Free-Breathing Pediatric Chest MRI Performance of Self-Navigated Golden- Angle Ordered Conical Ultrashort Echo Time Acquisition

问题：

1. 为什么conical UTE 能diffuse motion & aliasing artifacts?
2. 4D flow chest MRI
3. self-navigation: the first few samples of each cone interleaf were processed to compute motion waveforms
4. UTE imaging: can image tissue with very short $T_2$

思考

UTE + 3D conical golden ratio trajectory

An optimal radial profile order based on the golden ratio for time-resolved MRI

3D radial 的缺点：填满 k-space 比较低效，导致在scan time和undersampling之间取舍

RF-spoiled gradient echo (SPGR) sequence + 3D conical k-space sampling trajectory + golden ratio permutation + self-navigation

Self- gated cardiac cine MRI.

3 different reconstruction results:

1. with all data
2. with 50% data

3. with soft-gating motion correction. coil-clustering, select highly correlated coils whose navigators most closely matched a dominant respiratory waveform

                          ***Robust self-navigated body MRI using dense coil arrays.***
   

parallel imaging + compressed sensing reconstruction using BART

4D flow acquisition

Comprehensive motion- compensated highly accelerated 4D flow MRI with ferumoxytol enhancement for pediatric congenital heart disease