[Insight-developers] Questions about ROI implementation

[Stephen R. Aylward]

Good idea - if you have the ROI class(?) just use the evaluate function 
of any class over which it is templated, then your ROI can be defined 
using spatialObjects or spatialFunctions - just as they are being used 
by the conditional iterators.

I am headed out of town for two weeks, but perhaps Julien Jomier can 
work with you on this - he did most of the spatialObjects work...

Stephen

Kent Williams wrote:
> I'm supposed to implement an ROI (Region of Interest) type in ITK.  ROIs  are 
> used in Brains2 to outline brain features, and are most often manually 
> traced, slice by slice, then combined to define a solid.  So basically they 
> are a list of 2D points in a slice.
> 
> I have 2 basic questions about implementing ROIs:
> 
> 1. I'll derive them from itk::SpatialObject, but is there a subclass of 
> itk::SpatialObject that would be more apropos?  Looking through the 
> documentation and source code, I'm not picking up many clues.  It looks like 
> it's straightforward to read in the ROI file, create itk:SpatialObjectPoint 
> objects and add them as children.
> 
> It also looks as though deriving from a 2D BlobSpatialObject would be close; 
> the main behavior we need to add for our purposes is a way to add and remove 
> points, for interactive tracing.
> 
> 2. Is there any class I should inherit from for reading and writing a file of 
> our ROI files? I know about ImageIO but I'm not seeing any similar framework 
> for reading and writing spatial objects.  Should there be such a framework?
> 
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-- 
===============================================
Dr. Stephen R. Aylward
Assistant Professor of Radiology
Adjunct Assistant Professor of Computer Science
http://caddlab.rad.unc.edu
aylward@unc.edu
(919) 966-9695