Biomedical Engineering Reference
In-Depth Information
Fig. 17.3
MRI principles
What do we measure
?
Two important time constants:
T1
-
time to recover longitudinal magnetization
-
realigning to B
0
Ranges from 200 ms to 2 s
.
T2
-
time to diphase
-
lose horizontal
Ranges from 30 to 500 ms
Differences in T1 and T2 provide the basis in signal intensities and tissue contrast
