A novel method of ultrasound-modulated optical tomography (UOT) detection based on the laser feedback technology is proposed in this Letter. The system has advantages such as a simple structure, high sensitivity, and reflective configuration. Effective penetration depths of up to 9 cm and 5 cm in phantom and biological tissues, respectively, have been demonstrated experimentally. The detection capability is comparable with the state of the art in the transmission mode but with a much lower photon consumption. Although a lot remains to be improved, the proposed method is promising for further development toward practical applications.

中文翻译：

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反射模式下的超声调制激光反馈断层扫描

本文提出了一种基于激光反馈技术的超声调制光学层析成像（UOT）检测新方法。该系统具有结构简单，灵敏度高和反射配置等优点。实验证明，在幻影和生物组织中有效穿透深度分别高达9 cm和5 cm。在传输模式下，其检测能力与现有技术相当，但光子消耗却低得多。尽管有很多地方有待改进，但所提出的方法有望进一步发展为实际应用。