Design and simulation of coil system in thermotherapy

Cancer has become one of the leading causes of death among all disease in the past decades [1]. Thermotherapy (also called hyperthermia) is a new type of cancer treatment in which body tissue is exposed to high temperatures, kills cancer cells, and without significant side-effects. It is a promising approach after surgery, radiotherapy, and chemotherapy [2]. There are several methods to produce heat for cancer treatment, such as microwave, ultrasound, radio-frequency, laser, and electromagnetic [3][4][5]. In recent years, a thermotherapy based on magnetic fluid nanomaterials can be used not only to generate heat, but also to deliver and release drugs in the process of treatment [6]. Hence, magnetic fluid nanomaterials hyperthermia is becoming a promising treatment approach attribute to its unique advantage. According to theory of Brownian relaxation, Neel relaxation, and the experimental result in [7], the specific absorption rate (SAR) is reduced drastically with the increasing of static magnetic field strength which is perpendicular to the alternating field.