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Ultrasonic method and apparatus for measuring or detecting flow behavior of a non-sinusoidal periodicity

A technology of ultrasound and blood flow, applied in the field of medical ultrasound diagnostics, can solve the problems of a few harmonics and the inappropriate detection mechanism of sinusoidal periodicity

Active Publication Date: 2012-06-20
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This usually results in a few harmonics in the spectrum
Therefore, a sinusoidal periodicity detection mechanism is not suitable in such cases, and the pulsation index will be lower than when considering the non-sinusoidal nature of the periodicity

Method used

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  • Ultrasonic method and apparatus for measuring or detecting flow behavior of a non-sinusoidal periodicity

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Embodiment Construction

[0018] A pure sine function has no harmonics, and when analyzed in the frequency domain, it can be seen that only the fundamental frequency component is present. However, the usual cardiac blood flow pattern is not pure sinusoidal. This is because cardiac activity takes longer in diastole than in systole, which gives the blood flow pattern a non-sinusoidal character. When this feature is analyzed in the frequency domain, it appears as figure 1 The frequency peak shown is the spectrum of the band Doppler signal with the fundamental frequency component 10 at 1.64 Hz. The non-sinusoidal nature of the pulsatile activity makes the spectrum have several harmonics of the fundamental. In this example, the higher harmonics 12, 14, 16 and 18 are also visible up to about 8 Hz. In the following embodiments of the invention, the energy in a small frequency band around each fundamental and harmonic peak is compared to the total energy of the band Doppler signal during the evaluation of t...

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Abstract

A method and apparatus for automated detection of a general, non-sinusoidal type of periodicity in ultrasound Doppler signals from pulsatile blood flow is described. The method computes a pulsation index, which is a sum of the normalized powers of the fundamental and several harmonic components in the frequency spectrum of the banded Doppler signal. A weighting function may be applied to the power from each harmonic component in order to suppress contributions due to spurious peaks, as in the case when pulsatile flow is absent.

Description

technical field [0001] This application is a continuation-in-part of US Patent Application [IB2005 / 052938] filed September 8, 2005, the contents of which are hereby incorporated by reference. [0002] The present invention relates generally to the field of diagnostic medical ultrasound, and more particularly to methods and devices for measuring and / or detecting non-sinusoidal periodic blood flow using ultrasound. Background technique [0003] Early defibrillation is key to successful resuscitation of victims of cardiac arrest. The absence of a detectable patient heart pulse is a strong indication of cardiac arrest. Currently, defibrillation does not assess the patient's heartbeat or blood circulation, and the responder must manually check for a pulse, a process that is admittedly very subjective. Therefore, automatic assessment of pulsatile blood flow will be very important for automatic or manual defibrillators as well as in monitoring situations and other clinical applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B8/06
CPCA61B5/7207A61B5/021A61B8/08A61B8/543A61N1/3925A61B8/488A61B5/0402A61B8/06A61B5/318A61B8/5269
Inventor B·拉朱
Owner KONINK PHILIPS ELECTRONICS NV