Photoacoustic imaging is an emerging biomedical imaging method based on photoacoustic effect. Firstly, a short pulse laser is used to illuminate the object which absorbs part of the light pulse energy and expands adiabatically. Then the initial sound pressure is generated and radiates outward in the form of pressure waves, which is the ultrasonic wave, also called photoacoustic signal. By placing an ultrasonic transducer in advance, the photoacoustic signal can be detected, which enables the optical absorption distribution to be reconstructed with a reconstruction algorithm. However, photoacoustic signal can be easily disturbed by noise in the process of propagation, leading to a defective reconstruction effect of photoacoustic image. Therefore, it is necessary to digitize the photoacoustic signal and explore its spectrum characteristics. This article constructs a visual photoacoustic signal digital processing platform based on GUI. The platform includes three modules: the module of photoacoustic signal generation, the signal analysis module, and the digital filter module. The module of photoacoustic signal generation obtains photoacoustic signals of time series based on k-Wave. The signal analysis module can achieve the analysis of photoacoustic signal both in time domain and frequency domain to determine its characteristics. The digital filter module includes FIR and IIR digital filters with variable boundary frequency and attenuation constant, upon which the filtered loss function diagram and the waveform diagram of signal in time domain depend. The visual photoacoustic signal digital processing platform has the advantages of simple operation and complete functions, which will contribute to the research of photoacoustic imaging.
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