Apparatus for 'in vivo' exposure at 1.8 GHz microwaves.

摘要

In a previous study, an apparatus generating 1.8 GHz electromagnetic radiation for “in vivo” biomedical study was designed and implemented. The apparatus consisted of a reverberation\udchamber and it reproduced a habitat similar to the usual one for the laboratory animals. Plexiglas\udboxes with 300 cc physiological liquid were utilized as simple phantoms. For the measurements a small Electric Field Probe was used. The maximum SAR (Specific Absorption Rate) and average\udPower Efficiency Pe (SAR/input power) values obtained were quite low (“in vivo experiments”) and this was the drawback of the apparatus. In the present work, different modifications introduced in\udorder to increase SAR and Power Efficiency are presented. In the new configuration, the dosimetry\udfor the previous phantoms and for oil-in-gelatine phantoms was investigated and quite satisfactory SAR and Power Efficiency values were obtained, overcoming the previous drawback. In the\udfirst case the sensor was waterproofed, as in the previous study; in the other case a Plexiglas box\udwith inside a tight shaped allocation for the measurement probe was realized. These measurement technologies could be applied to other media used for the phantoms.