光学表面成像（OSI）在放疗中的应用与展望

Application and prospect of optical surface imaging technique in radiotherapy

IGRT是目前放射肿瘤学领域最先进的技术。但是,目前最常用的图像引导技术如CBCT、EPID等由于额外辐射、影像质量差、不能实时监控等缺点而受到限制。OSI无额外辐射且能实时监测,经过大量研究评估和验证,其在引导摆位、实时监测放疗分次间和分次内运动、减少CBCT扫描频次以及呼吸门控等方面表现出巨大优势。本文就该类新技术及其在放疗中的应用作一综述和展望。

Currently, image-guided radiation therapy （IGRT） is the most advanced technique in the field of radiation oncology. However, the most commonly used image-guided techniques, such as cone beam computed tomograhpy （CBCT） and electronic portal imaging device （EPID） are limited due to extra radiation, poor image quality and failure of real-time monitoring. Optical surface imaging technique generates no additional radiation and can conduct real-time monitoring. Multiple researches have demonstrated that it has significant advantages in terms of guiding positioning, real-time monitoring of the fractionated and divided motion, reducing the frequency of CBCT scanning, breathing door control, etc. In this paper, this novel technique and its application prospect in radiotherapy are reviewed.