MATLAB PROJECT
Low-Cost
Photoacoustic Tomography System Based on Multi-Channel Delay-Line Module
Abstract:
Photoacoustic tomography (PAT)
combining both optical absorption and ultrasound detection, is a unique and
emerging technology in the field of medical imaging developed in recent years.
PAT is based on the generation and detection of high-frequency pulsed PA
signals. Therefore, a multi-channel data acquisition (DAQ) system with high
sampling rate is crucial to simultaneously receive the multiway PA signals for
real-time imaging. However, the cost of a high-speed multi-channel DAQ is quite
high. In this brief, a multiway PA signal delay-line module for PAT was
proposed, which merges four channels of PA signals in one channel that
significantly reduces DAQ's channel number needed for PAT system. Specifically,
an analog circuit design is proposed to accurately delay four-channel PA
signals and sum them into one channel before digitization, which records both
timing and amplitude of the raw PA signals. Additionally, we reconstruct the
four PA waveforms from the recorded signal for image reconstruction by
delay-and-sum (DAS) algorithm. To verify the feasibility of the delay-line
module in the PAT system, we conducted both simulations and experiments with
promising results.
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