<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Quantification of non-rigid liver deformation in radiofrequency ablation interventions using image registration"^^ . "Multi-modal image fusion for image guidance in minimally invasive liver interventions generally requires a registration of pre-operatively acquired images to interventional images of the patient. Whereas rigid registration approaches are fast and can be used in an interventional setting, the actual liver deformation may be non-rigid. The purpose of this paper is to assess the magnitude of non-rigid deformation of the liver between pre-operative and interventional CT images in case of tumor ablations, over the full liver and over parts of the liver that match the volumes typically imaged by a 3D ultrasound transducer. We acquired 3D abdominal CT scans of 38 patients that underwent radiofrequency ablation of liver tumors, pre-operative CT images as well as intra-operative CT images. To determine the magnitude of liver deformation due to pose changes and respiration, we non-rigidly registered the pre-operative CT scan to the intra-operative CT scan. By fitting this deformation to a rigid transformation in a region of interest and computing the residual displacements, the non-rigid deformation part can be quantified. We performed quantifications over the complete liver, as well as for two volumes of interest representative for sub-xiphoidal and inter-costal 3D ultrasound acquisitions. The results showed that a substantial amount of non-rigid deformation was found, and rotation of patient's pose and deep inhalation caused significant liver deformation. Hence we concluded that non-rigid motion correction in the interventions should be taken into account."^^ . "2018-08-29" . "63" . "17" . . "IOP"^^ . . . "Physics in Medicine & Biology"^^ . . . "13616560" . . . . . . . . . . . . . . . . . . . "Theo van"^^ . "Walsum"^^ . "Theo van Walsum"^^ . . "Ha"^^ . "Luu Manh"^^ . "Ha Luu Manh"^^ . . "Wiro"^^ . "Niessen"^^ . "Wiro Niessen"^^ . . "Stefan"^^ . "Klein"^^ . "Stefan Klein"^^ . . "Adriaan"^^ . "Moelker"^^ . "Adriaan Moelker"^^ . . . . . "HTML Summary of #3046 \n\nQuantification of non-rigid liver deformation in radiofrequency ablation interventions using image registration\n\n" . "text/html" . . . "Electronics and Computer Engineering"@en . . . "ISI-indexed journals"@en . .