Interpolation of Medical Ultrasound Images From Coherent and Noncoherent Signals
Interpolation of Medical Ultrasound Images From Coherent and Noncoherent Signals
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根据相干和非相干信号对医学超声图像进行插值
DOI：
10.1109/tim.2009.2015519
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发表时间：
2009
影响因子：
5.6
通讯作者：
M. Palmese
中科院分区：
文献类型：
--
作者：
A. Trucco;S. Curletto;M. Palmese
医学超声成像仪器通常使用在包络提取之后获取的信号来执行图像插值，即，非相干信号当满足空间采样的奈奎斯特条件时，该操作完全令人满意。然而，作为包络提取的结果，信号的最大空间频率增加，使得更难以满足奈奎斯特条件。为此，本文建议在包络提取之前对信号进行插值，即，相干数据的使用，并讨论该程序对实际超声扫描仪的适用性。重点是线阵成像技术，并通过有限的支持插值内核的加窗sinc函数进行评估。此外，作者还研究了相干信号也是欠采样的情况，并且完全不可能重建。调查进行了数值研究和模拟成像测试，它是由主观和客观的评价支持。它的结论是，在一个温和的欠采样水平，相干信号的插值允许显着更好的性能比非相干信号的插值。
Medical ultrasound imaging instrumentation typically performs image interpolation using the signals acquired after envelope extraction, i.e., noncoherent signals. This operation is completely satisfying when the Nyquist condition for spatial sampling is fulfilled. However, the maximum spatial frequency of a signal increases as a consequence of the envelope extraction, making it more difficult to fulfill the Nyquist condition. For this reason, this paper suggests the interpolation of signals before envelope extraction, i.e., the use of coherent data, and discusses the applicability of this procedure to actual ultrasound scanners. Emphasis is given to the linear-array imaging technique, and the adoption of windowed sinc functions as interpolation kernels with limited support is assessed. Moreover, the authors investigated the situation in which coherent signals are also undersampled, and perfect reconstruction is not at all possible. The investigation was carried out using a numerical study and a simulated imaging test, and it was supported by subjective and objective evaluations. It is concluded that, at a moderate undersampling level, the interpolation of coherent signals allows significantly better performance than the interpolation of noncoherent signals.