[Insight-users] (no subject)

[Xiaofeng Z]

Can anyone suggest an algorithm to interpolate/extrapolate ROI based on a set of contours?

I'm trying to understand how a volume is computed in a radiotherapy treatment planning system.  The vendor's documentation states that shape-based interpolation is used to construct 3D volume from a stack of 2D contours.  Specifically, a distance map based interpolation is used.

What I don't quite understand is the way they cap off the two ends of the contour stack to obtain a rounded ends of the volume.  With this rounded ends, the volume of a box of demension 4cm x 4cm x 3cm (3 slices of 4cm x 4cm contour) was computed to be 40 cm^3.

I'm not aware of any robust algorithm can be used to create a rounded ends to a stack of say square contours of the same size and location.  I'd appreciate if anyone can provide suggestions?

Thanks!
Xiaofeng Zhao



 		 	   		  
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