05 t1 y t2 contrast
TRANSCRIPT
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in conclusion:
• T1 relates to magnetisation
• T2 relates to signal
signal generation
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nuclei, protons and spins
longitudinal relaxation T1
transverse relaxation T2
excitation and relaxation
relation between T1 and T2
signal generation
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0time
100
Longitudinal and TransverseRelaxation:
90o
signal generationrelation between T1 and T2
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0time
100
Longitudinale and TransversaleRelaxation: at the same moment
90o
magnetisation
signal
signal generationrelation between T1 and T2
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short T1
0time
100
90o 90o
signal generationrelation between T1 and T2
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short T1
short T2
0time
100
90o 90o
signal generationrelation between T1 and T2
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long T1
0time
100
90o 90o
signal generationrelation between T1 and T2
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long T1
long T2
0time
100
90o 90o
signal generationrelation between T1 and T2
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0time
100
90o
repetition time
TR90o
signal generationrelation between T1 and T2
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0time
100
90o 90o
echo time
TE
signal generationrelation between T1 and T2
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0time
100
90o 90o
signal generationrelation between T1 and T2
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0time
100
90o 90o
signal generationrelation between T1 and T2
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0time
100
90o 90o
signal generationrelation between T1 and T2
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signal generationrelation between T1 and T2
T1 contrast
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time
90o
longitudinal relaxation = magnetisation
signal generationT1 contrast
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time
90o
magnetisation cannot be measured!
signal generationT1 contrast
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time
90o
signal generationT1 contrast
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time
90o 90o
signal generationT1 contrast
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time
90o 90o
grey
white
signal generationT1 contrast
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time
90o 90o
grey
white
signal generationT1 contrast
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time
90o 90o
grey
white
signal generationT1 contrast
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time
90o 90o
grey
white
signal generationT1 contrast
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TE 10 ms TE 30 ms TE 40 ms
TR 400 ms
signal generationT1 contrast
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T1 weighted images:
TR short
TE short
< 600 ms
< 25 ms
signal generationT1 contrast
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Fat bright
bone marrow
white matter
musclegrey
body fluids
bone
air black
grey matter
TR < 600 ms TE < 25 ms
i.v.contrast
signal generationT1 contrast
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signal generationT1 contrast
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Glioblastoma
T1 T1 with Gadolinium
signal generationT1 contrast
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signal generationT1 contrast
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T2 contrast
signal generationrelation between T1 and T2
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time
90o 90o
signal generationT2 contrast
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time
90o 90o
signal generationT2 contrast
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time
90o 90o
signal generationT2 contrast
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time
90o 90o
signal generationT2 contrast
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THOME
time
90o
signal generationT2 contrast
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time
90o
signal generationT2 contrast
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time
90o
signal generationT2 contrast
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THOME
time
90o
signal generationT2 contrast
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TR 2500 ms
TE 20 msTE 60 ms
TE 100 ms
TE 140 ms
signal generationT2 contrast
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T2 weighted images:
TR long
TE long
> 1800 ms
> 80 ms
signal generationT2 contrast
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signal generationT2 contrast
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signal generationT2 contrast
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T1 T1 + KM
T2
signal generationT2 contrast
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signal generationT2 contrast