Comparison of Xe-CT/CBF and quantitative ECD-SPECT

Area of Science:

• Neuroimaging
• Radiology
• Cerebrovascular Medicine

Background:

• Cerebral blood flow (CBF) is a critical indicator of brain health.
• Accurate measurement of CBF is essential for diagnosing and managing cerebrovascular diseases.
• Comparing different imaging modalities for CBF assessment is crucial for clinical practice.

Purpose of the Study:

• To compare the cerebral blood flow (CBF) values obtained from stable xenon enhanced X-ray computed tomography (Xe-CT) and Technetium-99m ethylsteinate dimer single-photon emission computed tomography (ECD-SPECT).
• To evaluate the agreement and correlation of CBF measurements between Xe-CT and ECD-SPECT across different cerebral territories and the thalamus.

Main Methods:

• A comparative study involving 12 patients.
• Assessment of CBF using stable xenon enhanced X-ray computed tomography (Xe-CT).
• Assessment of CBF using Technetium-99m ethylsteinate dimer single-photon emission computed tomography (ECD-SPECT).
• Analysis of CBF values in the anterior, middle, and posterior cerebral artery territories, and the thalamus.

Main Results:

• ECD-SPECT generally yielded higher CBF values compared to Xe-CT across most evaluated regions.
• Significant discrepancies were observed, with the thalamus showing no correlation between the two methods.
• The posterior cerebral artery territory exhibited a lower correlation in CBF measurements between ECD-SPECT and Xe-CT.

Conclusions:

• There are notable differences in CBF measurements between Xe-CT and ECD-SPECT, particularly in specific brain regions like the thalamus and posterior cerebral artery territory.
• The varying results suggest that these two imaging modalities may reflect different aspects of cerebral perfusion or have different sensitivities.
• Further investigation is warranted to understand the underlying reasons for these discrepancies and their clinical implications.