Temperature elevation in the eye of anatomically based human head models for plane-wave exposures
| Autor: | Masami Kojima, Akimasa Hirata, Osamu Fujiwara, K. Sasaki, Toshiyuki Shiozawa, Soichi Watanabe |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Male
Models Anatomic Materials science Hot Temperature Plane wave Radiation Radiation Dosage Electromagnetic radiation law.invention Body Temperature Optics law Humans Radiology Nuclear Medicine and imaging Computer Simulation Tissue Distribution Penetration depth Radiometry Radiological and Ultrasound Technology Human head business.industry Phantoms Imaging Temperature Lens (optics) Female business Head Software |
| Zdroj: | Physics in medicine and biology. 52(21):6389-6399 |
| ISSN: | 0031-9155 |
| Popis: | This study investigated the temperature elevation in the eye of anatomically based human head models for plane-wave exposures. The finite-difference time-domain method is used for analyzing electromagnetic absorption and temperature elevation. The eyes in the anatomic models have average dimensions and weight. Computational results show that the ratio of maximum temperature in the lens to the eye-average SAR (named 'heating factor for the lens') is almost uniform (0.112-0.147 degrees C kg W(-1)) in the frequency region below 3 GHz. Above 3 GHz, this ratio increases gradually with an increase of frequency, which is attributed to the penetration depth of an electromagnetic wave. Particular attention is paid to the difference in the heating factor for the lens between this study and earlier works. Considering causes clarified in this study, compensated heating factors in all these studies are found to be in good agreement. |
| Databáze: | OpenAIRE |
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