  Efficient phase cycling schemes remain a challenge for NMR techniques if the
pulse sequences involve a large number of rf-pulses. Especially complex is the
Carr Purcell Meiboom Gill (CPMG) pulse sequence where the number of rf-pulses
can range from hundreds to several thousands. Our recent implementation of
Magnetic Resonance Pore Imaging (MRPI) is based on a CPMG rf-pulse sequence in
order to refocus the effect of internal gradients inherent in porous media.
While the spin dynamics for spin-$1/2$ systems in CPMG like experiments are
well understood it is still not straight forward to separate the desired
pathway from the spectrum of unwanted coherence pathways. In this contribution
we apply Phase Incremented Echo Train Acquisition (PIETA) to MRPI. We show how
PIETA offers a convenient way to implement a working phase cycling scheme and
how it allows one to gain deeper insights into the amplitudes of undesired
pathways.
