Plane-Wave Contrast Imaging: A Radiation Force Point of View
Plane-Wave Contrast Imaging: A Radiation Force Point of View
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DOI：
10.1109/tuffc.2018.2847899
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发表时间：
2018-12-01
影响因子：
3.6
通讯作者：
Tortoli, Piero
中科院分区：
文献类型：
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作者：
Blue, Lauchlin M.;Guidi, Francesco;Tortoli, Piero
已知辐射力产生微泡轴向位移，其量取决于发射突发频率、振幅和长度以及脉冲重复频率（PRF）。在标准聚焦成像模式中，每个微泡经历的实际PRF是低的，因为它是帧速率的量级（即，通常为几十赫兹）。然而，在平面波成像模式下，实际的PRF相当高，因为它相当于发射PRF（千赫兹范围）。此外，辐射压力预期在视场上几乎是均匀的，并且通常低于在聚焦发射（TX）模式中经历的峰值压力。我们已经实验研究了辐射力在平面波模式中的可能影响。在这里，我们报告的初步研究结果表明，声辐射力是微不足道的，只有在较低的TX水平。在较高的TX振幅，由于辐射力的气泡位移是可比的聚焦波在相同的PRF。此外，辐射力在视场上几乎是均匀的，并且随着TX突发中心频率接近尺寸隔离的微泡的共振频率而增加。
Radiation force is known to produce microbubble axial displacements by an amount that depends on the transmit burst frequency, amplitude, and length, as well as the pulse repetition frequency (PRF). In the standard focused-imaging mode, the actual PRF experienced by each microbubble is low, because it is of the order of the frame rate (i.e., usually tens of Hertz). In the plane-wave imaging mode, however, the actual PRF is considerably higher, as it is equivalent to the transmit PRF (kiloHertz range). Furthermore, the radiation pressure is expected to be almost uniform over the field of view, and typically lower than the peak pressure experienced in the focused transmit (TX) mode. We have experimentally investigated the possible effects of radiation force in the plane-wave mode. Here, we report on preliminary findings that show that the acoustic radiation force is negligible only at lower TX levels. At higher TX amplitudes, the bubble displacements due to radiation force are comparable to those obtained for focused waves at the same PRF. In addition, the radiation force is nearly uniform over the field of view and increases as the TX burst central frequency approaches the resonance frequency of size-isolated microbubbles.