Gu Changzhan, Li Ruijiang, Jiang Steve B, Li Changzhi
Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.
Annu Int Conf IEEE Eng Med Biol Soc. 2011;2011:417-20. doi: 10.1109/IEMBS.2011.6090054.
Respiratory gating and tumor tracking are two promising motion-adaptive lung cancer treatments, minimizing incidence and severity of normal tissues and precisely delivering radiation dose to the tumor. Accurate respiration measurement is important in respiratory-gated radiotherapy. Conventional gating techniques are either invasive to the body or bring insufficient accuracy and discomfort to the patients. In this paper, we present an accurate noncontact means of measuring respiration for the use in gated lung cancer radiotherapy. We also present an accurate tumor tracking technique for dynamical beam tracking radiotherapy. Two 2.4 GHz miniature radars were used to monitor the chest wall and abdominal movements simultaneously to get high resolution and enhanced parameter identification. Ray tracing technique was used to investigate the impact of antenna size in clinical practice. It is shown that our multiple radar system can reliably measure respiration signals for respiratory gating and accurate tumor tracking in motion-adaptive lung cancer radiotherapy.
呼吸门控和肿瘤追踪是两种很有前景的运动自适应肺癌治疗方法，可将正常组织的发生率和严重程度降至最低，并将辐射剂量精确地输送到肿瘤部位。准确的呼吸测量在呼吸门控放疗中很重要。传统的门控技术要么对身体有侵入性，要么给患者带来精度不足和不适。在本文中，我们提出了一种用于门控肺癌放疗的准确的非接触式呼吸测量方法。我们还提出了一种用于动态束流追踪放疗的准确的肿瘤追踪技术。使用两个2.4 GHz微型雷达同时监测胸壁和腹部运动，以获得高分辨率和增强的参数识别。使用射线追踪技术研究天线尺寸在临床实践中的影响。结果表明，我们的多雷达系统能够可靠地测量呼吸信号，用于运动自适应肺癌放疗中的呼吸门控和准确的肿瘤追踪。
