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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Sparse random ultrasound phased array for focal surgery
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Sparse random ultrasound phased array for focal surgery

机译：局部手术的稀疏随机超声相控阵

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Ultrasound phased arrays offer several advantages over singlenfocused transducer technology, enabling electronically programmablensynthesis of focal size and shape, as well as position. While phasednarrays have been employed for medical diagnostic and therapeuticn(hyperthermia) applications, there remain fundamental problemsnassociated with their use for surgery. These problems stem largely fromnthe small size of each array element dictated by the wavelength employednat surgical application frequencies (2-4 MHz), the array aperture sizenrequired for the desired focal characteristics, and the number of arraynelements and electronic drive channels required to provide RF energy tonthe entire array. The present work involves the theoretical andnexperimental examination of novel ultrasound phased arrays consisting ofnarray elements larger than one wavelength, minimizing the number ofnelements in an aperture through a combination of geometric focusing,ndirective beams, and sparse random placement of array elements, forntissue ablation applications. A hexagonally packed array consisting ofn108 8-mm-diameter circular elements mounted on a spherical shell wasnmodeled theoretically and a prototype array was constructed to examinenthe feasibility of sparse random array configurations for focal surgery.nA randomly selected subset of elements of the prototype test array (64nof 108 available channels) was driven at 2.1 MHz with a 64-channelndigitally controlled RF drive system. The performance of the prototypenarray was evaluated by comparing field data obtained from theoreticalnmodeling to that obtained experimentally via hydrophone scanning. Thenresults of that comparison, along with total acoustic powernmeasurements, suggest that the use of sparse random phased arrays fornfocal surgery is feasible, and that the nature of array packing is annimportant determinant to observed performance
机译：超声相控阵相对于单焦点换能器技术具有多个优势，可实现焦距大小，形状以及位置的电子可编程合成。虽然phasednarrays已用于医学诊断和治疗（体温过高）应用，但仍存在与它们在外科手术中使用相关的基本问题。这些问题主要是由于手术应用频率（2-4 MHz）所使用的波长，所需要的聚焦特性所需的阵列孔径大小以及提供RF能量所需的阵列元件和电子驱动通道的数量所决定的，每个阵列元件的尺寸很小。整个阵列。本工作涉及对新型超声相控阵的理论和实验研究，该超声相控阵由大于一个波长的n个阵列元素组成，通过几何聚焦，定向光束和稀疏随机放置的阵列元素的组合，将孔中的元素数量减少到最小，结节切除应用。理论上对由n108个直径为8mm的圆形元件安装在球形外壳上组成的六边形排列阵列进行了建模，并构建了原型阵列以研究稀疏随机阵列配置在局部手术中的可行性.n随机选择的原型测试阵列元素的子集（使用64通道数字控制的RF驱动系统以2.1 MHz的频率驱动108个可用通道中的64个）。通过比较从理论模型获得的现场数据与通过水听器扫描实验获得的现场数据，评估了原型阵列的性能。然后，该比较的结果以及总声功率测量结果表明，稀疏随机相控阵用于非聚焦手术是可行的，并且阵列包装的性质对于观察到的性能至关重要

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