Patent ID: 11927659
Assignee: ZHEJIANG UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. The method for frequency drift correction of magnetic resonance CEST imaging according to claim 2, wherein the calculation formula of the value Δf of the main magnetic field frequency drift is:, Δ
   ⁢
   f
  
  =
  
   
    
     φ
     ¯
    
    
     odd
     -
     even
    
   
   
    2
    ⁢
    
     π
     ·
     Δ
    
    ⁢
    T
   
  
 

where ΔT is the sampling period of the free induction decay signals; φodd-even is the inter-line phase difference between the odd-numbered lines and the even-numbered lines, and the calculation formula is:, φ
    _
   
   
    odd
    -
    even
   
  
  =
  
   
    
     ∑
     
      i
      =
      1
     
     n
    
     
    
     
      φ
      
       odd
       -
       even
      
     
     ⁢
     i
    
   
   n
  
 

where φodd-eveni is a phase difference between an ith data sampling point of the odd-numbered lines and an ith data sampling point of the even-numbered lines, and n is a number of the sampling points in the even-numbered lines or the odd-numbered lines.