Author:	Wayne (wsr at nih.gov)
History:	2007/05/18: First version 2010/05/20: Updated to use an Overlay 2014/01/21: Added "Measure" option; non-modal dialog 2014/07/16: Fixes bug that caused macros using this plugin to hang
Requires:	ImageJ 1.47v or later
Source:	Concentric_Circles.java
Installation:	Download Concentric_Circles.class to the plugins folder, or subfolder, restart ImageJ, and there will be a new "Concentric Circles" command in the Plugins menu, or submenu.
Description:	This plugin draws concentric circles in a non-destructive overlay. The number of circles, the center, and the radii of the inner and outer circles are specified in a dialog box. If there is an area or line selection, the initial dialog box values are based on that selection. This overlay does not affect measurements of pixel intensity of selections that lie along the circles. The "Measure" option calculates and displays the average intensity along the perimeter of each circle. It ignores the "Line width" setting.

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