Patent ID: 11963818
Assignee: UNIVERSITA' DEGLI STUDI DI ROMA LA SAPIENZA
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 7:
8. A system for a measurement of haemodynamic indices, comprising:
a duplex ecograph scanner configured to acquire at least one ultrasound image of at least one segment of an arterial vessel and to measure a velocity a velocity of blood in the at least one segment and in at least one cardiac cycle;
at least one input device for allowing an operator to select at least one sample volume in the at least one ultrasound image acquired of the at least one segment within a time range of acquisition and/or of a time interval of interest in the at least one cardiac cycle;
characterized in that it further comprises:
a processor, or computer, configured for storage, display and processing of the at least one ultrasound image acquired and of the velocity of blood measured, said processing comprising the following operations:
extracting at least one time series indicating the blood velocity, or velocity signal, from the velocity of blood measured in said at least one sample volume and in the at least one cardiac cycle;
calculating, by means of the processor, a first area (Apre) equal to an area subtended by the velocity signal between a sample relating to an instant of systole start of said at least one cardiac cycle and a sample relating to an instant of systolic peak;
calculating, by means of the processor, a second area (Apost) subtended by the velocity signal between the sample relating to the instant of systolic peak of said at least one cardiac cycle and the sample relating to an instant of diastole end; and
calculating a current peripheral resistance index (CPRI) relationship between the second area (Apost) and the first area (Apre) according to the following formula:, C
   ⁢
   P
   ⁢
   R
   ⁢
   I
  
  =
  
   
    A
    post
   
   
    A
    
     p
     ⁢
     r
     ⁢
     e
    
   
  
 

wherein the at least one sample volume is at least one of inside a region of interest and downstream the region of interest; and
wherein the region of interest comprises at least one of a stent and a section involved in a surgical bypass revascularization.