Heat equation inversion framework for average SAR calculation from magnetic resonance thermal imaging
| Autor: | Daniel K. Sodickson, Cem M. Deniz, Leeor Alon |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Physiology Biophysics Specific absorption rate 020206 networking & telecommunications 02 engineering and technology General Medicine Thermal conduction Imaging phantom 030218 nuclear medicine & medical imaging law.invention Computational physics 03 medical and health sciences 0302 clinical medicine Nuclear magnetic resonance Magnetic Resonance Thermal Imaging law Electric field 0202 electrical engineering electronic engineering information engineering Radiology Nuclear Medicine and imaging Heat equation Dipole antenna Bioelectromagnetics |
| Zdroj: | Bioelectromagnetics. 37:493-503 |
| ISSN: | 0197-8462 |
| DOI: | 10.1002/bem.21996 |
| Popis: | Deposition of radiofrequency (RF) energy can be quantified via electric field or temperature change measurements. Magnetic resonance imaging has been used as a tool to measure three dimensional small temperature changes associated with RF radiation exposure. When duration of RF exposure is long, conversion from temperature change to specific absorption rate (SAR) is nontrivial due to prominent heat-diffusion and conduction effects. In this work, we demonstrated a method for calculation of SAR via an inversion of the heat equation including heat-diffusion and conduction effects. This method utilizes high-resolution three dimensional magnetic resonance temperature images and measured thermal properties of the phantom to achieve accurate calculation of SAR. Accuracy of the proposed method was analyzed with respect to operating frequency of a dipole antenna and parameters used in heat equation inversion. Bioelectromagnetics. 37:493-503, 2016. © 2016 Wiley Periodicals, Inc. |
| Databáze: | OpenAIRE |
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