| 摘要 |
The invention relates to acquiring information concerning the physiological status of the brain by measuring and analysing variations of blood flow velocities and blood pressure within body parts or organs, in particular within the brain. Provided is a system for the analysis of arterial blood flow velocity measurements, comprising means for receiving input signals delivered by an arterial blood flow velocity (FV) sensor and by an arterial blood pressure (BP) sensor, wherein said FV and BP signals are recorded simultaneously and continuously, further comprising means for processing and outputting signals, wherein said processing comprises (i) normalizing said FV and BP signal with the minimal diastolic flow velocity or blood pressure set at 0 and the maximal systolic flow velocity or blood pressure set at 1; (ii) optionally synchronizing the normalized FV and the normalized BP signals at mid-upstroke; (iii) calculating the mean normalized FV and the mean normalized BP per time unit; and (iv) determining the ratio between the mean normalized FV signal and the mean normalized BP signal. Also provided is a method for determining pulsatile vascular resistance, and an apparatus for carrying out such a method.
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