  In porous material research, one main interest of nuclear magnetic resonance
(NMR) diffusion experiments is the determination of the exact shape of pores.
It has been a longstanding ques-tion if this is achievable in principle. In
this work, we present a method using short diffusion gradient pulses only,
which is able to reveal the shape of arbitrary closed pores without rely-ing on
a priori knowledge. In comparison to former approaches, the method has reduced
de-mands on relaxation times and allows for a more flexible NMR sequence
design, since, for example, stimulated echoes can be used.
