Re: Porosity, tortuosity and pore distribution

[Michael Doube]

Hi Marek

(Cc:ing the BoneJ group because your question has interest there too)

How do you define 'Pore Size Distribution'? Please give a precise definition so we can guide you.

Sounds like you need to increase your memory, see the BoneJ FAQ http://bonej.org/faq

You could also try one of the other connected components labelling algorithms http://bonej.org/particles

Michael

On 14 May 2013 16:30, MarekCZ <marek...@gmail.com> wrote:

Hello everyone again.

So I tried to determine the porosity according to the video "bulk volume" (volume of void part/volume of whole particle) and it gives similar results to those obtained by method written in python developed in one of our departments. I also managed to determine the porosity using ImageJ/BoneJ/Volume Fraction. However, I am not able to determine the pore size distribution using ImageJ/BoneJ/Particle Analyzer. I converted the stack to binary and run the Particle Analyzer (the ImageJ went out of memory or got stuck for larger stacks). But I don't know how to get the pore size distribution from the Results table. If anyone could help it will be great.

Thanks alot.

Marek

Dne pondělí, 29. dubna 2013 12:21:07 UTC+2 MarekCZ napsal(a):

Hi everyone!

I am analyzing data of porous particles (polystyrene, polypropylene, etc.) and I want to know properties like porosity, tortuosity and pore size distribution. I determine the particle porosity by function getvolume (volume of pores/volume of pores and particle) according the video "bulk volume" on youtube. Can be functions mop shrinkwrap and mop sat0 omitted during the process (I am not sure about their meaning as I am new in this field)? Is there any function or way how to do that simpler? And is there possibility to find out the particle tortuosity and pore size distribution?

Thanks.

Marek

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[Michael Doube]

Hi Marek,

> Thanks for your quick respond.
> I want to get pore size distribution in form of histogram where on the
> /x/-axis is the volume of pores or characteristic dimension of pores
> (probably diameter), and on the y-axis is the volume fraction or frequency.

For volume: Try the particle analyser in BoneJ, then you can construct a
frequency histogram from the result table in whatever graphing software
you like. You could make it volume weighted by putting particle volume
bins on the x axis and [total sum of particle volumes in that bin] on
the y axis.

For diameter: Run thickness in BoneJ, then hit [h] on your keyboard. The
histogram will show you the relative frequency of each size within the
total volume - however, this is not associated with specific particles.
If you want to associate it with specific particles you will need to use
the particle analyser again and use the per-particle thickness output to
construct your histogram.

I hope it helps,

Michael