the problems of artifacts and resolution in the near-field.3.Aiming at the proposed structural model of the non-uniform convex array,combined with the actual experimental conditions,using the convenient implementation method of transmitting apodization setting of commercial convex array probe,the complex manufacturing process of a convex array is avoided,and a non-uniform convex array transducer is designed and implemented.Through theoretical experiments such as sound field simulation and imaging simulation,as well as phantom imaging experiments,the advantages of non-uniform convex array are verified.Without increasing the complexity of the imaging system,the imaging range is effectively expanded,and the image quality is maintained at the same level as that of uniform convex array.4.Combined with the relevant research of the coherent plane-wave and divergent-wave compound imaging framework,it is unified into a non-focusing wave compound imaging algorithm,and the focusing wave composite imaging algorithm is accelerated by using the powerful GPU algorithm.Build an ultrasonic imaging control platform with high parameter openness,effectively shorten the time of accumulating ultrasonic echo data by using multi-threaded parallel program architecture,and uniformly transplant the above imaging framework suitable for non-uniform structure array distribution,which provides a more convenient verification means for the imaging effect of non-uniform array ultrasonic transducer.