Playground

Welcome to Playground MR0, a playground to share, vary and simulate MR sequences. MR sequences are written in the Pulseq standard using the pypulseq library. Pulseq files are simulated with the efficient Phase Distribution Graph Bloch simulation. Here we share links to example colabs that contain various MR sequences or let you upload your own seq file for simulation.

Many of the examples are build using PyPulseq and simulate the resulting .seq files with MR0. These .seq files could also be measured on any MRI scanner using a Pulseq interpreter.

Code and simulate PyPulseq

Notebook
Free Induction Decay	mr0_FID_seq.ipynb
Spin Echo CPMG	mr0_SE_CPMG_seq.ipynb
Stimulated Echo 3 pulses - 5 echoes	mr0_STE_3pulses_5echoes_seq.ipynb
FLASH 2D sequence	mr0_FLASH_2D_seq.ipynb
GRE EPI 2D sequence	mr0_EPI_2D_seq.ipynb
DWI SE EPI 2D sequence	mr0_DWI_SE_EPI.ipynb
Diffusion prepared STEAM	mr0_diffusion_prep_STEAM_2D_seq.ipynb
RARE 2D sequence	mr0_RARE_2D_seq.ipynb
TSE 2D sequence	mr0_TSE_2D_multi_shot_seq.ipynb
Interactive GRE to FLASH	mr0_GRE_to_FLASH.ipynb
balanced SSFP sequence	mr0_bSSFP_2D_seq.ipynb
DREAM STE for B0, B1, TxRx mapping	mr0_DREAM_STE_seq.ipynb
DREAM STID for B0, B1, TxRx mapping	mr0_DREAM_STID_seq.ipynb
Pulseq with RF shimming	pulseq_rf_shim.ipynb

Plot and simulate predifined .seq files

Notebook
Simulate pypulseq example sequences	mr0_pypulseq_exmpls_seq.ipynb
Simulate own uploaded seq files	mr0_upload_seq.ipynb

MR-zero optimization

Gradient descent optimizations using automatic differentiation by backpropagation. Some notebooks use pulseq-zero for optimizable sequence definitions with PyPulseq.

Notebook
IR FLASH 2D sequence for T1 mapping using a fit	mr0_opt_FLASH_2D_IR_Fit_T1.ipynb
IR FLASH 2D sequence for T1 mapping using a NN	mr0_opt_FLASH_2D_IR_voxelNN_T1.ipynb
FLASH flip angle opt. for PSF (with pulseq-zero)	Pulseq_zero_FLASH_FAopt_PSFtask.ipynb
TSE flip angle opt. for SAR (with pulseq-zero)	Pulseq_zero_TSE_FAopt_SARtask.ipynb
DESC with pulseq-zero	pulseq_zero_DESC_demo.ipynb

MR-double-zero optimization

Gradient-free optimization with nevergrad

Notebook
Ernst angle optimization	mr00_FLASH_2D_ernstAngle_opt.ipynb

MR plot wall of fame

famous historic plots recreated

MR0 example notebooks

The following sequences are examples of how to realize various tasks in MR-zero rather than demonstrations of specific MRI sequences.

Notebook
Pure MR0 FLASH	flash.ipynb
pulseq FLASH	pulseq_flash.ipynb
pulseq pTx FLASH	pulseq_sim_pTx.ipynb