Vibration mode imaging.
Vibration mode imaging.
复制标题
振动模式成像。
DOI：
10.1109/tmi.2007.895463
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发表时间：
2007
影响因子：
10.6
通讯作者：
Fatemi,Mostafa
中科院分区：
文献类型：
--
作者：
Zhang,Xiaoming;Zeraati,Mohammad;Kinnick,RandallR;Greenleaf,JamesF;Fatemi,Mostafa
研究了一种物体振动模态成像的新方法。超声波的辐射力是用来扫描物体的共振频率的对象。用激光测量物体的振动，用水听器测量物体产生的声发射。结果表明，被测信号与超声光束焦点处的模态振型值成正比。对机械心脏瓣膜和动脉幻像进行了实验研究。通过水听器测量得到阀上的模态图像，并进行有限元仿真验证。与传统的动脉幻影β扫描成像相比，模式成像不仅可以显示动脉与明胶的界面，还可以显示动脉的振动模式。在幻影表面上拍摄的图像表明，可以通过对身体表面的振动测量来获得内部动脉的图像。然而，如果直接测量动脉的振动，则可以改善动脉的图像。凝胶或组织结构的成像可以通过小气泡和造影剂增强。
A new method for imaging the vibration mode of an object is investigated. The radiation force of ultrasound is used to scan the object at a resonant frequency of the object. The vibration of the object is measured by laser and the resulting acoustic emission from the object is measured by a hydrophone. It is shown that the measured signal is proportional to the value of the mode shape at the focal point of the ultrasound beam. Experimental studies are carried out on a mechanical heart valve and arterial phantoms. The mode images on the valve are made by the hydrophone measurement and confirmed by finite-element method simulations. Compared with conventional beta-scan imaging on arterial phantoms, the mode imaging can show not only the interface of the artery and the gelatin, but also the vibration modes of the artery. The images taken on the phantom surface suggest that an image of an interior artery can be made by vibration measurements on the surface of the body. However, the image of the artery can be improved if the vibration of the artery is measured directly. Imaging of the structure in the gelatin or tissue can be enhanced by small bubbles and contrast agents.