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Doppler images of heterogeneous gel dosimeter phantom by multi-frequency vibration

机译：多频振动异质凝胶剂量计幽灵多普勒图像

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Vibrating biological tissue by external forces and investing of the induced micro-displacements of internal structures is a powerful technique to map relative mechanical properties within the medium. In general, pathological tissue has the stiffness modified. It implies that the range of resonance frequencies and the amplitudes of vibration of pathological tissues may differ from that of normal tissue. In this work, we propose a new apparatus to apply mechanical vibrations to the internal structure of soft tissue. It consists of a permanent magnet disc placed on the sample and a magnetized coil placed close to the magnet. Appling an alternating current in this coil, the oscillating magnetic field will vibrate the magnet. The vibration profile distribution of the internal structures is detected by ultrasound Doppler images. The contrast in the images of tissue-mimicking phantoms is strongly related with the frequency of vibration. The measurements were performed in a gel phantom containing a cylindrical inclusion two times stiffer than the background and in a dosimeter gel phantom containing a stiff inclusion created by ionizing radiation.
机译：通过外力振动生物组织和诱导的内部结构的微位移是一种强大的技术，用于映射介质内的相对机械性能。通常，病理组织具有改性刚度。它意味着谐振频率的范围和病理组织的振动幅度可能与正常组织的振动。在这项工作中，我们提出了一种新的装置，将机械振动应用于软组织的内部结构。它包括放置在样品上的永磁体和放置在靠近磁体上的磁化线圈组成。在该线圈中振荡交流电，振荡磁场将振动磁体。通过超声多普勒图像检测内部结构的振动曲线分布。组织模拟幻像图像中的对比度与振动的频率强烈相关。测量在含有比背景和通过电离辐射产生的刚性夹杂物的背部背景和剂量计凝胶幽灵中的圆柱夹杂物中的测量。

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