Photoacoustic (PA) imaging techniques have recently attracted much attention and can be used for noninvasive imaging of biological tissues. Most PA imaging systems in research laboratories use the time domain method with expensive nanosecond pulsed lasers that are not affordable for most educational laboratories. Using an intensity modulated light source to excite PA signals is an alternative technique, known as the frequency domain method, with a much lower cost. In this paper, we describe a simple frequency domain PA system and demonstrate its imaging capability. The system provides opportunities not only to observe PA signals in tissue phantoms, but also to acquire hands-on skills in PA signal detection. It also provides opportunities to explore the underlying mechanisms of the PA effect.

中文翻译：

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一种经济高效的频域光声成像系统

光声 (PA) 成像技术最近引起了很多关注，可用于生物组织的非侵入性成像。研究实验室中的大多数 PA 成像系统使用时域方法和昂贵的纳秒脉冲激光器，大多数教育实验室都负担不起。使用强度调制光源来激发 PA 信号是一种替代技术，称为频域方法，成本低得多。在本文中，我们描述了一个简单的频域 PA 系统并展示了其成像能力。该系统不仅提供了观察组织体模中 PA 信号的机会，还提供了获得 PA 信号检测实践技能的机会。它还提供了探索 PA 效应潜在机制的机会。