RACER‐GRASP: Respiratory‐weighted, aortic contrast enhancement‐guided and coil‐unstreaking golden‐angle radial sparse MRI

@article{Feng2018RACERGRASPRA,
  title={RACER‐GRASP: Respiratory‐weighted, aortic contrast enhancement‐guided and coil‐unstreaking golden‐angle radial sparse MRI},
  author={Li Feng and Chenchan Huang and Krishna P. Shanbhogue and Daniel K. Sodickson and Hersh Chandarana and Ricardo Otazo},
  journal={Magnetic Resonance in Medicine},
  year={2018},
  volume={80}
}
To develop and evaluate a novel dynamic contrast‐enhanced imaging technique called RACER‐GRASP (Respiratory‐weighted, Aortic Contrast Enhancement‐guided and coil‐unstReaking Golden‐angle RAdial Sparse Parallel) MRI that extends GRASP to include automatic contrast bolus timing, respiratory motion compensation, and coil‐weighted unstreaking for improved imaging performance in liver MRI. 

Magnetization‐prepared GRASP MRI for rapid 3D T1 mapping and fat/water‐separated T1 mapping

This study aimed to (i) develop Magnetization‐Prepared Golden‐angle RAdial Sparse Parallel (MP‐GRASP) MRI using a stack‐of‐stars trajectory for rapid free‐breathing T1 mapping and (ii) extend

GRASP‐Pro: imProving GRASP DCE‐MRI through self‐calibrating subspace‐modeling and contrast phase automation

To propose a highly accelerated, high‐resolution dynamic contrast‐enhanced MRI (DCE‐MRI) technique called GRASP‐Pro (golden‐angle radial sparse parallel imaging with imProved performance) through a

Free‐breathing dynamic contrast‐enhanced MRI for assessment of pulmonary lesions using golden‐angle radial sparse parallel imaging

Dynamic contrast‐enhanced magnetic resonance imaging (DCE‐MRI) has been shown to be a promising technique for assessing lung lesions. However, DCE‐MRI often suffers from motion artifacts and

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TLDR
MP-GRASP shows excellent repeatability of T1 estimation over time, and it is also robust to variation of different imaging parameters evaluated in this study.

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To develop a continuous‐acquisition cardiac self‐gated spiral pulse sequence and a respiratory motion‐compensated reconstruction strategy for free‐breathing cine imaging.

Rapid dynamic contrast‐enhanced MRI for small animals at 7T using 3D ultra‐short echo time and golden‐angle radial sparse parallel MRI

To develop a rapid dynamic contrast‐enhanced MRI method with high spatial and temporal resolution for small‐animal imaging at 7 Tesla.

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TLDR
To improve the quality of structural images and the quantification of ventilation in free‐breathing dynamic pulmonary MRI, a new approach is proposed that combines X-ray diffraction and electrophysiology for the first time.

Simultaneous Evaluation of Lung Anatomy and Ventilation Using 4D Respiratory‐Motion‐Resolved Ultrashort Echo Time Sparse MRI

TLDR
A method that can enable simultaneous examination of lung anatomy and ventilation is of clinical interest and CT/spirometry only provides global measures of lung ventilation.

Intraindividual Comparison of Compressed Sensing‐Accelerated Cartesian and Radial Arterial Phase Imaging of the Liver in an Experimental Tumor Model

TLDR
Both CS-VIBE and GRASP provide excellent results in dynamic liver MRI using extracellular and hepatocyte-specific contrast agents, in terms of IQ, peak signal intensity, and presence of artifacts.

References

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To develop a novel framework for free‐breathing MRI called XD‐GRASP, which sorts dynamic data into extra motion‐state dimensions using the self‐navigation properties of radial imaging and

Fast pediatric 3D free‐breathing abdominal dynamic contrast enhanced MRI with high spatiotemporal resolution

To develop a method for fast pediatric 3D free‐breathing abdominal dynamic contrast enhanced (DCE) magnetic resonance imaging (MRI) and investigate its clinical feasibility.

High‐temporospatial‐resolution dynamic contrast‐enhanced (DCE) wrist MRI with variable‐density pseudo‐random circular Cartesian undersampling (CIRCUS) acquisition: evaluation of perfusion in rheumatoid arthritis patients

TLDR
Highly accelerated 3D DCE wrist MRI with improved temporospatial resolution has been achieved in RA patients and provides accurate assessment of neovascularization and perfusion in RA joints, showing promise as a potential tool for evaluating treatment responses.

Free‐breathing pediatric MRI with nonrigid motion correction and acceleration

To develop and assess motion correction techniques for high‐resolution pediatric abdominal volumetric magnetic resonance images acquired free‐breathing with high scan efficiency.

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TLDR
A parameter-free method to automatically extract a bolus time curve from raw k-space data acquired with a radial stack-of-stars GRE sequence that can be used to display statistics about the CA bolus right after the scan, as well as to automatically pick time frames at important stages of perfusion.

Golden‐angle radial sparse parallel MRI: Combination of compressed sensing, parallel imaging, and golden‐angle radial sampling for fast and flexible dynamic volumetric MRI

To develop a fast and flexible free‐breathing dynamic volumetric MRI technique, iterative Golden‐angle RAdial Sparse Parallel MRI (iGRASP), that combines compressed sensing, parallel imaging, and

Robust self‐navigated body MRI using dense coil arrays

TLDR
To develop a robust motion estimation method for free‐breathing body MRI using dense coil arrays using dense Coil arrays, a large number of experiments have shown good results in both straight-line and sham MRI studies.

Respiratory Motion-Resolved Compressed Sensing Reconstruction of Free-Breathing Radial Acquisition for Dynamic Liver Magnetic Resonance Imaging

TLDR
Free-breathing motion-resolved XD-GRASP reconstructions provide diagnostic high-quality multiphase images in patients undergoing Gd-EOB-DTPA–enhanced liver examination, with higher score indicating more optimal examination.

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The proposed method for automatically excluding receiver coil elements which lead to streak artifacts is robust with respect to different experimental settings and fast to be included in the online reconstruction pipeline for real-time MRI.