Re: Annular Region of Interest

Posted by dscho on Jul 25, 2009; 11:28pm
URL: http://imagej.273.s1.nabble.com/Annular-Region-of-Interest-tp3691656p3691659.html

Hi,

On Sat, 25 Jul 2009, Wayne Rasband wrote:

> On Jul 24, 2009, at 6:30 AM, Graham Arden wrote:
>
> >Is it possible to produce annular ROI in imageJ.  I have a number of
> >nuclear medicine phantom images which consist of an area of high
> >activity surrounding an area of low activity and I wsih to define an
> >annular ROI to measure the maximum, minimum, mean and standard
> >deviation of the counts in the hot and cold areas.
> >
> >Any suggestions would be gratefully received
>
> You can create a ring-shaped selection by using the elliptical selection
> tool twice, first to create the outer boundary and then, with the alt
> key down, to create the inner boundary.

In many Linux setups, Alt+Drag moves the Window (which is especially
useful on small screens such as Netbook screens).  But you can still use
this feature: just do Ctrl+Alt+Drag.

Ciao,
Dscho