A

Fig. 2. Longitudinal magnetization returns to equilibrium with time constant T1. The T1 contrast between tissue A and B is greatest at short TR (600 ms) and TE.

Fig. 2. Longitudinal magnetization returns to equilibrium with time constant T1. The T1 contrast between tissue A and B is greatest at short TR (600 ms) and TE.

80msec TE (msec)

Fig. 3. The transverse magnetization decays to zero with time constant T2: a long TR and TE (80 ms) will maximize the tissue contrast.

80msec TE (msec)

Fig. 3. The transverse magnetization decays to zero with time constant T2: a long TR and TE (80 ms) will maximize the tissue contrast.

but short TE (echo time), both of which will be discussed in more detail later in the chapter. (13)

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