| 摘要 |
The blood flow rate Q(t) is obtained from a first unit (300) measuring the speed V(t, z), z being the depth of examination, independent of the frequency of the ultrasonic wave used. In a similar manner a second measuring unit (500) enables the measurement of the radial speeds V1(t, z) and V2(t, z) of the shift of the two corresponding vessel walls, and thereafter, on account of two spatial integrations (606, 607) and time integrations (608, 609), the measurement of the instantaneous variation of the radius of the vessel DELTA r(t). The functions Q(t) and DELTA r(t) are thereafter displayed in several manners, for the purpose of comparison, for the duration of at least one cardiac cycle.
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