Diagnostic instruments are the tools physicians use to acquire data about the patient. Important parameter is the body temperature, both externally on the skin and in-vivo. Especially during Hyperthermia, the in-vivo body temperature is a parameter that needs continuous monitoring.
Disadvantage of electrical temperature sensors is the fundamental use of electric current, and the sensitivity to RF-sources (e.g. MRI). Fiber Bragg Gratings (FBG) are sensors written in an optical fiber and insensitive to RF-sources. Therefore they are ideally to be used during in-vivo temperature monitoring in RF environment (e.g. Hyperthermia and MRI).