Patent ID: 11876549
Assignee: GE PRECISION HEALTHCARE LLC
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 6:
7. The system according to claim 5, wherein the resistance value determining module calculates the resistance value of the radio-frequency transmitting coil on the basis of the following equation:, ❘
    "\[LeftBracketingBar]"
   
   
    S
    ⁢
    11
   
   
    ❘
    "\[RightBracketingBar]"
   
  
  =
  
   
    
     
      ❘
      "\[LeftBracketingBar]"
     
     
      
       R
       
        e
        ⁢
        c
       
      
      -
      
       Z
       0
      
     
     
      ❘
      "\[RightBracketingBar]"
     
    
    
     
      ❘
      "\[LeftBracketingBar]"
     
     
      
       R
       
        e
        ⁢
        c
       
      
      +
      
       Z
       0
      
     
     
      ❘
      "\[RightBracketingBar]"
     
    
   
   ·
   
    
     ❘
     "\[LeftBracketingBar]"
    
    
     
      cos
      ⁡
      (
      
       atan
       ⁡
       (
       
        
         
          Z
          0
         
         
          
           R
           ec
          
          +
          
           Z
           0
          
         
        
        ⁢
        
         
          Q
          
           e
           ⁢
           c
          
         
         (
         
          
           
            ω
            a
           
           
            ω
            0
           
          
          -
          
           
            ω
            0
           
           
            ω
            a
           
          
         
         )
        
       
       )
      
      )
     
     
      cos
      ⁡
      (
      
       atan
       ⁡
       (
       
        
         
          Z
          0
         
         
          
           R
           ec
          
          -
          
           Z
           0
          
         
        
        ⁢
        
         
          Q
          
           e
           ⁢
           c
          
         
         (
         
          
           
            ω
            a
           
           
            ω
            0
           
          
          -
          
           
            ω
            0
           
           
            ω
            a
           
          
         
         )
        
       
       )
      
      )
     
    
    
     ❘
     "\[RightBracketingBar]"
    
   
  
 

the resistance value determining module calculates the parallel resistance value of the radio-frequency transmitting coil and the scanned object on the basis of the following equation:, ❘
     "\[LeftBracketingBar]"
    
    
     S
     ⁢
     11
    
    
     ❘
     "\[RightBracketingBar]"
    
   
   ′
  
  =
  
   
    
     
      ❘
      "\[LeftBracketingBar]"
     
     
      
       R
       el
      
      -
      
       Z
       0
      
     
     
      ❘
      "\[RightBracketingBar]"
     
    
    
     
      ❘
      "\[LeftBracketingBar]"
     
     
      
       R
       el
      
      +
      
       Z
       0
      
     
     
      ❘
      "\[RightBracketingBar]"
     
    
   
   ·
   
    
     ❘
     "\[LeftBracketingBar]"
    
    
     
      cos
      ⁡
      (
      
       atan
       ⁡
       (
       
        
         
          Z
          0
         
         
          
           R
           el
          
          +
          
           Z
           0
          
         
        
        ⁢
        
         
          Q
          el
         
         (
         
          
           
            ω
            b
           
           
            ω
            0
            ′
           
          
          -
          
           
            ω
            0
            ′
           
           
            ω
            b
           
          
         
         )
        
       
       )
      
      )
     
     
      cos
      ⁡
      (
      
       atan
       ⁡
       (
       
        
         
          Z
          0
         
         
          
           R
           el
          
          -
          
           Z
           0
          
         
        
        ⁢
        
         
          Q
          el
         
         (
         
          
           
            ω
            b
           
           
            ω
            0
            ′
           
          
          -
          
           
            ω
            0
            ′
           
           
            ω
            b
           
          
         
         )
        
       
       )
      
      )
     
    
    
     ❘
     "\[RightBracketingBar]"
    
   
  
 

wherein Rec is the resistance value of the radio-frequency transmitting coil, Rel is the parallel resistance value of the radio-frequency transmitting coil and the scanned object, |S11| is the first input reflection coefficient when an operating frequency of the radio-frequency transmitting coil is ωa, |S11′| is the second input reflection coefficient when the operating frequency of the radio-frequency transmitting coil is ωb, Z0 is the intrinsic impedance of the radio-frequency transmitting link, which is a known value, ω0, is a resonant frequency of the radio-frequency transmitting coil when having no load, ω′0 is a resonant frequency of the radio-frequency transmitting coil when having the scanned object, Qsc=RecCecω0, and Qel=RelCelω0, wherein Cec is an equivalent capacitance of the radio-frequency transmitting coil when having no load, and Cei is an equivalent parallel capacitance of the radio-frequency transmitting coil and the scanned object when the radio-frequency transmitting coil has the scanned object.