A dual-layer transducer array for 3-D rectilinear imaging.
A dual-layer transducer array for 3-D rectilinear imaging.
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DOI：
10.1109/tuffc.2009.1020
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发表时间：
2009-01
期刊：
影响因子：
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通讯作者：
Jeong JS
中科院分区：
文献类型：
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作者：
Yen JT;Seo CH;Awad SI;Jeong JS
用于3-D直线成像的2-D阵列需要非常大的元件数（16，000 - 65，000）。制造和互连具有大量元件（> 5，000）的2-D阵列的困难限制了用于3-D直线成像的合适换能器的开发。在本文中，我们提出了一种替代解决方案，这个问题，通过使用双层换能器阵列设计。该设计由两个垂直的一维阵列组成，用于换能器附近目标的临床三维成像。这些目标包括乳房、颈动脉和肌肉骨骼系统。这种换能器设计降低了制造复杂性和通道数，使得3-D直线成像更可实现。采用这种设计方法，仅用N个发射机和N个接收机就可以构成一个有效的N × N二维天线阵。例如，当N变得大于128时，该益处变得非常显著。为了证明可行性，我们构建了一个4 × 4 cm的原型双层阵列。发射阵列使用切割的PZT-5 H元件，并且接收阵列是单片未切割的P[VDF-TrFE]共聚物。接收元件由柔性互连电路上的铜迹线限定。测得的−6 dB分数带宽为80%，中心频率为4.8 MHz。在5 MHz时，PZT阵列和PVDF阵列的最近邻串扰分别为−30.4 ± 3.1 dB和−28.8 ± 3.7 dB。该双层换能器与Ultrasonix Sonix RP系统连接，并获得合成孔径3-D数据集。然后，我们进行离线3-D波束形成，以获得大量的尼龙线目标。理论横向波束宽度为0.52 mm，而在方位角和仰角上测得的波束宽度分别为0.65 mm和0.67 mm。还采集了直径为8 mm的无回声囊肿体模的3-D图像。
2-D arrays for 3-D rectilinear imaging require very large element counts (16,000–65,000). The difficulties in fabricating and interconnecting 2-D arrays with a large number of elements (>5,000) have limited the development of suitable transducers for 3-D rectilinear imaging. In this paper, we propose an alternative solution to this problem by using a dual-layer transducer array design. This design consists of two perpendicular 1-D arrays for clinical 3-D imaging of targets near the transducer. These targets include the breast, carotid artery, and musculoskeletal system. This transducer design reduces the fabrication complexity and the channel count making 3-D rectilinear imaging more realizable. With this design, an effective N × N 2-D array can be developed using only N transmitters and N receivers. This benefit becomes very significant when N becomes greater than 128, for example. To demonstrate feasibility, we constructed a 4 × 4 cm prototype dual-layer array. The transmit array uses diced PZT-5H elements, and the receive array is a single sheet of undiced P[VDF-TrFE] copolymer. The receive elements are defined by the copper traces on the flexible interconnect circuit. The measured −6 dB fractional bandwidth was 80% with a center frequency of 4.8 MHz. At 5 MHz, the nearest neighbor crosstalk of the PZT array and PVDF array was −30.4 ± 3.1 dB and −28.8 ± 3.7 dB respectively. This dual-layer transducer was interfaced with an Ultrasonix Sonix RP system, and a synthetic aperture 3-D data set was acquired. We then performed off-line 3-D beamforming to obtain volumes of nylon wire targets. The theoretical lateral beamwidth was 0.52 mm compared to measured beamwidths of 0.65 mm and 0.67 mm in azimuth and elevation respectively. 3-D images of an 8 mm diameter anechoic cyst phantom were also acquired.