Recent advances in 3D time-resolved contrast-enhanced MR angiography

Area of Science:

• Radiology
• Medical Imaging
• Cardiovascular Imaging

Background:

• Contrast-enhanced magnetic resonance angiography (CE-MRA) has been used clinically for approximately 20 years.
• Initial CE-MRA offered limited spatial resolution (3-4 mm) and longer acquisition times (around 30 seconds).

Purpose of the Study:

• To describe the technical advancements enabling improved spatial resolution and reduced acquisition times in CE-MRA.
• To highlight the development of high-resolution, 3D time-resolved CE-MRA studies.

Main Methods:

• Utilized improved gradient performance for reduced repetition times.
• Implemented advanced k-space sampling and reconstruction techniques.
• Incorporated parallel imaging, especially in two directions, and enhanced receiver coil arrays.

Main Results:

• Achieved significantly improved spatial resolution, with ~1 mm isotropic resolution now possible.
• Reduced acquisition frame times to several seconds.
• Enabled readily available high-resolution, time-resolved CE-MRA for many anatomical regions.

Conclusions:

• Technical innovations have transformed CE-MRA capabilities.
• Current CE-MRA technology supports high-resolution, time-resolved imaging for diverse clinical applications.