Assessing cerebrovascular reactivity abnormality by comparison to a reference atlas

Area of Science:

• Neurology
• Medical Imaging
• Vascular Biology

Background:

• Assessing cerebrovascular reactivity (CVR) is crucial for understanding vascular pathophysiology.
• Subjective assessments and regional variations complicate CVR interpretation.
• Objective methods are needed to standardize CVR evaluation.

Purpose of the Study:

• To develop an objective scoring assessment for cerebrovascular reactivity (CVR) abnormalities.
• To create standardized CVR z-maps for improved diagnostic accuracy.

Main Methods:

• Cerebrovascular reactivity (CVR) was measured using blood-oxygen-level-dependent MRI signal change normalized by CO2 increase.
• A reference normal atlas was created from 46 healthy subjects' CVR maps.
• Patient CVR maps were normalized to the atlas space, generating voxel-specific z-scores to form CVR z-maps.

Main Results:

• CVR z-maps provided an objective evaluation of cerebrovascular reactivity abnormalities.
• The z-maps enhanced the appreciation of pathophysiology extent and distribution compared to standard CVR maps.
• Voxel-specific CVR comparisons between subjects and across sites were improved.

Conclusions:

• CVR z-maps offer an objective and improved method for evaluating cerebrovascular reactivity.
• This technique standardizes CVR assessment, reducing subjectivity and regional bias.
• CVR z-maps facilitate more accurate comparisons in clinical research and practice.