7.5 MHz dual-layer transducer array for 3-D rectilinear imaging.
7.5 MHz dual-layer transducer array for 3-D rectilinear imaging.
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DOI：
10.1177/016173461103300305
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发表时间：
2011-07
影响因子：
2.3
通讯作者：
Yen JT
中科院分区：
文献类型：
--
作者：
Chen Y;Nguyen M;Yen JT
与制造和互连相关的困难限制了具有大量元件（bbb5000）的二维超声换能器阵列的发展。在之前的工作中，我们描述了一种中心频率为5mhz的PZT-P[VDF-TrFE]双层换能器，它使用两个垂直的一维阵列进行三维直线成像。这种设计大大减少了通道数和制造复杂性，使3d成像更容易实现。更高的频率（bbb50 - 5MHz）更常用于临床成像传感器附近的目标，如乳房，颈动脉和肌肉骨骼。在本文中，我们提出了一个7.5 MHz的双层传感器阵列用于三维直线成像。设计并制作了一个改进的声学叠加模型。PZT单元被细分以消除横向耦合。这种分切工艺使PZT成为2-2复合材料，有助于提高传感器的灵敏度和带宽。通过将换能器与Verasonics数据采集系统（VDAS）连接，获得了全合成孔径三维数据集。然后进行脱机三维波束成形以获得多丝幻影和囊肿幻影的体积。应用广义相干因子（GCF）提高囊肿图像的对比度。测量到换能器- 6 dB分数带宽为71%，中心频率为7.5 MHz。与模拟波束宽度0.43 mm相比，实测波束宽度在方位角和仰角分别为0.521 mm和0.482 mm。
The difficulties associated with fabrication and interconnection have limited the development of 2-D ultrasound transducer arrays with a large number of elements (>5000). In previous work, we described a 5 MHz center frequency PZT-P[VDF-TrFE] dual-layer transducer, which used 2 perpendicular 1-D arrays for 3-D rectilinear imaging. This design substantially reduces the channel count as well as fabrication complexity, which makes 3-D imaging more realizable. Higher frequencies (>5MHz) are more commonly used in clinical for imaging targets near transducers such as the breast, carotid, and musculoskeletal. In this paper, we present a 7.5 MHz dual-layer transducer array for 3-D rectilinear imaging. A modified acoustic stack model was designed and fabricated. PZT elements were sub-diced to eliminate lateral coupling. This sub-dicing process made the PZT into a 2–2 composite material, which could help improve transducer sensitivity and bandwidth. Full synthetic aperture 3-D data sets were acquired by interfacing the transducer with a Verasonics data acquisition system (VDAS). Offline 3-D beamforming was then performed to obtain volumes of a multi-wire phantom and a cyst phantom. The generalized coherence factor (GCF) was applied to improve the contrast of cyst images. The measured −6 dB fractional bandwidth of the transducer was 71% with a center frequency of 7.5 MHz. The measured lateral beamwidths were 0.521 mm and 0.482 mm in azimuth and elevation respectively, compared with a simulated beamwidth of 0.43 mm.
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DOI：
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