Scanner Resolution - dpi calculation

[M.Stehmann]

Dear all,

I'm a new user and i am not sure about my scanner resoultion. I'm using the toolbox BrainRAT and the post mortem imaging rebuilt 2D <=> 3D - stacking individual slices.

There I need to set the Scanner_Resolution in dpi. The default value is 600dpi, but I think my resolution is different.

My information about the scanner images are:
It is 384x384 for a resolution of 0.141x0.143mm^2 in the plane and a slice thickness of 0.34mm (36 slices).

Now i would calculate that my plane FOV is 54.144 x 54.912mm. This would be in inches 2.13x2.16.
Now if i divide my matrixsize 384x384 by my inches 2.13x2.16 i get dpi values of 180dpi and 178dpi.

Is my calculation correct?

And which number of these both is the numer i should take. Is this diffenence of 2dpi important anyway?

Thank you in advance.
Best greetings,
Marina

[souedet]

Dear M. Stehmann,

Sorry to answer your question so late, your scanner resolution calculation seems to be right.
It is not usual that images generated by a flatbed scanner are anisotrope. Meanwhile, voxel sizes are really similar in X and Y directions so you can use 180dpi for the image resolution.

Regards,

[M.Stehmann]

Thank you for your answer. It helped me a lot.
Kind regards,
Marina