Method and apparatus for positioning a Doppler ultrasound transducer for blood flow measurement and system for blood flow measurement
A Doppler ultrasound and blood flow measurement technology, which is applied in the field of blood flow measurement system, can solve problems such as errors and inaccurate transducers, and achieve the effect of improving the accuracy of positioning
Inactive Publication Date: 2015-11-25
KONINKLJIJKE PHILIPS NV
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Problems solved by technology
[0009] Therefore, on the one hand, simply determining whether the Doppler ultrasound signal is pulsed or not to determine whether the transducer is well placed may not be accurate enough and may introduce some errors
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[0038] Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.
[0039] figure 2 is a block diagram of an apparatus 20 for positioning a Doppler ultrasound transducer for blood flow measurement, according to an embodiment of the present invention.
[0040] refer to figure 2 , the device 20 comprises a first detector 21 for detecting a pressure oscillation signal from an inflatable cuff placed on the patient's artery.
[0041] In an embodiment, the first detector 21 processes the pressure signal obtained by the pressure sensor connected to the inflatable cuff to determine whether the pressure oscillation signal is detected, and if the pressure oscillation signal is not detected, then The operator will increase the pressure in the inflation cuff.
[0042] In operation, the cuff is first inflated to a suitable pressure, which need not be high enough to occlude the artery. The pressure is acceptable as l...
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The method of positioning a Doppler ultrasound transducer for performing blood flow measurement according to the invention comprises the steps of: detecting a pressure oscillation signal from an inflated cuff placed on patient's artery; detecting an ultrasound pulse signal from the Doppler ultrasound transducer placed along the artery; deriving a first signal from the pressure oscillation signal and the ultrasound pulse signal, the first signal indicating the degree of synchronization between the pressure oscillation signal and the ultrasound pulse signal; and outputting an indication signal to indicate the Doppler ultrasound transducer is in a desired position when the first signal satisfies a predefined condition. Since the synchronization property of the cuff pressure oscillation signal and the ultrasound signal caused by the blood flow is utilized to determine whether the transducer is well positioned or not, ultrasound signal, which is a pulse signal but not reflecting the blood flow of the artery, could be determined as not in synchronization with the oscillation signal and therefore the accuracy of the positioning could be improved.
Description
technical field [0001] The present invention relates to Doppler ultrasound, in particular to a method and apparatus for positioning a Doppler ultrasound transducer for blood flow measurement and a system for blood flow measurement. Background technique [0002] Doppler ultrasound is widely used in clinical applications to measure blood flow velocity. figure 1 Shows how Doppler ultrasound for measuring blood flow works. To perform blood pressure measurements, a cuff is provided around the patient's arm, and a balloon in the cuff is inflated to increase the pressure in the cuff. When the pressure increases to a predetermined level (above systolic pressure), the artery is blocked and the balloon is then slowly deflated. When the pressure in the balloon equals the systolic pressure, the artery is opened and blood flow is restored. When Doppler ultrasound 11 is applied to monitor the deflation procedure, it will detect the signal when the artery is opened. The corresponding p...
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IPC IPC(8): A61B5/022A61B8/06A61B8/08
Inventor M·闫Y·陈
Owner KONINKLJIJKE PHILIPS NV