| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
Technical descriptions of experimental heating test for MRI safety of implantable medical device is based on fiber-optic thermometry. However, they are not temperature imaging procedures and thus insufficient for detecting unexpected hotspot generated in the body. Therefor, we worked on the development of MRI techniques to image temperature distribution around some IMD without significant artifact and yet with sufficient temperature sensitivity. We have compared the echo-shifted spin echo technique for proton resonance frequency shift and the multiple flip angle gradient echo technique for spin lattice relaxation time (T1). In the results the image artifact in the echo-shifted spin echo technique was not significantly smaller than the conventional gradient echo technique. Although the multiple flip angle technique with compensation for spatial inhomogeneity of flip angle exhibited absolute temperature images, the compensation is not stable enough to detect temperature accurately.
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