Question about ROI's

[Adam Hacking]

Dear List,

I am working on a macro to analyze a series of images where the region of interest is a circle that excludes a smaller circle at the "core" of the first selection. In essence, the area of interest is a "donut" shape.

Can I get ImageJ to create a new ROI analysis limited to the "donut" shaped region or do I have to get the results for both regions and subtract the core from the entire region ? If it is the latter, how are the results from multiple ROI's referenced.

Many thanks

Adam


________________________________________________________________         Dr. S Adam Hacking, Post Doctoral Fellow
JTN Wong Laboratories for Mineralized Tissue Research,
Center for Bone and Periodontal Research,
McGill University     740 Dr. Penfield Ave. Rm. 2300A
Montreal, QC, Canada H3A 1A4
Ph.:  514-398-5112
Fax: [phone]

[Justin McGrath]

You can try this

Select the outer circle that you're interested in
setKeyDown("alt")
Select the circle that you want to exclude
setKeyDown("none")

It should create the ROI that you want.

Justin

On Nov 23, 2007 2:49 PM, Adam Hacking, Dr. <[hidden email]> wrote:

> Dear List,
>
> I am working on a macro to analyze a series of images where the region of interest is a circle that excludes a smaller circle at the "core" of the first selection. In essence, the area of interest is a "donut" shape.
>
> Can I get ImageJ to create a new ROI analysis limited to the "donut" shaped region or do I have to get the results for both regions and subtract the core from the entire region ? If it is the latter, how are the results from multiple ROI's referenced.
>
> Many thanks
>
> Adam
>
>
> ________________________________________________________________         Dr. S Adam Hacking, Post Doctoral Fellow
> JTN Wong Laboratories for Mineralized Tissue Research,
> Center for Bone and Periodontal Research,
> McGill University     740 Dr. Penfield Ave. Rm. 2300A
> Montreal, QC, Canada H3A 1A4
> Ph.:  514-398-5112
> Fax: [phone]
>