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MRI ??? ??? ??? ??, T1??? T2??? ??
T1? T2? ??? ?? ??? ?? ppt ???????
1. ??
2. ??
3. T1??
4. T2??
5. T1 ??? ??
6. T2 ??? ??????
Magnetic field? Radio Frequency? ???? ??? Hydrogen Nucleus? ??????? ??? ???? ?? ? ????? ??? ??? ?
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Hydrogen Nucleus density
T1 relaxation time
T2 relaxation time
Blood flow
Pulse sequence
Basic Principle
Magnetism
?? ???? ??? ??(´ÅÐÔ)
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Faraday ??? ?? ??
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Space quantization
???? ???? proton? ? ??? ??? ?? parallel ?? anti- parallel? ??? ??
?????? ?? I? ?? ??? ??????? ?
???? ??? 1H, 13C, 31P ?? ?????? ?? ??? ??????
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???? ???? ??? ?? ??? ?? ?? ??? ??? ????? ??? ?? ??? ????? ?? ?????? ?? ???? ?? ?? ?? ??? 70% ?? ??? ???? ?? (???? ??? ? ?? ?? ???) ???? ?? ???, ????, ??, ?? ?? ??? ??? ?? ??? ??? ?? ??? ??? ???? ?? ??
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MRI
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MRI (??????) MRI ?? - ??? ???? ??? ????? ??? ???? ? ? - ???? ???? ?? ??? ?? ?? ???? ???? - ? ???? ??? ???? ???? ?? ???? ??? ?? , ??? ??? ???? ???? ??? ??? 80%? ???? ??? ?? ??? ?? ???? ???? ???.. -
MRI??
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MRI? ???? ? ¡ö ??? ?? ?? ???. ¡ö ????(radio wave)? ???. ¡ö ????? ??. ¡ö ??? ??(signal)? ????, ¡ö ??? ??? ???? ¡ö ??? ??? ???. MRI(Magnetic Resonance Image) ¡ö ??? ??? ???? ????? ?? ?? ???..
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MRI ???? ??
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MRI ? ??? Gadolinium ??? ????? ??? ??? ????? ??? ??? ??? ?? ??? ???? ??? ????? ??? ??? ???? ???????? ??? ???? ??? ??. CT? MRI???? ?? ????? ???? ??? ???? ?? ??? ???? ??? ?? ??? ???. MRI? ?? ?? ????.. -
CT? MRI? ??
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???????? (CT)? ?????? (US), ??????? (MRI)? ?? ??? ??? ??????? ??? ?????? ???? ????? ?? ? ??? ??. 1980?? ???? MRI? ?? ????? ?? CT? ?? ??? ???? ?? ??? 1989? spiral CT?? ?? ??? ???? ???? ??????? ?? CT.. -
[??????] MRI (Magnetic Resonance Imaging)
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MRI?? ??????[M.R.I ( Magnetic Resonance Imaging)]? ???, ??? ?? ??? ?? ?? ?????? X-ray, CT, MRI, ???, ????? ??. ?? MRI? ??? ??? ???? ??? ??? ??? ???? Computer? ??? ?? ?????, ????? ????. MRI? X-ray?..
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