Magnetic resonance imaging with lateralized arterial spin labeling

Area of Science:

• Medical Imaging
• Neuroscience
• Cardiovascular Science

Background:

• Accurate visualization of cerebral vasculature is crucial for diagnosing neurological conditions.
• Current MRI techniques may face challenges in differentiating blood supply from bilateral arteries.
• Selective arterial labeling can enhance the understanding of brain perfusion and vascular territories.

Purpose of the Study:

• To develop and validate a new MRI technique for independent labeling of right-sided and left-sided arteries.
• To assess the feasibility of this technique in normal volunteers using a clinical MRI system.
• To demonstrate the capability of spatially selective pulses in encoding and tracking arterial blood flow.

Main Methods:

• Development of a novel MRI sequence utilizing two spatially-selective adiabatic inversion pulses.
• Alternating labeling of right carotid/vertebral arteries and left carotid/vertebral arteries.
• Scanning of normal volunteers on a 1.5 T clinical MRI system and correlation with T2 anatomic images.

Main Results:

• The new MRI technique successfully achieved separate labeling of blood spins from right-sided and left-sided arteries.
• Arterial anatomy was clearly depicted, corresponding to the selective labeling scheme.
• Demonstrated the ability of spatially selective inversion pulses to encode spins at specific vascular origins and track their territories.

Conclusions:

• The developed MRI technique offers precise, separate labeling of bilateral carotid and vertebral arteries.
• This method allows for detailed visualization and analysis of arterial territories within the brain.
• Spatially selective inversion pulses are effective for encoding arterial spin origins and observing their run-off, advancing neurovascular imaging.