2016年 · 第25卷第09期

Position fixation in precise radiotherapy such as IMRT and 3DCRT is an extremely important link in the design and execution of treatment plan. Thermoplastic body membrane position fixation is one of the commonly used position fixation techniques. The position fixation frame used is divided into slide type and plug type according to the locking mode. The former toggles the sliding buckle to open and close the lock, which is laborious and vulnerable; The latter is convenient and durable, but it is not as repeatable as the former^[1]。 In order to maximize the strengths and avoid the weaknesses, the improvement research on the design that affects the repeatability of the latter is carried out.

Most elderly patients with esophageal cancer are in the middle and late stage when clinically diagnosed, and they are often complicated with a variety of medical diseases. Most of them can't operate or refuse to operate, and they can't afford chemotherapy. Therefore, radiotherapy has become the best choice for elderly patients with esophageal cancer. In recent years, with the continuous development of radiotherapy technology, advanced technologies such as VMAT have appeared, which have made the dose conformity of the target area higher, the distribution more accurate, and the surrounding normal tissues have been better protected, so that side effects and sequelae are significantly reduced. However, the small positioning error of VMRT plan can lead to insufficient target area and increased dose of surrounding tissue. Elderly patients are affected by their own characteristics (such as poor nutritional status, poor communication ability, poor self-care ability, poor control ability, loose skin and thin subcutaneous fat), so the positioning repeatability during radiotherapy is poor. Therefore, it is particularly important to choose suitable fixation device and reasonable PTV expansion boundary. CBCT was used to analyze the position fixation technique and the external discharge distance of CTV-PTV in the target area of elderly patients with esophageal cancer.

The 8th Shanghai International Conference on Radiation Oncology (SICRO) was successfully held in Shanghai on August 13, 2016. The conference was hosted by Cancer Hospital affiliated to Fudan University and undertaken by Shanghai Anti-Cancer Association. The SICRO conference has been successfully held for seven times since it was launched in 1987. In order to adapt to the current development of radiotherapy specialization, it will be held every year from this year, in the form of a thematic conference.

On July 28-30, 2016, the 5th Eastern Cancer Radiotherapy Collaborative Group (EROG) meeting and the "2nd Symposium on the Progress of Radiotherapy and Comprehensive Treatment of Chest Tumors", sponsored by the Eastern Cancer Radiotherapy Collaborative Group (EROG) and jointly organized by the Chest Hospital affiliated to Shanghai Jiaotong University, Renji Hospital affiliated to Shanghai Jiaotong University School of Medicine and the Chest Cancer Professional Committee of Shanghai Anti-Cancer Association, were successfully held in Shanghai. Professor Fu Xiaolong, an authoritative expert in chest tumor radiotherapy in our hospital and deputy director of Radiation Oncology Branch of Chinese Medical Association, served as the chairman of the conference. Hundreds of speakers gave wonderful academic reports and discussions, and nearly 400 experts and scholars from all over the country attended the conference.