Fast dynamic contrast-enhanced lung MR imaging using k-t BLAST: a spatiotemporal perspective

Area of Science:

• Medical Imaging
• Pulmonary Perfusion
• Magnetic Resonance Imaging

Background:

• Dynamic contrast-enhanced (DCE) MRI is a non-ionizing radiation method for pulmonary perfusion imaging.
• Rapid image acquisition is crucial for accurate DCE lung imaging due to complex pulmonary vasculature.
• Existing methods face challenges in achieving high temporal resolution for dynamic perfusion assessment.

Purpose of the Study:

• To evaluate the feasibility of accelerating DCE lung imaging using the k-t broad-use linear acquisition speed-up technique (k-t BLAST).
• To assess the accuracy of accelerated imaging in quantifying pulmonary perfusion parameters.
• To validate the consistency of accelerated DCE lung imaging with fully sampled data in clinical populations.

Main Methods:

• Application of k-t BLAST technique to accelerate DCE lung imaging acquisition.
• Imaging performed on five healthy subjects and thirteen patients with various diseases.
• Comparison of accelerated datasets with fully sampled datasets to evaluate signal intensity and perfusion parameter accuracy.

Main Results:

• k-t BLAST accelerated DCE lung imaging by a factor of 5 with overall signal intensity errors <6% in healthy subjects and <10% in patients.
• Perfusion parameter estimates exhibited comparable or lower error rates than overall signal intensity.
• High consistency observed between accelerated and fully sampled datasets across all subjects.

Conclusions:

• k-t BLAST is a feasible technique for accelerating DCE lung imaging, maintaining diagnostic accuracy.
• The method shows potential for improving efficiency in clinical pulmonary perfusion assessments.
• This approach could be extended to other related DCE-MRI applications.