Nogueira-Barbosa Marcello H, Kamimura Hermes Arytto Salles, Braz Guilherme, Agnollitto Paulo M, Carneiro Antonio Adilton Oliveira
Radiology Division, Ribeirão Preto Medical School, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
Physics Department, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
Quant Imaging Med Surg. 2017 Oct;7(5):549-554. doi: 10.21037/qims.2017.09.05.
Vibro-acoustography (VA) uses two co-focused ultrasound beams with slightly different frequencies. The beams interact and generate a low-frequency focus to excite an object.
A two-element confocal ultrasound transducer with central frequency at 3.2 MHz was used to generate the low-frequency excitation (30 kHz) and the response of the bone to that excitation was acquired by a dedicated hydrophone. The face of the confocal transducer was positioned parallel to the surface of the bone at a focal length of 7 cm. The hydrophone was fixed to the side of the transducer, out of the path of the ultrasonic beam.
The resulting image clearly showed the bone fracture with resolution of 0.25 mm and high contrast with well-defined borders.
In this paper, we present preliminary results of VA imaging of bone surface and of bone fracture using an experimental set-up. Our results encourage future studies using VA to evaluate bone fractures.
振动声成像（VA）使用两个频率略有不同的共聚焦超声束。这些波束相互作用并产生一个低频焦点来激发物体。
使用一个中心频率为3.2MHz的二元共聚焦超声换能器来产生低频激励（30kHz），并通过专用水听器采集骨骼对该激励的响应。共聚焦换能器的表面与骨骼表面平行，焦距为7cm。水听器固定在换能器侧面，不在超声束路径上。
所得图像清晰显示了骨折情况，分辨率为0.25mm，对比度高，边界清晰。
在本文中，我们展示了使用实验装置对骨表面和骨折进行VA成像的初步结果。我们的结果鼓励未来使用VA评估骨折的研究。
