80-MHz intravascular ultrasound transducer using PMN-PT free-standing film.
80-MHz intravascular ultrasound transducer using PMN-PT free-standing film.
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DOI：
10.1109/tuffc.2011.2085
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发表时间：
2011-11
期刊：
影响因子：
--
通讯作者：
Shung KK
中科院分区：
文献类型：
--
作者：
Li X;Wu W;Chung Y;Shih WY;Shih WH;Zhou Q;Shung KK
采用改进的前驱体涂层法制备了厚度为33 μm的[Pb（Mg_（1/3）Nb_（2/3））O_3]_（0.63）[PbTiO_3]_（0.37）（PMN-PT）自支撑薄膜，其压电性能与块体PMN-PT相当。在1 KHz下，介电常数和损耗分别为4，160和0.0291。剩余极化强度和矫顽场分别为28 μC/cm ~ 2和18.43 kV/cm。测得的机电耦合系数kt为0.55，这是接近的块体PMN-PT单晶材料。用该薄膜制作了一种高频（80 MHz）、高灵敏度的微型超声换能器。进行兔主动脉的体外成像，以证明该材料在80 MHz的血管内超声成像中的应用。与35 MHz超声图像相比，80 MHz图像显示出更高的上级分辨率和对比度。
[Pb(Mg1/3Nb2/3)O3]0.63[PbTiO3]0.37 (PMN-PT) free standing film of comparable piezoelectric property to bulk PMN-PT with a thickness of 33 μm has been fabricated using a modified precursor coating approach. At 1 KHz, the dielectric constant and loss were 4,160 and 0.0291, respectively. The remnant polarization and coercive field were 28 μC/cm2 and 18.43 kV/cm. The electromechanical coupling coefficient kt was measured to be 0.55, which was close to that of bulk PMN-PT single crystal material. A high frequency (80 MHz) miniature ultrasonic transducer with high sensitivity was fabricated from this film. In vitro imaging of a rabbit aorta was performed to demonstrate the application of this material to intravascular ultrasound imaging at 80 MHz. Compared to a 35 MHz ultrasonic image, the 80 MHz image showed superior resolution and contrast.