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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 대한자기공명의과학회 Investigative Magnetic Resonance Imaging Investigative Magnetic Resonance Imaging 제22권 제4호
- 발행연도
- 2018.1
- 수록면
- 218 - 228 (11page)
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초록· 키워드
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Purpose: The objective of this study is to determine the effect of physical changes on MR temperature imaging at 7.0T and to examine proton-resonance-frequency related changes of MR phase images and T1 related changes of MR magnitude images, which are obtained for MR thermometry at various magnetic field strengths. Materials and Methods: An MR-compatible capacitive-coupled radio-frequency hyperthermia system was implemented for heating a phantom and swine muscle tissue, which can be used for both 7.0T and 3.0T MRI. To determine the effect of flip angle correction on T1-based MR thermometry, proton resonance frequency, apparent T1, actual flip angle, and T1 images were obtained. For this purpose, three types of imaging sequences are used, namely, T1-weighted fast field echo with variable flip angle method, dual repetition time method, and variable flip angle method with radio-frequency field nonuniformity correction. Results: Signal-to-noise ratio of the proton resonance frequency shift-based temperature images obtained at 7.0T was five-fold higher than that at 3.0T. The T1 value increases with increasing temperature at both 3.0T and 7.0T. However, temperature measurement using apparent T1-based MR thermometry results in bias and error because B1 varies with temperature. After correcting for the effect of B1 changes, our experimental results confirmed that the calculated T1 increases with increasing temperature both at 3.0T and 7.0T. Conclusion: This study suggests that the temperature-induced flip angle variations need to be considered for accurate temperature measurements in T1-based MR thermometry.
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참고문헌 (24)
참고문헌 신청
Lewa CJ / 1980 / Temperature relationships of proton spin-lattice relaxation time T1 in biological tissues / Bull Cancer 67:525~530
Graham SJ / 1998 / Time and temperature dependence of MR parameters during thermal coagulation of ex vivo rabbit muscle / Magn Reson Med 39:198~203
Ishihara Y / 1995 / A precise and fast temperature mapping using water proton chemical shift / Magn Reson Med 34:814~823
Kim JM / 2018 / Monitoring and guidance on high-intensity focused ultrasound treatment by multiple fast field echo at 3.0 T MRI: ex-vivo studies with multiparametric mapping / Proceedings of the 26th Annual Meeting ISMRM :1485
Moseley ME / 1990 / Early detection of regional cerebral ischemia in cats: comparison of diffusion- and T2-weighted MRI and spectroscopy / Magn Reson Med 14:330~346
Graham SJ / 1998 / Time and temperature dependence of MR parameters during thermal coagulation of ex vivo rabbit muscle / Magn Reson Med 39:198~203
Ishihara Y / 1995 / A precise and fast temperature mapping using water proton chemical shift / Magn Reson Med 34:814~823
Kim JM / 2018 / Monitoring and guidance on high-intensity focused ultrasound treatment by multiple fast field echo at 3.0 T MRI: ex-vivo studies with multiparametric mapping / Proceedings of the 26th Annual Meeting ISMRM :1485
Moseley ME / 1990 / Early detection of regional cerebral ischemia in cats: comparison of diffusion- and T2-weighted MRI and spectroscopy / Magn Reson Med 14:330~346
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