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21.05.14 |
StefanDelorme
Division ofRadiology
How to receive a signal
Bicycle
dynamo
Coil and rotating
magnet
Rotating magnetic
moment
N
S
x
y
z
M
y
21.05.14 |
StefanDelorme
Division ofRadiology
HF coils: Volume resonators
21.05.14 |
StefanDelorme
Division ofRadiology
T1-weighting
M
z
90°-Puls
Zeit
1,00
•
Multi-pulse experiment
•
90° HF pulse
•
Repetition time TR
21.05.14 |
StefanDelorme
Division ofRadiology
T2-weighting
M
x,y
Zeit t
1,00
0,50
0
M
z
21.05.14 |
StefanDelorme
Division ofRadiology
Gradients
•
Gradient
•
Used to localize an MR signal
•
Coils under electric current
•
Linearly increasing, superimposed fields
21.05.14 |
StefanDelorme
Division ofRadiology
Gradient tube