TR and T1-weighting
If TR is short and if tissue A has a longer T1 than tissue B, the longitudinal magnetization of tissue A will recover less than the longitudinal magnetization of tissue B.
Thus, the transverse magnetization amplitude of tissue B will be higher after the next excitation.
In the graphs below :
- The first part of the following curves corresponds to the longitudinal magnetization recovery after the first excitation.
- TR is the delay between excitations.
- The second part corresponds to the transverse magnetization decay after the second excitation.
- The MR signal is acquired at time TE after excitation.
By setting the TR to short values, tissue contrast will depend on differences in longitudinal magnetization recovery (T1).
Ziehm Vision RFD Hybrid Edition: Mobility and flexibility – the difference in an emergency
Olea Medical® literature meta-analysis on CTP thresholds in acute stroke
Olea Medical® case report on early & late MR diffusion follow-up of a stroke using CT perfusion.
Agfa HealthCare Special Report Dose Management: because life is precious.