High-resolution multistation peripheral MR angiography using undersampled projection reconstruction imaging

Area of Science:

• Medical Imaging
• Radiology
• Cardiovascular Imaging

Background:

• Magnetic resonance angiography (MRA) is crucial for evaluating lower extremity vascular disease.
• Current MRA techniques can face challenges with artifact reduction and comprehensive coverage.
• Optimizing MRA protocols is essential for accurate diagnosis and treatment planning.

Purpose of the Study:

• To introduce and evaluate a novel three-station MR angiography protocol for the lower extremities.
• To assess the efficacy of time-resolved undersampled projection reconstruction (PR) and a spatial Fermi filter in reducing artifacts.
• To demonstrate the capability of the technique in providing high spatial resolution and broad coverage.

Main Methods:

• A three-station MRA protocol utilizing time-resolved undersampled projection reconstruction (PR) for the calf and non-time-resolved PR with bolus-chase for abdomen/thigh.
• Application of a spatial Fermi filter, leveraging peripheral vascular phased-array coil sensitivity, to mitigate streak artifacts from undersampled PR data.
• Sequential contrast injections for distinct imaging stations.

Main Results:

• The novel protocol successfully provided high spatial resolution across multiple lower extremity stations.
• The spatial Fermi filter effectively reduced streak artifacts inherent in undersampled PR data.
• The technique accurately depicted contrast dynamics, particularly in the distal lower extremities.

Conclusions:

• This novel three-station MRA protocol offers an effective solution for lower extremity vascular imaging.
• The combination of PR acquisition and Fermi filtering enhances image quality and diagnostic utility.
• The method provides comprehensive visualization of lower extremity vasculature and contrast dynamics.