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首页> 外文会议>2010 Pan American Health Care Exchange (PAHCE 2010) >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X射线比例尺技术的时频分析评估其作为医学诊断工具的可行性

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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，至关重要的是，如果需要良好且保持的空间分辨率，例如为了组织中的回波检查目的，则能够使所分析的所有患者场上的超声束准直。对于大型阵列中的超声束的经典动态电子聚焦，以扫描正在研究的患者区域，一个有趣的未来替代方法是在环形辐射体中应用最近提出的有限衍射波（LDW），即X-波浪。本文的主要目的是分析通过执行超声X射线的0阶解的高频超声换能器实现而获得的一些有限衍射波轮廓的时频成分。这项工作采用了众所周知的比例尺技术来实现这一分析目的。对辐射超声换能器的四个径向位置进行了分析。此外，将详细分析以dBs级评估的相应声场。在相同的径向位置上，将新的X波特性与固定点处的衍射场进行比较。在此获得的结果表明，衍射现象降低了高频中的波含量，并且改变了波的相位，从而引起了衍射的0阶X波的延迟。

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