MR Angiography at 7T to Visualize Cerebrovascular Territories

Area of Science:

• Neuroimaging
• Vascular Neurology
• Medical Imaging

Background:

• Significant interindividual variability exists in the size and location of major cerebral artery vascular territories.
• Assessing this variability is crucial for advancing cerebrovascular research and patient care.
• Current noninvasive methods like Arterial Spin Labeling (ASL) require pre-defined territory selection.

Purpose of the Study:

• To develop and validate an alternative, noninvasive method for assessing brain vascular territories.
• To overcome the limitations of pre-acquisition territory definition inherent in ASL techniques.

Main Methods:

• Developed a novel simulation method based on virtual cerebrovascular dye injections.
• Utilized 7 Tesla Time-of-Flight (TOF) magnetic resonance angiography for high-resolution imaging.
• Generated a virtual arterial tree model and simulated dye dispersion following vessel segmentation and bias field normalization.

Main Results:

• The simulation method's results demonstrated consistency with established autoptic dye injection studies.
• Validated the accuracy of the novel simulation technique against historical anatomical data.

Conclusions:

• The developed simulation method provides a viable alternative for delineating cerebrovascular territories.
• Future technical advancements in imaging and segmentation will enhance accuracy for smaller vascular subtrees.