Hyperthermia Temperature Measure-control Technology And The Application Research

Hyperthermia is a method of treating tumors by heating. The basic principle is to use physical energy heating, make human body or local tumor tissue temperature rises to the effective treatment, and maintain a certain temperature, use normal tissue and cell tumor of temperature difference and tolerance to can make tumor cell apoptosis, and no damage to normal tissues.Hyperthermia following surgery, radiotherapy has become immune therapy, chemotherapy and after the first five therapy, is a new kind of cancer therapy is an effective means. Can effectively kill malignant tumor cell, improve the quality of life of patients, prolong the patient's life, and ease of chemotherapy and radiation effects produced, so called "green therapy".Experiments show that, in 42°C region, 1°C temperature difference can be multiplied changes in cell viability. Thus, hyperthermia can accurate temperature measurement and precise temperature control is crucial to achieve efficacy.This design USES the high precision digital temperature sensor DS18B20 and FPGA realizing temperature measurement and control. DS18B20 consists of a single integrated circuit consisting of single signal digital temperature sensor, the advantage is measured by temperature can be directly into digital signal output. The bridge circuit for voltage analog, amplification and into digital signals frequency-field, avoid the traditional sensor interchangeability, etc. Especially on a multipoint temperature detection, in various errors, reliability and solving system optimization, compared with the traditional temperature sensor DS18B20, has incomparable advantage. Adopted FPGA as controller, because it is pure, so the hardware realization to control temperature and high reliability. Additional, still can make the system is greatly reduced, the number of devices designed to be flexible, field programmable, debugging simple and small size, etc.