Patent ID: 11896416
Assignee: SUZHOU RAINMED MEDICAL TECHNOLOGY CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 6:
7. The method for calculating coronary artery fractional flow reserve based on myocardial blood flow and CT image according to claim 1, wherein step S07 specifically comprises:
solving three-dimensional grids of blood vessels, and solving a continuity and Navier-Stokes equations using numerical methods:

∇·{right arrow over (V)}=0  [A1], ρ
       ⁢
       
        
         ∂
         
          V
          →
         
        
        
         ∂
         t
        
       
      
      +
      
       ρ
       ⁢
       
        
         V
         →
        
        ·
        
         ∇
         
          V
          →
         
        
       
      
     
     =
     
      
       -
       
        ∇
         
        P
       
      
      +
      
       V
       ·
       
        μ
        ⁡
        (
        
         
          ∇
          
           V
           →
          
         
         +
         
          
           (
           
            ∇
            
             V
             →
            
           
           )
          
          T
         
        
        )
       
      
     
    
   
   
    
     [
     A2
     ]
    
   
  
 

wherein, {right arrow over (V)}, P, ρ, μ are flow velocity, pressure, blood flow density, blood flow viscosity, respectively;
an inlet boundary condition being: the inlet flow velocity V1 of the coronary stenosis vessel in the maximum hyperemia state;
calculating a pressure drop of each coronary artery stenosis through three-dimensional computational fluid dynamics to obtain ΔP1, ΔP2, ΔP3 . . . , calculating the pressure drop from the coronary artery inlet to the distal end of the coronary artery stenosis using ΔP=ΣΔPi (i=1, 2, 3 . . . ), and obtaining the mean intracoronary pressure Pd at the distal end of the stenosis using Pd=Pa−ΔP, wherein Pa is the mean aortic pressure.