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