A 5-MHz cylindrical dual-layer transducer array for 3-D transrectal ultrasound imaging.
A 5-MHz cylindrical dual-layer transducer array for 3-D transrectal ultrasound imaging.
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DOI：
10.1177/0161734612453279
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发表时间：
2012-07
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
二维经直肠超声(TRUS)正被用于指导前列腺活检和治疗。在许多情况下，TRUS探头被手动或机械地移动以获取体积信息，使得成像变得缓慢、依赖于用户并且不可靠。在这些过程中，实时三维TRUS系统可以提高成像的可靠性和容积率。在本文中，我们提出了一种5 MHz圆柱形双层换能器阵列，能够在不需要任何机械运动部件的情况下实时地进行三维经直肠超声。与全采样2-D阵列相比，这种设计大大减少了通道数和制造复杂度。这种双层换能器分别采用PZT元件作为发射元件，P[VDF-TrFE]共聚物元件作为接收元件。切丁PZT和共聚物的机械灵活性使其适用于经直肠应用。通过将换能器与Verasonics数据采集系统(VDAS)接口来获取全合成孔径三维数据集。然后进行离线3-D波束成形，以获得两个导线体模和一个囊性体模的体积。采用广义相干因子(GCF)提高图像对比度。该换能器的−6分贝分数带宽为62%，中心频率为5.6 6 MHz。测量的横向和纵向波束宽度分别为1.28 mm和0.91 mm，而模拟波束宽度分别为0.92 mm和0.74 mm。
2-D transrectal ultrasound (TRUS) is being used in guiding prostate biopsies and treatments. In many cases, the TRUS probes are moved manually or mechanically to acquire volumetric information, making the imaging slow, user-dependent and unreliable. A real-time 3-D TRUS system could improve reliability and volume rates of imaging during these procedures. In this paper, we present a 5 MHz cylindrical dual-layer transducer array capable of real-time 3-D transrectal ultrasound without any mechanically moving parts. Compared to fully-sampled 2-D arrays, this design substantially reduces the channel count and fabrication complexity. This dual-layer transducer uses PZT elements for transmit and P[VDF-TrFE] copolymer elements for receive, respectively. The mechanical flexibility of both diced PZT and copolymer makes it practical for transrectal applications. 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 two wire phantoms and a cyst phantom. Generalized coherence factor (GCF) was applied to improve the contrast of images. The measured −6 dB fractional bandwidth of the transducer was 62% with a center frequency of 5.66 MHz. The measured lateral beamwidths were 1.28 mm and 0.91 mm in transverse and longitudinal directions respectively, compared with a simulated beamwidth of 0.92 mm and 0.74 mm.
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DOI：
10.1016/j.urolonc.2011.02.014
发表时间：
2011-05
期刊：
Urologic oncology
影响因子：
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作者：
Natarajan S;Marks LS;Margolis DJ;Huang J;Macairan ML;Lieu P;Fenster A
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DOI：
10.1109/58.139123
发表时间：
1992-03-01
影响因子：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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