Gated Therapy
Treatment to tumors located in the thoracic and abdominal regions, such as lung and liver, is always a challenging task because of respiratory organ motions. Traditional approach is to expand each treatment field to ensure the entire tumor volume is included in the radiation filed. To minimize radiation damage to extra normal tissues due field expansion, Duke has adopted respiratory control techniques to synchronize the radiation beam with tumor motion. With this technique, the treatment margin added to accommodate the organ motion could be reduced to minimize the radiation dose to normal tissues. Advanced technologies are used to achieve this goal, such as the use of Varian RPM system to monitor respiratory pattern, On-Board Imager to verify target motion, and electronic portal imaging system to verify real-time radiation delivery.