Patent ID: 11885840
Assignee: KOREA RESEARCH INSTITUTE OF STANDARDS AND SCIENCE
Field: Measurement (Instruments)
Classification: CPC G  A | IPC A  G

Claim 0:
1. A method of measuring a specific absorption rate (SAR) of a hip joint implant using magnetic resonance imaging (MRI), the method comprising:
arranging the hip joint implant in a human lower body-shaped phantom;
arranging an optical electric field sensor around the hip joint implant;
providing radio frequency (RF) energy according to an MRI sequence to the human phantom; and
calculating the SAR of the hip joint implant from strength of an electric field measured by the optical electric field sensor;
wherein the calculating of the SAR of the hip joint implant includes calculating Equation, SAR
    ⁡
    (
    
     
      r
      →
     
     ,
     t
     ,
     f
    
    )
   
   =
   
    
     
      σ
      ⁡
      (
      f
      )
     
     ×
     
      
       
        ❘
        "\[LeftBracketingBar]"
       
       
        
         E
         →
        
        (
        
         
          r
          →
         
         ,
         t
         ,
         f
        
        )
       
       
        ❘
        "\[RightBracketingBar]"
       
      
      2
     
    
    
     2
     ⁢
     ρ
    
   
  
  ,
 

where, σ denotes electrical conductivity of tissue, ρ denotes the bulk density, {right arrow over (E)} denotes a three-component electric field strength vector (x, y, z), {right arrow over (r)} denotes a three-component spatial position vector (x, y, z), f denotes an RF, and t denotes an elapsed time.