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==Saturation Recovery==

In the Saturation Recovery experiment, the time it takes for the spins to recover from a saturated state is measured. If one has a probehead where the use of gradients is possible, this is quite easy:

<pulse title="saturation recovery pulse sequence for T1 measurement using pulsed field gradient">
anchors:   @a     @a2       @b       @c    @d 
disp:     2@a    8@a2      4@b      2@c   8@d   
time:  rlx @a tg  @a2  t1   @b   dt  @c aq @d 
rf H:                     90@b    acq@c-----d
rf x:   wp@a-------a2

delay rlx: hide=true
delay t1: label=\tau
delay dt: hide=true
delay tg: hide=true

acq: type=fid

rfchan H: label=^1H
rfchan x: label=Grad.\ x
</pulse>

However without the possibility to use gradients, a set of several pulses in a short timespan (often with decreasing delays between the pulses in this pulsetrain) can be used to saturate the spin system:

<pulse title="saturation recovery pulse sequence for T1 measurement using saturating pulse train">
anchors:   @a    @s1    @s2    @s3    @s4    @s5     @b    @c    @d 
disp:     2@a   2@s1   4@s2   3@s3   2@s4   1@s5    6@b   1@c   8@d   
time:  rlx @a t1 @s1 t2 @s2 t3 @s3 t4 @s4 t5 @s5 tau @b dt @c aq @d 
rf H:    90@a  90@s1  90@s2  90@s3  90@s4  90@s5   90@b acq@c-----d

delay rlx: hide=true
delay tau: label=\tau
delay t1: hide=true
delay t2: hide=true
delay t3: hide=true
delay t4: hide=true
delay t5: hide=true
delay dt: hide=true

acq: type=fid

rfchan H: label=^1H
</pulse>

[[Category:T1 relaxation]]
[[Category:Pulse sequence drawing]]

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