Hi Jed,

I am wondering how to draw on an EPI dataset. When I opened the "draw dataset" window and clicked the button "choose dataset ...", I could not see the ROI+orig file (of course, the original space was selected).

I don't know the reason. I can only draw mask on a +tlrc dataset.

I am really wish to know how to draw mask on a +orig dataset, because I want to modify a existing +orig mask into a bigger extended one.

Could you tell me?

Many thanks!

Jed Meltzer wrote:

> I've been doing a lot of this sort of thing lately, so here's
> my 2 cents on the issue (hey, I just noticed for the first time
> that there's no "cent-symbol" on a keyboard. But anyway...)
>
> When I draw ROIS, I find it much more reassuring to draw them
> directly on the EPI image. It's really surprising how poor the
> resolution of these is if you're used to looking at
> interpolated functional maps overlaid on anatomical images.
> It's easy to do this kind of drawing in AFNI. Just open two
> windows "locked together." In one, draw the ROI on top of your
> EPI image, and in the other have the coregistered anatomical
> image with the ROI dataset (currently being drawn) set as the
> functional overlay. That way, you get to control directly
> which voxels are chosen, while at the same time seeing them
> appear (as disturbingly large chunks!) on the anatomical image,
> and it's not any more effort than drawing on the anatomicals.
> -Jed