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Broadband blended fundamental and harmonic frequency ultrasonic diagnostic imaging

A technology of fundamental frequency and harmonic frequency, applied in the direction of acoustic wave diagnosis, ultrasonic/sonic wave/infrasonic wave diagnosis, infrasonic wave diagnosis, etc., can solve the problem of narrow filter, unfavorable fundamental wave signal limiting resolution, reducing unique characteristics and benefits, etc. question

Pending Publication Date: 2017-09-26
KONINKLJIJKE PHILIPS NV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the filtering necessary to separate the fundamental and harmonic frequencies creates an undesirable trade-off
In order to cleanly separate the signals into their two distinct bands, the bandwidth of the filters must be narrowly defined so that there is no band overlap, which especially disadvantageously limits the fundamental signal to a narrow band and the resulting limited resolution
Broadening the bands for wider-band imaging can cause the two bands to overlap and reduce the unique characteristics and benefits of each signal type

Method used

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  • Broadband blended fundamental and harmonic frequency ultrasonic diagnostic imaging
  • Broadband blended fundamental and harmonic frequency ultrasonic diagnostic imaging
  • Broadband blended fundamental and harmonic frequency ultrasonic diagnostic imaging

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Embodiment Construction

[0014] In accordance with the principles of the present invention, an ultrasonic diagnostic imaging system is described that enables clean separation of fundamental and harmonic signal components into distinct broadband signals. Double pulse transmission can be used, transmitting the same pulse twice in succession but differently modulated to each point in the image area. One example technique for doing this is called pulse inversion, where the same pulse is emitted with and without the pulse or polarity reversed. The transmit pulse has a wider bandwidth and a higher center frequency than those conventionally used in pulse inversion. Combining the received echo signals from the two transmissions on a spatial basis by both addition and subtraction results in two bands of frequency: a harmonic band and a fundamental band, in which The fundamental signal component has been eliminated, whereas in the fundamental band the fundamental frequency components from the two echoes reinfo...

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Abstract

An ultrasound system is described which produces blended fundamental and harmonic frequency images. Successively transmitted, differently modulated pulses are transmitted by an ultrasound probe and both fundamental and harmonic frequencies are received in response. The echo signals received from the two pulses are processed by pulse inversion, producing cleanly separated bands of fundamental and harmonic signals in which undesired components have been cancelled. Since the two bands have been separated by signal cancellation rather than filtering, the two bands are allowed to overlap, providing broadband signals in each band. The bands are filtered by bandpass filtering to define the fundamental and harmonic signals to be imaged. The signals are detected, and the detected signals are combined after weighting to produce a blended fundamental / harmonic image.

Description

[0001] This application claims the benefit of priority to US Application No. 62 / 109121, filed January 29, 2015, which is hereby incorporated by reference in its entirety. technical field [0002] The present invention relates to ultrasonic diagnostic imaging systems, and in particular to the use of hybrid fundamental and harmonic frequency ultrasound images. Background technique [0003] Harmonic imaging is used in ultrasound imaging to image ultrasound contrast agents and overcome reverberant clutter that can occur at the fundamental frequency. Although echo signals at higher harmonic frequencies will exhibit the attenuating effect of depth-dependent frequency attenuation, today's ultrasound systems are sensitive enough to largely overcome the attenuation at shallower depths in the body. The downside. This effect is prevalent only in tissue harmonic imaging, where near-field clutter from rib artifacts is avoided by a slower development of the harmonic signal components wit...

Claims

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Application Information

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IPC IPC(8): A61B8/00G01S7/52G01S15/89
CPCA61B8/4444A61B8/4483A61B8/488A61B8/52A61B8/5269G01S7/52025G01S7/52038G01S15/8954G01S15/8963G01S7/52095A61B8/4488
Inventor D·P·亚当斯S·W·迪亚尼斯
Owner KONINKLJIJKE PHILIPS NV
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