Susceptibility-weighted imaging and quantitative susceptibility mapping in the brain

Area of Science:

• Medical Imaging
• Neuroimaging
• Biophysics

Background:

• Susceptibility-weighted imaging (SWI) is an MRI technique leveraging magnetic susceptibility differences for enhanced contrast.
• It combines magnitude and phase data from gradient echo sequences.
• SWI is sensitive to paramagnetic and diamagnetic substances, causing phase shifts in MRI data.

Purpose of the Study:

• To review the fundamental principles of SWI.
• To explore its clinical and research applications in neuroimaging.
• To discuss the mechanisms of brain susceptibility and practical implementation.

Main Methods:

• Utilizes gradient echo data, combining magnitude and phase information.
• Employs minimum intensity projection for high-resolution visualization of cerebral venous architecture.
• Sensitive to deoxygenated blood and intracranial mineral deposition.

Main Results:

• SWI provides high-resolution delineation of cerebral venous architecture, a unique feature among MRI techniques.
• It is highly effective in diagnosing various pathologies, including intracranial hemorrhage, TBI, stroke, neoplasms, and multiple sclerosis.
• SWI excels in detecting deoxygenated blood and intracranial mineral deposition.

Conclusions:

• SWI is a valuable MRI technique for visualizing venous structures and diagnosing diverse neurological conditions.
• Limitations in quantitative measurement are being addressed by emerging techniques like QSM and STI.
• Further development in quantitative susceptibility mapping promises more comprehensive analysis of brain tissue properties.