HELP! Measure of the distance between nucleus surface and a particle

[jesrog]

Hello everyone! I am new in ImageJ and I would like to measure the distance between the surface of the nucleus and a particle (of course the minimum distance). Until now, I can only measure the distance between their crentoids but that is useless for me. A mention, there are more than one nuclei in the image and the same for the particles so the thing is to measure the distance between each nucleus and the closest particle to it.

Thanks in advance!

JR