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Temperature-Range-Dependent Optimization of Noninvasive MR Thermometry Methods

온도범위에 따른 비침습적 자기공명 온도측정방법의 최적화

  • 김종민 (고려대학교 전자 및 정보공학과) ;
  • ;
  • 조영승 (고려대학교 전자 및 정보공학과) ;
  • ;
  • 김정희 (한국기초과학지원연구원) ;
  • 이철현 (한국기초과학지원연구원) ;
  • 오창현 (고려대학교 전자 및 정보공학과)
  • Received : 2015.10.22
  • Accepted : 2015.12.08
  • Published : 2015.12.31

Abstract

Noninvasive temperature monitoring is feasible with Magnetic Resonance Imaging (MRI) based on temperature sensitive MR parameters such as $T_1$ and $T_2$ relaxation times, Proton Resonance Frequency shift (PRFs), diffusion, exchange process, magnetization transfer contrast, chemical exchange saturation transfer, etc. While the temperature monitoring is very useful to guide the thermal treatment such as RF hyperthermia or thermal ablation, the optimization of the MR thermometry method is essential because the range of temperature measurement depends on the choice of the measurement methods. Useful temperature range depends on the purpose of treatment methods, for example, $42^{\circ}C$ to $45^{\circ}C$ for RF hyperthermia and over $50^{\circ}C$ for thermal ablation. In this paper, MR thermometry methods using $T_1$ and $T_2$ relaxation times and PRFs-based MR thermometry are tried on a 3.0 T MRI system and their results are reported and compared. In addition, the scanning protocol and temperature calculation algorithms from $T_1$ and $T_2$ relaxation times and PRFs are optimized for the different temperature ranges for the purpose of RF hyperthermia and/or thermal ablation.

Keywords

References

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