Combined 3D intracardiac echo and ultrasound ablation

Kenneth L. Gentry*, Edward D. Light, Stephen W. Smith

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations

Abstract

We have integrated real time volumetric ultrasound imaging and ultrasound ablation in the same intracardiac catheter. This single device could be used to visualize ablation sites in three dimensions immediately prior to inducing necrosis to eliminate cardiac arrythmias. After the course of therapy, the ablated tissue could be examined ultrasonically. The 12 Fr catheter includes a 2D transducer array for imaging and a single element piston for ablation. The imaging transducer consists of 38 active elements built on a multilayer flex circuit operating at 5.2 Mhz. The ablation piston is a 4 mm by 2 mm piece of air backed PZT-4. Our real time 3D scanner (Volumetrics Medical Imaging) and the 2D array were used to image phantom targets. The spatial peak, temporal average intensity (ISPTA) and acoustic power of the ablation beam were measured using a hydrophone. A 7 mm thick slab of beef was imaged and then ablated for 1 minute. The ultrasound ablation piston produced an ISFTA of nearly 30 W/cm2 and a corresponding acoustic power of 2.6 W. The electrical to acoustic power efficiency of the transducer was 39%. The minute long ablation produced a transmural lesion in the beef 2mm by 4 mm by 7 mm deep.

Original languageEnglish (US)
Pages (from-to)166-173
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5035
DOIs
StatePublished - Sep 12 2003
EventMedical Imaging 2003: Ultrasonic Imaging and Signal Processing - San Diego, CA, United States
Duration: Feb 18 2003Feb 20 2003

Keywords

  • Atrial fibrillation
  • Intracardiac echocardiography
  • Ultrasound ablation
  • Volumetric ultrasound imaging

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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