Int J Comput Assist Radiol Surg - A study of porcine liver motion during respiration for improving targeting in image-guided needle placements.

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Resumo

RPOSE: Liver motion due to respiration restricts targeting and needle placement accuracy during image-guided interventional procedures. Breath holds, imaging techniques, and navigation systems are used to improve targeting accuracy. Data of in-vivo liver behavior under respiration can enhance these approaches.METHODS: An experimental study was performed using the swine model to capture the dynamics of liver motion during respiration using needles tipped with electromagnetic sensors. The swine liver was segmented into four lobes (right lateral, right medial, left medial and left lateral), and two sensor-tipped needles were placed in each location to acquire representative displacement data.RESULTS: Maximum displacement was found to occur in the left medial and left lateral lobes, in the anterior-posterior direction. Significant lobe-dependent variation in motion behavior was recorded, but a variation within a lobe was minimal and independent of needle approach. Magnitude of displacement in all lobes was found to be monotonically correlated to breathing volume. Displacement of liver was found to be out of phase with breathing by approximately 2?Hz. The positioning of the animal was also found to influence direction and magnitude of liver displacement in different lobes.CONCLUSIONS: We have presented previously unavailable data and insight into the role of easily controllable parameters such as breathing volume, patient positioning, and lobe-specific heterogeneity in the displacement of liver due to respiration.

Resumo Limpo

rpose liver motion due respir restrict target needl placement accuraci imageguid intervent procedur breath hold imag techniqu navig system use improv target accuraci data invivo liver behavior respir can enhanc approachesmethod experiment studi perform use swine model captur dynam liver motion respir use needl tip electromagnet sensor swine liver segment four lobe right later right medial left medial left later two sensortip needl place locat acquir repres displac dataresult maximum displac found occur left medial left later lobe anteriorposterior direct signific lobedepend variat motion behavior record variat within lobe minim independ needl approach magnitud displac lobe found monoton correl breath volum displac liver found phase breath approxim hz posit anim also found influenc direct magnitud liver displac differ lobesconclus present previous unavail data insight role easili control paramet breath volum patient posit lobespecif heterogen displac liver due respir

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