Semi-quantitative CBF and CBF ratios obtained using perfusion-weighted MR imaging

Area of Science:

• Neurology
• Radiology
• Medical Imaging

Background:

• Cerebral blood flow (CBF) is crucial for brain health.
• Assessing CBF changes is vital in cerebrovascular disease diagnosis and management.
• Perfusion-weighted MR imaging (PWI) offers a semi-quantitative approach to CBF measurement.

Purpose of the Study:

• To evaluate the utility of semi-quantitative CBF measurements using PWI.
• To compare PWI-derived semi-quantitative CBF with quantitative CBF obtained via Positron Emission Tomography (PET).
• To assess the correlation between PWI and PET in patients with unilateral cerebral artery occlusion.

Main Methods:

• A comparative study involving 10 patients with chronic occlusive cerebrovascular disease.
• Semi-quantitative CBF measurements were performed using PWI.
• Quantitative CBF measurements were obtained using PET.
• CBF values and ratios (affected vs. contralateral side) were analyzed.

Main Results:

• No statistically significant correlation was found between absolute semi-quantitative CBF values from PWI and quantitative CBF from PET.
• A statistically significant positive correlation (p < 0.01) was observed between the CBF ratios of the affected to unaffected side derived from PWI (0.94 ± 0.22) and PET (0.88 ± 0.19).
• The CBF ratio, not the absolute semi-quantitative CBF, demonstrated potential in detecting CBF alterations.

Conclusions:

• Semi-quantitative CBF by PWI does not directly correlate with quantitative PET-CBF.
• The CBF ratio derived from PWI is a reliable indicator for detecting changes in cerebral blood flow in cerebrovascular disease.
• PWI-derived CBF ratios may serve as a valuable tool for monitoring patients with unilateral cerebral artery occlusion.