Int J Comput Assist Radiol Surg - Interactive navigation of segmented MR angiograms using simultaneous curved planar and volume visualizations.

Tópicos

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Resumo

RPOSE: Interactive visualization is required to inspect and monitor the automatic segmentation of vessels derived from contrast-enhanced magnetic resonance angiography (CE-MRA). A dual-view visualization scheme consisting of curved planar reformation (CPR) and direct volume rendering (DVR) was developed for this purpose and tested.METHODS: A dual view visualization scheme was developed using the vessel pathline for both camera position and rotation in 3D, greatly reducing the degrees of freedom (DOF) required for navigation. Pathline-based navigation facilitates coupling of the CPR and DVR views, as local position and orientation can be matched precisely. The new technique was compared to traditional techniques in a user study. Layperson users were required to perform a visual search task that involves checking for (minor) errors in segmentations of MRA data from a software phantom. The task requires the user to examine both views.RESULTS: Pathline-based navigation and coupling of CPR and DVR provide user speed performance improvements in a vessel inspection task. Interactive MRA visualization with this method, where rotational degrees of freedom were reduced, had no negative effect.CONCLUSIONS: The DOF reduction achieved by the new navigation technique is beneficial to user performance. The technique is promising and merits comprehensive evaluation in a realistic clinical setting.

Resumo Limpo

rpose interact visual requir inspect monitor automat segment vessel deriv contrastenhanc magnet reson angiographi cemra dualview visual scheme consist curv planar reform cpr direct volum render dvr develop purpos testedmethod dual view visual scheme develop use vessel pathlin camera posit rotat d great reduc degre freedom dof requir navig pathlinebas navig facilit coupl cpr dvr view local posit orient can match precis new techniqu compar tradit techniqu user studi layperson user requir perform visual search task involv check minor error segment mra data softwar phantom task requir user examin viewsresult pathlinebas navig coupl cpr dvr provid user speed perform improv vessel inspect task interact mra visual method rotat degre freedom reduc negat effectconclus dof reduct achiev new navig techniqu benefici user perform techniqu promis merit comprehens evalu realist clinic set

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