目的：评价自然组织谐波成像(nth I)对显示颈动脉粥样硬化斑块结构清晰度的影响。

Purpose: To assess the efficacy of native tissue harmonic imaging (NTHI) in the delineation of carotid plaque.

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目的评价自然组织谐波成像在肝癌诊断中的价值。

Objective To evaluate the role of Native Tissue Harmonic Imaging (NTHI) in the diagnosing of hepatic cancer.

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目的：研究自然组织谐波成像技术对超声图像的影响，旨在提高诊断率。

Objective:To investigate wather native tissue harmonic imaging(NTHI) can improve sonograph and increase diagnosis rate.

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