In radiotherapy treatment planning

in order to delivery of a high dose to the tumor accurately while maintaining an acceptably low dose to the normal tissues

particularly those adjacent to the target

it is necessary to reconstruct the three dimensional anatomical structure from planar contour information.The existing methods could not satisfy the clinical demand in terms of the speed and accuracy.By improving the isosurface extraction algorithm

we designed a fast 3D-reconstruction algorithm pipeline implemented by Visualization Tool Kit (VTK).A serial of test results from real patient image dataset show that this method could reconstruct the surface smoothly and evade the "ladder effect" effectively.The number of points and triangles had been reduced in great extent.The rendering time had been decreased from 8 seconds to less than 3 seconds by comparing with standard iso-extraction algorithm.On the premise of preserving the original anatomical structure

this method improved the reconstruction effect

accelerated the rendering speed and it would be applied to not only accurate radiotherapy treatment planning system but also other fields that need 3D reconstruction.