Int J Comput Assist Radiol Surg - Real-time tracking of liver motion and deformation using a flexible needle.

Tópicos

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Resumo

RPOSE: A real-time 3D image guidance system is needed to facilitate treatment of liver masses using radiofrequency ablation, for example. This study investigates the feasibility and accuracy of using an electromagnetically tracked flexible needle inserted into the liver to track liver motion and deformation.METHODS: This proof-of-principle study was conducted both ex vivo and in vivo with a CT scanner taking the place of an electromagnetic tracking system as the spatial tracker. Deformations of excised livers were artificially created by altering the shape of the stage on which the excised livers rested. Free breathing or controlled ventilation created deformations of live swine livers. The positions of the needle and test targets were determined through CT scans. The shape of the needle was reconstructed using data simulating multiple embedded electromagnetic sensors. Displacement of liver tissues in the vicinity of the needle was derived from the change in the reconstructed shape of the needle.RESULTS: The needle shape was successfully reconstructed with tracking information of two on-needle points. Within 30 mm of the needle, the registration error of implanted test targets was 2.4 ? 1.0 mm ex vivo and 2.8 ? 1.5 mm in vivo.CONCLUSION: A practical approach was developed to measure the motion and deformation of the liver in real time within a region of interest. The approach relies on redesigning the often-used seeker needle to include embedded electromagnetic tracking sensors. With the nonrigid motion and deformation information of the tracked needle, a single- or multimodality 3D image of the intraprocedural liver, now clinically obtained with some delay, can be updated continuously to monitor intraprocedural changes in hepatic anatomy. This capability may be useful in radiofrequency ablation and other percutaneous ablative procedures.

Resumo Limpo

rpose realtim d imag guidanc system need facilit treatment liver mass use radiofrequ ablat exampl studi investig feasibl accuraci use electromagnet track flexibl needl insert liver track liver motion deformationmethod proofofprincipl studi conduct ex vivo vivo ct scanner take place electromagnet track system spatial tracker deform excis liver artifici creat alter shape stage excis liver rest free breath control ventil creat deform live swine liver posit needl test target determin ct scan shape needl reconstruct use data simul multipl embed electromagnet sensor displac liver tissu vicin needl deriv chang reconstruct shape needleresult needl shape success reconstruct track inform two onneedl point within mm needl registr error implant test target mm ex vivo mm vivoconclus practic approach develop measur motion deform liver real time within region interest approach reli redesign oftenus seeker needl includ embed electromagnet track sensor nonrigid motion deform inform track needl singl multimod d imag intraprocedur liver now clinic obtain delay can updat continu monitor intraprocedur chang hepat anatomi capabl may use radiofrequ ablat percutan ablat procedur

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