Recent content by Wo0p

That's awesome. Really good software! However it only reads files in ANALYZE format, anyone know of a tool that plays nice with Nifti?

That's what google says as well We currently have two groups of subjects. Between subjects the data is similar but not quite the same. We can make comparison for the entire brain... but we also want to compare only within certain brain structures. It would be ideal to have the ROIs in...

Hello all, experts and otherwise. I'm looking for some links to software and documentation for selecting Regions of Interest (ROI) in MRI data of the human brain. Saving ROIs is a must. Any tips also appreciated. Thank you!

As per Enuma's initial suggestion, and after some sanity checking, I decided to go with a vanilla t-test using absolute difference between the two images d=|y(1i)-y(2i)| as my distance measure... In Matlab its implemented as ttest2(A,B,pvalue)

Gotcha. All I wanted to say here was that there was no geometrical correspondence, as you put it, between the two images. As far as I understand (which isn't very far), the t-test assumes this kind of relationship. I will try out both the Chi-squared and regression approach and post my results.

Really? This might be exactly what I need OK you lost me here. What is the vector u? Is it something I know is it part of the regressing? "If b is statistically significant" You mean sign. different from 0? I have never ever come across these methods, so I'm probably missing...

EnumaElish, Whoah... thanks for that reply. Great read and very insightful :) However I now have several new questions: 1. You mention two distance metrics, the first one di = 1 if two intensities at a pixel are equal, di = 0 otherwise and the second di = |y(1i) - y(2i)| where y is "some...

Anyone? To clarify my question... I would be selecting regions which look as though they belong to the same anatomy Then I need to tell if intensities in the two regions are significantly different If it matters, I can select regions which contain the same no. of voxels Please let...

Hi EnumaElish, The images are of the human brain They would be very similar except one is (slightly) distorted Otherwise they would be the same Hence no exact spatial correspondence

Hi all, I have two images, without any exact spatial correspondence I want to find if the difference between two regions is statistically significant How would I do this?

Why so hard? Just plot regular, then remove the region you don't want Edit: What I mean is, you can create masks and use them to selectively crop out undesirable portions of your graph (e.g. the singularities that occur along the y=-2x line) Note that your viewport will still be rectangular x...

berkeman: you're quite right, ty

If you're stuck on implementation, I advise you to study the 74LS137 3-to-8 decoder :)