Imaging Navigation Aiding Destroying Focal Liver Lesions
Czudek S., Anton Pelikan MD, Spinczyk D, Vávra P., Zonča P.

Article presents methodology of computer aided destroying focal liver lesions using imaging navigation system. Methodology allows generation of personalized anatomical model of patient's liver based on computer tomography screening with contract media of abdominal cavity, registration of edited anatomical model relative to real patient's position on operation block, presentation of surgical tools position during treatment on the liver's anatomical model and non-direct monitoring of ablation process of focal lesions. Liver anatomy model comprises organ's and focal lesions' surface and central lines of vascular structures in liver. Generation of personalized patient's model has been verified based on anonymized abdominal cavity computer tomography with contrast media screening cases. It gives an ability of manual correction of results and planning of entry point, target point and surgical tool trajectory. Registration of patient's position happens in two stages: stiff registration using Horn algorithm and non-stiff registration using deformation field based on splines. During treatment, position of ablation needle on anatomical liver's model is visualized and ablation process is monitored through presentation of graphs of process' electrical parameters: among them are electrical tissue resistance around ablation needle, momentary power and total energy delivered by power with radio frequency generator to liver's parenchyma.

Full Text: PDF     DOI: 10.15640/ijhs.v3n2a9