Computation of temperature elevation in rabbit eye irradiated by 2.45-GHz microwaves with different field configurations.
This study calculated the temperature elevation in the rabbit eye caused by 2.45-GHz near-field exposure systems. First, we calculated specific absorption rate distributions in the eye for different antennas and then compared them with those observed in previous studies. Next, we re-examined the temperature elevation in the rabbit eye due to a horizontally-polarized dipole antenna with a C-shaped director, which was used in a previous study. For our computational results, we found that decisive factors of the SAR distribution in the rabbit eye were the polarization of the electromagnetic wave and antenna aperture. Next, we quantified the eye average specific absorption rate as 67 W kg(-1) for the dipole antenna with an input power density at the eye surface of 150 mW cm(-2), which was specified in the previous work as the minimum cataractogenic power density. The effect of administrating anesthesia on the temperature elevation was 30% or so in the above case. Additionally, the position where maximum temperature in the lens appears is discussed due to different 2.45-GHz microwave systems. That position was found to appear around the posterior of the lens regardless of the exposure condition, which indicates that the original temperature distribution in the eye was the dominant factor.
Hirata
Akimasa
A
Department of Computer Science and Engineering, Nagoya Institute of Technology, Japan. ahirata@nitech.ac.jp
Watanabe
Soichi
S
Taki
Masao
M
Fujiwara
Osamu
O
Kojima
Masami
M
Sasaki
Kazuyuki
K
D000818:Animals; D004307:Dose-Response Relationship, Radiation; D004781:Environmental Exposure; D005123:Eye / Q000528:radiation effects*; D008872:Microwaves; D019047:Phantoms, Imaging; D011817:Rabbits; D013696:Temperature