超声波传感器
材料科学
声学
放射科
核医学
传感器
医学物理学
辐射
光学
放射治疗
作者
Frederic L. Lizzi,Robert Muratore,Cheri X. Deng,Jeffrey A. Ketterling,S. Kaisar Alam,Samuel Mikaelian,Andrew Kalisz
标识
DOI:10.1016/s0301-5629(03)01052-4
摘要
This report describes a monitoring technique for high-intensity focused ultrasound (US), or HIFU, lesions, including protein-denaturing lesions (PDLs) and those made for noninvasive cardiac therapy and tumor treatment in the eye, liver and other organs. Designed to sense the increased stiffness of a HIFU lesion, this technique uniquely utilizes the radiation force of the therapeutic US beam as an elastographic push to detect relative stiffness changes. Feasibility was demonstrated with computer simulations (treating acoustically induced displacements, concomitant heating, and US displacement-estimation algorithms) and pilot in vitro experimental studies, which agree qualitatively in differentiating HIFU lesions from normal tissue. Detectable motion can be induced by a single 5 ms push with temperatures well below those needed to form a lesion. Conversely, because the characteristic heat diffusion time is much longer than the characteristic relaxation time following a push, properly timed multiple therapy pulses will form lesions while providing precise control during therapy. (E-mail: muratore@rrinyc.org) © 2003 World Federation for Ultrasound in Medicine & Biology.
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