论文信息 - Evaluation of Simplex Codes for Photoacoustic Coded Excitation

Evaluation of Simplex Codes for Photoacoustic Coded Excitation

In biomedical photoacoustics (PA) ultrasound is generated by laser irradiation of tissue. Usually, PA signals are generated by Nd:YAG lasers, but it would be attractive to use less expensive laser diodes instead. Although laser diodes exhibit low pulse energy, the pulse repetition frequency (PRF) of pulsed laser diodes is much higher than the PRF of Nd:YAG lasers thus averaging can be used to increase the SNR. The applied PRF for averaging is limited by the acoustical time-offlight. To further increase the SNR we propose to use coded excitation for pulsed PA imaging. In optical time-domain reflectometry, which is similar to PA imaging, Simplex codes are successfully used for coding. Therefore, we evaluate their performance for photoacoustic coded excitation by a simulation study based on experimental data.

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