The effects on thermal lesion shape and size from bubble clouds produced by acoustic droplet vaporization

BioMedical Engineering OnLine

J. Brian Fowlkes¹  Ying Xin²  Aili Zhang²  Lisa X. Xu² 

[1] Department of Radiology, University of Michigan Health System;School of Biomedical Engineering, 400 Med-X Research Institute, Shanghai Jiao Tong University;

关键词: Acoustic droplet vaporization (ADV);    Bubble cloud;    Thermal lesions;    HIFU ablation;   

DOI  :  10.1186/s12938-018-0596-z

来源: DOAJ

【 摘 要 】

Abstract Background Bubbles formed by acoustic droplet vaporization (ADV) have proven to be an effective method for significant enlargement of the thermal lesions produced by high intensity focused ultrasound (HIFU). We investigated the influences of bubble cloud shape and droplet concentration on HIFU thermal lesions, as these relate to the ADV technique. Methods Unlike previous studies where the droplets were simultaneously vaporized with the HIFU exposure for thermal lesion formation, droplets were vaporized by pulse wave (PW) ultrasound prior to continuous wave (CW) ultrasound heating in this experimental study. Under different experimental conditions, we recorded and quantified by the image processing methods the morphology and size of the bubble clouds created and the corresponding thermal lesions formed. Results The results demonstrated that different ADV droplet concentrations produced a variety of thermal lesion shapes and sizes. The lesion volume could be increased using PW ultrasound followed by CW exposure, especially for higher droplet concentrations, e.g. 3.41 × 106/mL yielded a tenfold increase over that seen using CW alone. Conclusion These findings could lead to optimization of HIFU therapy by selecting a bubble forming strategy and droplet concentrations, especially using lower ultrasound powers which is desirable in clinical applications.

【 授权许可】

Unknown