Development of Accurate/Advanced Radiotherapy Treatment Planning and Quality Assurance System (ARTS)

A prototype of accurate/advanced radiotherapy treatment planning and quality assurance system (ARTS) is developed and key technical issues related to the improvement of the treatment accuracy is studied. After a brief introduction to the prototype of ARTS, the advanced development in key technical issues is presented, including image data processing and human body modeling, fast and accurate hybrid dose calculation, multi-objective optimization of inverse planning, intelligent patient positioning, and dose verification.     

智能功率模块的结构与使用

 智能功率模块(IPM)是一种先进的功率开关器件,它是以功率器件IGBT为主同时将驱动电路和欠压保护、过流保护、短路保护、过温保护等多种保护集成在同一模块内。这种高度集成化不但大大缩短产品的研发周期,还能减少其体积、降低噪声干扰、改善驱动和保护性能,同时系统的可靠性也得到了较大的改善。这些优点为其在电力电子领域创造了良好的应用条件,利用IPM的控制功能,与微处理器相结合,可方便地构成智能功率控制系统。IPM应用广泛:如在变频器、直流调速系统、DC-DC变换器以及有源电力滤波器等领域都有着不俗的表现,尤其在电机控制方面的应用受到广泛关注。