Meeting Banner
Abstract #1823

A Method to Improve Transcostal MR-HIFU Sonication in Presence of Electronic Beam Steering

Delphine Elbes1, 2, Sbastien Roujol, 23, Mathilde Merle1, 2, Bruno Quesson1, 2

1IHU LIRYC/ CRCTB, INSERM U1045, University Bordeaux Segalen, Pessac, France; 2Laboratoire dimagerie fonctionnelle et molculaire, UMR 5231 CNRS/ University Bordeaux Segalen, Bordeaux, France, France; 3Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, United States

This study presents a new strategy to perform HIFU through the rib cage using beam steering under real time MR thermometry, to track the respiratory movement or to performed multipoint ablation while avoiding heating of ribs. This method, used to minimize the energy deposition around the bones, was based on electronic deactivation of transducer elements located in front of the rib so called binarized apodization law. This work sought to demonstrate the necessity of an update of the binarized apodization law when using HIFU beam steering in order to increase the safety of the treatment and improve the focusing.

Abstract PDF

Keywords

ablation achieve acoustic acoustical acquisition actual adjacent amplitude anatomical annals around arrhythmias arrow beam benefit beth binary biology black bone bones called cancer compensate covered created curve deaconess deactivated deactivation deflection density deposition developed diagrams displacement displayed efficacy electronic element embedding energy evaluation evolution focal focusing frequency front gain generally geometric geometrically gradient heating horizontal house illustrate implement improve indicated initial insertion intensity invasive journal laws length liver localize located location manual maps masked material matrix maximal measured medical medicine minimize modulus monitored motion natural near necessity oncology onto operating orientation overlaid phantom phys physics pixel pixels plot positioned procedure projected projecting projection proposed real reduced reflective required requires resection respectively respiratory reversal ribs safety scale school section segmentation selected selection several shadow significantly silicon simple skin slices society software solution steering strips surface surgical surrounding target targeted temperature thermal thermometry tissue train transducer transverse treatment update updated volumes watts white