Multisection cerebral blood flow MR imaging with continuous arterial spin labeling

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Neuroimaging
• Physiology

Background:

• Continuous arterial spin labeling (CASL) is a noninvasive technique for measuring cerebral blood flow (CBF).
• Off-resonance saturation can introduce artifacts and inaccuracies in CASL imaging.
• Accurate CBF quantification is crucial for diagnosing and monitoring various neurological conditions.

Purpose of the Study:

• To evaluate a novel method for controlling off-resonance saturation in CASL MRI.
• To assess the effectiveness of the proposed method in both phantom and human studies.
• To enable multi-section CBF imaging at arbitrary angles to the labeling plane.

Main Methods:

• Application of amplitude-modulated radio-frequency (RF) irradiation during the acquisition of control images.
• Utilizing CASL MRI technique for CBF quantification.
• Testing the method in phantoms and human subjects.

Main Results:

• The amplitude-modulated RF irradiation effectively corrected for off-resonance saturation across the entire brain.
• The method enabled accurate CBF imaging in multiple sections.
• Imaging could be performed at arbitrary angles relative to the labeling plane, increasing flexibility.

Conclusions:

• The developed method provides robust correction for off-resonance saturation in CASL MRI.
• This technique enhances the accuracy and applicability of noninvasive CBF measurements.
• The findings facilitate improved neuroimaging for a range of clinical and research applications.