In MRI, the T1 relaxation constant for a tissue type is defined as the time taken for the longitudinal relaxation to recover approximately to 63% of its initial value.
Is there any modification of the T1 time due to application of gradients. Suppose, after application of the RF pulse, the magnetization is tipped completely in the transverse place. If one waits, then 63% of the longitudinal magnetization (z-direction) will recover after T1 seconds. Now, say at the same time I apply a gradient along the x or y direction. Would this have any affect on the longitudinal relaxation time?