Pulse inversion sequences for mechanically scanned transducers
Pulse inversion sequences for mechanically scanned transducers
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DOI：
10.1109/tuffc.915
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发表时间：
2008-10-01
影响因子：
3.6
通讯作者：
van der Steen, Antonius F. W.
中科院分区：
文献类型：
--
作者：
Frijlink, Martijn E.;Goertz, David E.;van der Steen, Antonius F. W.
机械扫描换能器目前用于组织谐波成像（THI）和高频非线性微泡成像。脉冲反转 (PI) 技术广泛用于抑制基波信号，但其有效性会因组织/换能器的相对运动而降低。在本文中，我们研究了多脉冲反演（MPI）序列，该序列显着改进了机械扫描单元件传感器的基本抑制。随后将 MPI 应用于模拟和测量的 RF 数据，并将相对基波抑制与 2 脉冲 PI 技术进行比较。例如，模拟显示，对于脉冲间角为 0.15 度的旋转血管内超声换能器，分别组合 3 个和 7 个脉冲的 MPI 序列的基本抑制增加了 6 dB 和 10 dB。 MPI 序列最初应用于体内采集的 RF 数据导致了类似的基本抑制水平。所研究的 MPI 技术将有助于减少相对组织/换能器运动效应，并可能提高非线性组织成像的灵敏度和空间分辨率，并改进机械扫描换能器对比成像中的微泡检测。
Mechanically scanned transducers are currently used for tissue harmonic imaging (THI) and nonlinear microbubble imaging at high frequencies. The pulse inversion (PI) technique is widely used for suppressing the fundamental signal, but its effectiveness is reduced by relative tissue/transducer motion. In this paper, we investigate multipulse inversion (MPI) sequences that achieve a significant improvement oil the fundamental suppression for mechanically scanned single-element transducers. MPI was subsequently applied on simulated and measured RF-data and relative fundamental suppression was compared with the 2-pulse PI technique. Simulations showed, for example, an increased fundamental suppression of 6 and 10 dB for MPI-sequences that combined 3 and 7 pulses, respectively, for a rotating intravascular ultrasound transducer with an interpulse angle of 0.15 degrees. Initial application of MPI sequences on RF-data from in vivo acquisitions resulted in similar fundamental suppression levels. The investigated MPI technique will help to reduce relative tissue/transducer motion effects and might lead to improved sensitivity and spatial resolution in nonlinear tissue imaging and improved microbubble detection in contrast imaging for mechanically scanned transducers.