quantitative MR: output format

The output of each quantitative MR simulation is a .mat file that consists of the database with the simulated signals. Given that N different tissue types have been simulated and the MR signal has been sampled for T timepoints, the output of the simulation is in the following format:

  • experiments_lookuptable_corrected [N x T]: A matrix (database-like) where each row represents a different tissue type (as defined in the matrix spin_model). Each column represents the magnitude of the acquired, noise-free, simulated MR signal for a single time-point (as defined from the structure of the pulse sequence). 
  • experiments_lookuptable_corrected_real [N x T]: A matrix (database-like) where each row represents a different tissue type (as defined in the matrix spin_model). Each column represents the real part of the acquired, noise-free, simulated complex MR signal for a single time-point (as defined from the structure of the pulse sequence). 
  • experiments_lookuptable_corrected_imag [N x T]: A matrix (database-like) where each row represents a different tissue type (as defined in the matrix spin_model). Each column represents the imaginary part of the acquired, noise-free, simulated complex MR signal for a single timepoint (as defined from the structure of the pulse sequence). 
  • experiments_lookuptable_corrected_Mz [N x T]: A matrix (database-like) where each row represents a different tissue type (as defined in the matrix spin_model). Each column represents the z component of the noise-free magnetization recorded for a single time-point (as defined from the structure of the pulse sequence). 
  • spin_model [N x T]: A matrix that holds the spin model of the different tissue types. Each row represents a different tissue type. The first column holds the T1 value (in sec), the second column holds the T2 value (in sec) and the third column holds the off resonance of the spin from the Larmor frequency (in Hz). 
spin_model matrix (on the left) and format of the matrices that hold the simulated signals (on the right)
spin_model matrix (on the left) and format of the matrices that hold the simulated signals (on the right)

Tags: quantitative MR