대구가톨릭대학병원 영상의학과 이 영 환 M M R R Basic Physics. MR Signal T1-,...
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Transcript of 대구가톨릭대학병원 영상의학과 이 영 환 M M R R Basic Physics. MR Signal T1-,...
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대구가톨릭대학병원 영상의학과이 영 환이 영 환
MMRRBasic PhysicsBasic Physics
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MR SignalMR Signal
T1-, T2-weightedT1-, T2-weighted
TR, TETR, TE
MR SignalMR Signal
T1-, T2-weightedT1-, T2-weighted
TR, TETR, TE
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Radiography, CTRadiography, CT
X-ray
Penetration
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UltrasonographyUltrasonography
Ultrasound
Reflection
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MRIMRI?RF Pulse
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H1
1
RF Pulse
Resonance
Surface Coil
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N
S
++
H1
1
Magnetic DipoleMagnetic Dipole
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N
S
MagnetizationMagnetization
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Magnetic Strength
GaussTesla1 Tesla = 10,000 Gauss
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N
S
PrecessionPrecession
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PrecessionPrecessionN
S
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Resonance
Precession frequencyLarmor frequency
BB00 BB00
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Frequency(MHz)
10-4
102
108
1014
1020
RadioVisible
light
X-raysGamma rays
Cosmic rays
MRMR
Electromagnetic WaveElectromagnetic Wave
Microwave
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Surface Coil
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N
S
N
S
Z
Y
X
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N
S
N
S
Z
Y
X
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N
S
N
S
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Z
Y
X
N
S
Y
X
Z
N
S
LongitudinalMagnetization
TransverseMagnetization
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Z
Y
X
N
S
Y
X
Z
N
S
LongitudinalMagnetization
TransverseMagnetization
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Effect of RF Pulse
Loss of longitudinal M.Creation of transverse M.
– In Phase
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Z
Y
X
Y
X
Z
MR SignalMR Signal
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MR SignalMR Signal
T1-, T2-weightedT1-, T2-weighted
TR, TETR, TE
MR SignalMR Signal
T1-, T2-weightedT1-, T2-weighted
TR, TETR, TE
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Resonance
E2
E1
; Induction of transition between two energy states
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N
S
N
S
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N
S
N
S
RelaxationRelaxation
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Y
X
Z
Y
X
Z
RelaxationRelaxation
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Relaxation
T1 Relaxation T2 Relaxation
; Process determining return to equilibrium of both longitudinal & transverse magnetization
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T1 RelaxationT1 Relaxation
N
S
N
S
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N
S
N
S
Z
Y
X
T1 RelaxationT1 Relaxation
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T1 RelaxationT1 RelaxationLongitudinal
Magnetization
Time
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N
S
T2 RelaxationT2 RelaxationN
S
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BB00
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Transversemagnetization
T2 RelaxationT2 Relaxation
Time
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N
S
N
S
RelaxationRelaxation
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Y
X
Z
Y
X
Z
RelaxationRelaxation
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Transversemagnetization
T2 RelaxationT2 Relaxation
Time
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Transversemagnetization
T2 RelaxationT2 Relaxation
Time
TE
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T2 ContrastT2 Contrast
Time
Short T2 TissueLong T2 Tissue
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T2-weightedT2-weighted
Time
Short T2 TissueLong T2 Tissue
Long TE
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TE ; 28 msec TE ; 90 msec TE ; 230 msec
TR ; 3000 msec
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Spatial LocalizationSpatial Localization
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TE
TR
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T1 RelaxationT1 RelaxationLongitudinal
Magnetization
Time
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T1 ContrastT1 Contrast
Time
Short T1 Tissue
Long T1 Tissue
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T1-weightedT1-weighted
Time
Short T1 Tissue
Long T1 Tissue
Short TR
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TR ; 150 msec TR ; 500 msec TR ; 1500 msec
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120 - 60
40 - 10
300 - 800 1500 - 4000TR (msec)
TE (msec)
Spin EchoSpin Echo
Poor contrastPoor S/N
Poor contrastPoor S/N T2
?T1
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TR 3000 msec, TR 28 msec
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120 - 60
40 - 10
300 - 800 1500 - 4000TR (msec)
TE (msec)
Spin EchoSpin Echo
Poor contrastPoor S/N
Poor contrastPoor S/N T2
ProtonT1 ?
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Normal Tissue
Proton DensityT1T2
Lesion
Proton DensityT1T2
Normal Tissue
LesionLesion
IntrinsicIntrinsicTissueTissue
ContrastContrast
TRTRTETE
NEXNEXMatrixMatrixFOVFOV
Slice ThicknessSlice ThicknessMagnetic StrengthMagnetic Strength
Pulse SequencePulse Sequence........
TRTRTETE
NEXNEXMatrixMatrixFOVFOV
Slice ThicknessSlice ThicknessMagnetic StrengthMagnetic Strength
Pulse SequencePulse Sequence........
ExtrinsicExtrinsicImagingImaging
ParametersParametersImageImage
ContrastContrast
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MR SignalMR Signal
T1-, T2-weightedT1-, T2-weighted
TR, TETR, TE
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![Page 56: 대구가톨릭대학병원 영상의학과 이 영 환 M M R R Basic Physics. MR Signal T1-, T2-weighted TR, TE MR Signal T1-, T2-weighted TR, TE.](https://reader030.fdocument.pub/reader030/viewer/2022032600/56649db15503460f94aa047c/html5/thumbnails/56.jpg)
감사합니다