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Doppler Imaging

A technology of Doppler imaging and Doppler strips, applied in the field of Doppler ultrasound, can solve the problems of reducing speckle and insufficiently increasing signal-to-noise ratio

Active Publication Date: 2017-02-15
SIEMENS MEDICAL SOLUTIONS USA INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These processes employ post-processing nonlinear filters, however, may not sufficiently increase the signal-to-noise ratio and / or reduce speckle

Method used

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Embodiment Construction

[0020] Image quality can be improved for Doppler imaging such as spectral Doppler imaging or color imaging. For signal-to-noise ratio improvement, the bandwidth is reduced beyond what is normally done in Doppler signal processing. Band limiting that is narrower than the frequency required by the user or system improves the signal-to-noise ratio. Since narrowing the frequency band can eliminate some signals of interest, the raw data is reprocessed (eg, to evaluate spectrum or velocity) multiple times at different narrow frequency bands to cover the entire spectrum. Multiple narrow frequency bands of spectral data are processed individually and stitched together to form a Doppler display. In another approach, the user or algorithm selects a narrower subset of frequencies for reprocessing to improve the signal-to-noise ratio.

[0021] For speckle reduction in imaging, excess bandwidth is used in sampling. Speckle is reduced by decimating the data into groups using the sampled ...

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Abstract

To reduce speckle is spectral Doppler imaging, any oversampling relative to the velocity scale is used to create different data sets for the location at a given time. The different data sets have at least partially independent noise. Spectra are estimated from the different data sets and the resulting spectra combined into a spectrum with less speckle. To improve signal-to-noise ratio, the samples acquired for a given velocity scale are band-limited into different narrower bands. The portion of the spectrum estimated for each narrow band has a higher signal-to-noise ratio than a spectrum estimated for the entire band. The parts of the spectrum estimated for the different narrow bands are stitched together to provide a spectrum for the entire band with greater signal-to-noise ratio. In another approach, the user may input a narrow band relative to the velocity scale so that the corresponding part of the spectrum is provided with greater signal-to-noise ratio. Similar approaches may be used for color or flow imaging.

Description

Background technique [0001] This embodiment relates to Doppler ultrasound, such as color flow (such as flow mode) imaging or Doppler mode (such as spectral) imaging. A Doppler response is generated in response to the received echo signal by transmitting multiple pulses, such as a pulse wave (PW) or a continuous wave (CW), at one or more locations. With spectral Doppler, the frequency spectrum of object motion or flow in a single spatial region is evaluated and displayed as a function of time. Spectral Doppler ultrasound imaging provides an image of the frequency spectrum as velocity values ​​(vertical axis) modulated by energy as a function of time (horizontal axis) of door position. This spectrum can be used to study fluid flow or tissue motion within a patient. [0002] Spectral Doppler in medical ultrasound is limited in sensitivity due to electrical and acoustic noise and the dynamic range of signal processing. On the difficulty of scanning a patient, the signal-to-nois...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/00G06T5/00
CPCA61B8/488A61B8/52G06T2207/30084G06T2207/10132G06T5/70A61B8/5269G01S7/52066G01S7/52077A61B8/5207A61B8/5253G06T11/006G06T2207/20182G06T2207/10036A61B8/461
Inventor P·D·弗赖伯格M·朴
Owner SIEMENS MEDICAL SOLUTIONS USA INC
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