Abstract
We now proceed to the situation of θ = 180°, in which Mz is inverted (Mz = – MO; Fig. 25). We still have to turn Mz in the xy plane through a 90° pulse and then collect the echo through a 180° pulse. This sequence is called inversion recovery (IR); it simply incorporates an inversion pulse in front of the standard SE sequence. The new variable, called inversion time (TI), is the delay between the inversion and the excitation pulses. Thus, the familiar T1 curve is modified two-fold: it is “stretched” to twice the (vertical) distance as before, and it has to cross the zero (null) point (Fig. 26).
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© 2009 Springer-Verlag Berlin Heidelberg
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(2009). Inversion Recovery. In: Clinical MR Imaging and Physics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-78023-6_15
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DOI: https://doi.org/10.1007/978-3-540-78023-6_15
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