Int J Comput Assist Radiol Surg - Accurate image reconstruction using real C-arm data from a Circle-plus-arc trajectory.

Tópicos

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Resumo

JECTIVE: Developing an efficient tool for accurate three-dimensional imaging from projections measured with C-arm systems.MATERIAL AND METHODS: A circle-plus-arc trajectory, which is complete and thus amenable to accurate reconstruction, is used. This trajectory is particularly attractive as its implementation does not require moving the patient. For reconstruction, we use the "M-line method", which allows processing the data in the efficient filtered backprojection mode. This method also offers the advantage of not requiring an ideal data acquisition geometry, i.e., the M-line algorithm can account for known deviations in the scanning geometry, which is important given that sizeable deviations are generally encountered in C-arm imaging.RESULTS: A robust implementation scheme of the "M-line method" that applies straightforwardly to real C-arm data is presented. In particular, a numerically stable technique to compute the view-dependent derivative with respect to the source trajectory parameter is applied, and an efficient way to compute the p-line backprojection intervals via a polygonal weighting mask is presented. Projection data of an anthropomorphic thorax phantom were acquired on a medical C-arm scanner and used to demonstrate the benefit of using a complete data acquisition geometry with an accurate reconstruction algorithm versus using a state-of-the-art implementation of the conventional Feldkamp algorithm with a circular short scan of cone-beam data. A significant image quality improvement based on visual assessment is shown in terms of cone-beam artifacts.

Resumo Limpo

jectiv develop effici tool accur threedimension imag project measur carm systemsmateri method circleplusarc trajectori complet thus amen accur reconstruct use trajectori particular attract implement requir move patient reconstruct use mline method allow process data effici filter backproject mode method also offer advantag requir ideal data acquisit geometri ie mline algorithm can account known deviat scan geometri import given sizeabl deviat general encount carm imagingresult robust implement scheme mline method appli straightforward real carm data present particular numer stabl techniqu comput viewdepend deriv respect sourc trajectori paramet appli effici way comput pline backproject interv via polygon weight mask present project data anthropomorph thorax phantom acquir medic carm scanner use demonstr benefit use complet data acquisit geometri accur reconstruct algorithm versus use stateoftheart implement convent feldkamp algorithm circular short scan conebeam data signific imag qualiti improv base visual assess shown term conebeam artifact

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