<html>
<head>
<style><!--
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
font-size: 10pt;
font-family:Tahoma
}
--></style>
</head>
<body class='hmmessage'>
Can anyone suggest an algorithm to interpolate/extrapolate ROI based on a set of contours?<br><br>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.<br><br>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.<br><br>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?<br><br>Thanks!<br>Xiaofeng Zhao<br>
<a href="http://www.xzing.org" target="_blank"></a><br><br> </body>
</html>