Int J Comput Assist Radiol Surg - Visualization support for the planning of hepatic needle placement.

Tópicos

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Resumo

RPOSE: Percutaneous image-guided interventions, such as radiofrequency ablation or biopsy, are using needle-shaped instruments which have to be inserted into a target area without penetrating any vital structure. The established planning workflow is based on viewing 2D slices of a pre-interventional CT or MR scan. However, access paths not parallel to the axial plane are often necessary. For such complicated cases, the planning process is challenging and time consuming if solely based on 2D slices. To overcome these limitations while keeping the well-established workflow, we propose a visualization method that highlights less suited paths directly in the 2D visualizations with which the radiologist is familiar.METHODS: Based on a user defined target point and segmentation masks of relevant risk structures, a risk structure map is computed using GPU accelerated volume rendering and projected onto the 2D slices. This visualization supports the user in defining safe linear access paths by selecting a second point directly in the 2D image slices.RESULTS: In an evaluation for 20 liver radiofrequency ablation cases, 3 experienced radiologists stated for 55% of the cases that the visualization supported the access path choice. The visualization support was rated with an average mark of 2.2. For 2 of the 3 radiologists, a significant reduction of the planning duration by 54 and 50% was observed.CONCLUSIONS: The proposed visualization approach can both accelerate the access path planning for radiofrequency ablation in the liver and facilitate the differentiation between safer and less safe paths.

Resumo Limpo

rpose percutan imageguid intervent radiofrequ ablat biopsi use needleshap instrument insert target area without penetr vital structur establish plan workflow base view d slice preintervent ct mr scan howev access path parallel axial plane often necessari complic case plan process challeng time consum sole base d slice overcom limit keep wellestablish workflow propos visual method highlight less suit path direct d visual radiologist familiarmethod base user defin target point segment mask relev risk structur risk structur map comput use gpu acceler volum render project onto d slice visual support user defin safe linear access path select second point direct d imag slicesresult evalu liver radiofrequ ablat case experienc radiologist state case visual support access path choic visual support rate averag mark radiologist signific reduct plan durat observedconclus propos visual approach can acceler access path plan radiofrequ ablat liver facilit differenti safer less safe path

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