Hi Chengcheng, the segmentation itself makes no assumptions on the fact that the lumen is brighter than the outside, however the initialization - like colliding fronts and fast marching - does by default. A trivial way to go around this is to negate the image before running the segmentation. There's actually no script in vmtk to do that, but this pipe should do the trick:
vmtkimagecompose -ifile image.vti -i2file image.vti --pipe vmtkimagecompose -i2file image.vti -negatei2 1 -ofile negated_image.vti I just added a switch to vmtkimageinitialization that allows to negate the image while initializing. I'm curious to see if this helps, please keep me posted. Best regards Luca On Nov 10, 2010, at 7:08 PM, Chengcheng Zhu wrote: > Hi, > > I have tried to segment carotid artery bifurcation using black-blood > T1 or T2 weighted MR images, but the result was very bad. However, it > works quite well on time-of-fight MR images. Does the vessel must be > bright (hyperintense) for VMTK to segment? Thank you. > > Best Wishes > > Chengcheng > > ------------------------------------------------------------------------------ > The Next 800 Companies to Lead America's Growth: New Video Whitepaper > David G. Thomson, author of the best-selling book "Blueprint to a > Billion" shares his insights and actions to help propel your > business during the next growth cycle. Listen Now! > http://p.sf.net/sfu/SAP-dev2dev > _______________________________________________ > vmtk-users mailing list > vmtk-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/vmtk-users ------------------------------------------------------------------------------ Centralized Desktop Delivery: Dell and VMware Reference Architecture Simplifying enterprise desktop deployment and management using Dell EqualLogic storage and VMware View: A highly scalable, end-to-end client virtualization framework. Read more! http://p.sf.net/sfu/dell-eql-dev2dev _______________________________________________ vmtk-users mailing list vmtk-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/vmtk-users
