Gain setting in doppler haemodynamic monitors
First Claim
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1. ) A method of automatically setting signal gain in a Doppler ultrasound haemodynamic monitor, said method including the steps of:
- assessing the strength of components of the blood velocity spectrum to identify a group of velocity components above a predetermined level occupying a band within the velocity spectrum; and
adjusting the gain setting so that the perceived width of said band falls within predetermined limits.
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Abstract
This invention relates to a method of automatically setting the gain of an echo signal in a Doppler ultrasound haemodynamic monitor. In essence the invention comprises monitoring the strength of velocity components measured by the apparatus, and identifying a group of such components occupying a particular band within the overall velocity spectrum. The signal gain is then adjusted so that the perceived with of the band falls within predetermined limits. The monitoring or assessment of the velocity components is preferably undertaken when the overall flow velocity is high e.g. during systole.
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Citations
12 Claims
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1. ) A method of automatically setting signal gain in a Doppler ultrasound haemodynamic monitor, said method including the steps of:
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assessing the strength of components of the blood velocity spectrum to identify a group of velocity components above a predetermined level occupying a band within the velocity spectrum; and
adjusting the gain setting so that the perceived width of said band falls within predetermined limits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12)
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10. ) A method of automatically setting signal gain in a Doppler ultrasound haemodynamic monitor, said method including the steps of:
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establishing a base gain value; and
automatically adjusting the received signal gain in real time to bring the same within a band defined about said base gain value.
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Specification