Simultaneous perfusion, diffusion, T₂ *, and T₁ mapping with MR fingerprinting

Area of Science:

• Neuroimaging
• Magnetic Resonance Imaging (MRI)
• Cerebrovascular Diseases

Background:

• Quantitative mapping of brain perfusion, diffusion, T2*, and T1 is crucial for cerebrovascular disease diagnosis.
• Current MRI techniques require separate sequences for each parameter, increasing scan time.

Purpose of the Study:

• To develop a novel MRI technique for simultaneous estimation of perfusion, diffusion, T2*, and T1 parameters.
• To reduce scan time and improve efficiency in multi-parametric brain mapping.

Main Methods:

• A modified magnetic resonance fingerprinting (MRF) sequence, based on MRF-arterial spin labeling (ASL), was developed.
• The sequence incorporated modified acquisition modules with varying echo times (TEs) and diffusion-weighting gradients.
• Quantitative values were compared against reference methods (MRF-ASL, DWI, T2* mapping), and test-retest repeatability was assessed.

Main Results:

• The novel method achieved a 24% reduction in scan time compared to separate sequences.
• Parametric maps demonstrated excellent image quality with strong correlations to reference methods.
• High reliability was observed for ADC, T2*, T1, and B1+ estimation (CoV <5%).
• The technique successfully detected both ischemic and hemorrhagic stroke in initial patient applications.

Conclusions:

• The proposed simultaneous multi-parametric mapping technique is a promising advancement in MRI.
• This method has significant potential for clinical application in stroke patients, offering efficient and comprehensive brain assessment.