Heat equation inversion framework for average SAR calculation from magnetic resonance thermal imaging

Leeor Alon, Daniel K. Sodickson, Cem M. Deniz

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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.

    Original languageEnglish (US)
    Pages (from-to)493-503
    Number of pages11
    JournalBioelectromagnetics
    Volume37
    Issue number7
    DOIs
    StatePublished - Oct 1 2016

    Keywords

    • MRI
    • dosimetry
    • exposure assessment
    • specific absorption rate
    • temperature mapping

    ASJC Scopus subject areas

    • Biophysics
    • Physiology
    • Radiology Nuclear Medicine and imaging

    Fingerprint

    Dive into the research topics of 'Heat equation inversion framework for average SAR calculation from magnetic resonance thermal imaging'. Together they form a unique fingerprint.

    Cite this