Implementation And Key Algorithm On Portable B-mode Ultrasound Imaging System

Ultrasound imaging technology is widely used in modern medical imaging technology.Most of the medical use device are large cart-based ultrasound diagnostic apparatus currently.Such large-scale equipment using a dedicated computer system,with better computing power,better image processing capability,large storage capacity,various built-in function modules,high diagnostic value.But in the medical community,remote mountainous areas,even under military aid and other special treatment of the environment,there is no condition to use these large-scale medical equipment,which highlights the relevance and importance of the portable ultrasound diagnostic equipment.Under this background,this thesis studies the key algorithms of ultrasound imaging system,aims to improve the resolution of the ultrasound imaging system.In this thesis,the specific research content as follows:(1)This thesis presents a fully digitalized B-imaging system solution,it can greatly reduce the area of the system and power consumption when compared to the traditional analog solution.This system has 16 channels mapping 80 array elements,and it can achieve a higher resolution and detection accuracy when compared to the existing portable imaging system which has 8 channels mapping 32 array elements,so it has a higher value in medical diagnosis.The system uses the AFE + FPGA + PC architecture,and this architecture has high acquisition speed,handling real-time,large storage space and so on.This thesis describes the system hardware and software implementation.Finally,complete the entire system test results.(2)Beamfromming techonolgy as the most important key techonolgy in ultrasound imaging system,it directly impact the image quality.This thesis studies the key techonolgy of ultrasound imaging,focusing on the beamformer detailed inquiry.This thesis compares the various ultrasound imaging techniques and their influence on ultrasound field,using Field II software to the final image contrast.In case of the poor resolution in the near field using the classic beamforming algorithm,this thesis has improved the classic beamforming algorithm.By the sound field and Field II imaging contrast,both of the results were described imaging quality has been improved comparing with the classic beamforming algorithm.(3)This thesis presents a FPGA-based beamformmer circuit implementation.This circuit can be realized in the current dynamic focused ultrasound imaging,dynamic aperture,amplitude apodization algorithm.This circuit with flexible configurability,enables beamforming algorithm in different ways.Finally,complete the simulation waveforms for this circuit.