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Transcranial Shear-Mode Ultrasound Imaging: Characterization of Point Spread Function and Assessment of Excitation Techniques

机译:经颅剪切模式超声成像:点传播功能的表征和激励技术评估

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This study presents work on an imaging technique that utilizes shear-wave propagation through the skull. The pulse-echo Point Spread Functions (PSF) were obtained by imaging a point scatterer behind ex vivo human craniums at 1MHz. Brightness images of the target obtained with either shear-mode or conventional longitudinal-mode transmission in the bone were assessed to quantify distortions to the PSF. The signal-to-noise ratio (SNR) limitations introduced by severe attenuation of shear-waves in the skull were overcome with Frequency Modulated (FM) coded excitations.
机译:本研究提出了一种采用通过颅骨的剪切波传播的成像技术。通过在1MHz的前体内人颅后面的点散射器成像来获得脉冲回波点扩展功能(PSF)。评估用剪切模式或常规纵向模式传递中获得的目标的亮度图像被评估以量化对PSF的扭曲。通过频率调制(FM)编码激励克服颅骨中剪切波的严重衰减引入的信噪比(SNR)限制。

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