• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >3D FFT MODE FILTERING FOR PHASE GRADIENT VELOCITY MEASUREMENTS
【24h】

3D FFT MODE FILTERING FOR PHASE GRADIENT VELOCITY MEASUREMENTS

机译：用于相位梯度速度测量的3D FFT模式滤波

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The 3D FFT mode filter can be used recursively to isolate and reduce the effects of multiple modes in tissue motion. When the mode filter is unable to adequately isolate the propagating wave, the tissue boundary conditions can be adjusted to minimize vibrational displacements. The use of these analysis techniques will lead to the ability to measure the elastic properties in small and nonhomogeneous tissues. In this research, image processing techniques have been developed to accurately relate measured shear velocity to tissue elasticity. Accurate phase velocity measurements can be obtained by isolating propagating shear waves from other modes of motion such as reflected shear waves, refracted shear waves, vibrations and guided waves. The desired shear wave is isolated using a mode filter implemented with a Three Dimensional Fast Fourier Transform. The phase velocity of the isolated shear wave is measured using a phase gradient processing technique. The preliminary results indicate that: A specific mode of motion can be isolated from multiple modes and from noise Spectral symmetry can be used to extract the desired mode Phase Gradient processing algorithm is appropriate to use on isolated shear waves Mode filtering reduces deviation in phase velocity measurements The processing techniques provide physical intuition The shear wave velocity in small and nonhomogeneous tissues can be determined These results provide motivation for continuing to develop MRE and 3D FFT Mode Filtering as tools for noninvasively evaluating the mechanical properties of in vivo tissue.
机译：可以递归使用3D FFT模式滤波器来隔离和减少多种模式对组织运动的影响。当模式滤波器无法充分隔离传播波时，可以调整组织边界条件以最小化振动位移。这些分析技术的使用将导致能够测量小的非均质组织中的弹性。在这项研究中，已经开发了图像处理技术以将测得的剪切速度与组织弹性精确相关。通过将传播的剪切波与其他运动模式（例如反射剪切波，折射剪切波，振动和导波）隔离开，可以获得准确的相速度测量结果。使用通过三维快速傅立叶变换实现的模式滤波器隔离所需的剪切波。使用相位梯度处理技术测量隔离剪切波的相速度。初步结果表明：可以将特定的运动模式与多种模式和噪声隔离开可以使用频谱对称性提取所需的模式。相位梯度处理算法适用于隔离剪切波。模式滤波可以减少相速度测量中的偏差。该处理技术提供了物理直觉。可以确定小型和非均质组织中的剪切波速度。这些结果为继续开发MRE和3D FFT模式过滤提供了动力，从而可以无创地评估体内组织的机械性能。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号