Patent ID: 11901081
Assignee: SUZHOU RAINMED MEDICAL TECHNOLOGY CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC G  A | IPC G

Claim 6:
7. The method for calculating an index of microcirculatory resistance 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:, ∇
      ·
      
       V
       →
      
     
     =
     0
    
   
   
    
     [
     A1
     ]
    
   
  
 

 
  
   
    
     
      
       
        ρ
        ⁢
        
         
          ∂
          
           V
           →
          
         
         
          ∂
          t
         
        
       
       +
       
        ρ
        ⁢
        
         
          V
          →
         
         ·
         
          ∇
          
           V
           →
          
         
        
       
      
      =
      
       
        -
        
         ∇
         P
        
       
       +
       
        ∇
        ·
        
         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 artery 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.