Meeting Banner
Abstract #0558

Clinical Demonstration of Transient Cavitation Induced Errors on PRFS MR Thermometry During RF Ablation in Liver, Using Simultaneous US/MR Imaging

Lorena Petrusca1, Sylvain Terraz1, Magalie Viallon2, Vincent Auboiroux1, Li Pan3, Shelby Brunke4, Christoph Becker1, Rares Salomir1

1Radiology Department, Geneva University Hospital, Geneva, Switzerland; 2Radiology Department, Geneva University Hospital, Geneva , Switzerland; 3Center for Applied Medical Imaging, Siemens Corporate Research, Baltimore, United States; 4US Division, Siemens Medical Solutions, Issaquah, WA, United States

A clinical RF ablation study of HCC nodule in liver using simultaneous US and MR dual-monitoring is presented here. The interactive targeting mode enables effective and sufficiently rapid electrode placement in clinical practice. RFA induces dynamic changes in magnetic buck susceptibility, major distortion of PRFS thermometry including butterfly-like and false negative temperature of the MRT maps in the RF electrode vicinity being observed. These errors were correlated with the induced bubbles of thermal cavitation visualized in US imaging.

Abstract PDF Presentation Video

Keywords

abdominal ablation achieved acquisition acquisitions anatomic anode appropriate around array arrow artifact attached avoiding bandwidth beam bubble bubbles bulk carcinoma cathode clearly clinical coagulation coil compatible corporate critical curves customized designed detected device diameter disruptive distortion division earlier early effective electrode embedded enables equidistant equipped errors example feasible feet field fixed frame frames free freedom general guidance heated heating holder identified indicating induced inside interactive interferences interventions investigate lesions like liver magnitude maps matrix mediated medical minutes modalities mode monitoring needle negative oblique offering opportunities optimal orbital orientation orthogonal part particularly pixel pixels placed placement position positioned power practice prescribed presence progression radial reabsorbed readjusted real realized received reconstructions regarding reported respiratory review ring room rotations scanner shape shield simultaneous slice slices sliding solutions specially stage strengths structures subsequent sufficiently supine susceptibility symmetrical systematic systematically target targeting temperature thermal thermometry tool track trajectory translation update views visible visualization white width window