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首页> 外文会议>Pan American Health Care Exchanges Conference >Time-frequency analysis based on the scalogram technique of the 0-order ultrasonic X-waves assessing their viability as a detection tool in medical diagnosis
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Time-frequency analysis based on the scalogram technique of the 0-order ultrasonic X-waves assessing their viability as a detection tool in medical diagnosis

机译：基于0阶超声X波的缩放技术的时频分析评估其可存活率作为医学诊断中的检测工具

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摘要

In medical diagnosis by ultrasonic imaging, it is of vital importance to be able of collimating the emitted ultrasonic beams along all the patient field under analysis, if a good and maintained spatial resolution is desired, for instance for echographic purposes in tissues. An interesting future alternative, to the classical dynamic electronic focusing of ultrasonic beams, in large arrays, for scanning the patient field under study, would be the application in annular radiators of a recently proposed type of limited diffraction waves (LDW), the X-waves. The main objective of this paper is to analyze the time-frequency composition of some limited diffraction wave profiles obtained by means of performing a high-frequency ultrasonic transducer implementation of the 0-order solution of the ultrasonic X-waves. The well-know scalogram technique was employed in this work for achieving this analytical aim. The analysis was performed for four radial positions of the radiating ultrasonic transducer. Furthermore, the corresponding acoustic field, evaluated in dBs levels, is analyzed in detail. New X-wave characteristics are compared with the diffracted field at a fixed point, and over the same radial positions. The results obtained here show that the diffraction phenomenon reduces the wave content in high-frequencies, and modifies the phase of the wave, causing a delay in the diffracted 0-order X wave.
机译：在通过超声成像的医学诊断中，如果需要良好和维持的空间分辨率，能够在分析中沿着所有患者场准确地准直，因此能够沿着所有患者领域准确性至关重要。一个有趣的未来替代方案，在大阵列中，用于扫描研究中的患者场的超声波束的经典动态电子聚焦，将是最近提出的有限衍射波（LDW）的环形辐射器中的应用，X-波浪。本文的主要目的是通过执行超声X波的0阶换能器实现的高频超声换能器实现来分析一些受限衍射波轮廓的时频组成。在这项工作中采用了众所周知的缩放技术，以实现这种分析目标。对辐射超声换能器的四个径向位置进行了分析。此外，详细分析了在DBS水平中评估的相应声场。将新的X波特性与固定点处的衍射场进行比较，以及相同的径向位置。这里获得的结果表明，衍射现象在高频中降低了波含量，并改变波的相位，导致衍射0阶X波的延迟。

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