Multiparametric Saturation Transfer MR Fingerprinting Using Rosette-Accelerated Readout

Area of Science:

• Biomedical Imaging
• Quantitative MRI
• Magnetic Resonance Fingerprinting

Background:

• Conventional quantitative MRI methods measure tissue parameters individually, which is inefficient for clinical applications.
• Magnetic Resonance Fingerprinting (MRF) enables simultaneous acquisition of multiple tissue properties, improving efficiency.

Purpose of the Study:

• To develop and validate a novel, multiparametric MRF framework for simultaneous quantitative measurement of bulk water, magnetization transfer (MT), myelin water fraction (MWF), B0 inhomogeneity (ΔB0), and susceptibility-weighted imaging (SWI) contrast.
• To integrate chemical exchange saturation transfer (CEST) imaging contrast within the MRF framework.

Main Methods:

• Developed a motion-robust, rosette-accelerated MRF sequence incorporating RF saturation and T2-preparation modules.
• Optimized MRF acquisition parameters and acquired data from healthy volunteers at 3T.
• Estimated quantitative tissue parameters from MRF signal evolutions and compared them with conventional standalone sequences.

Main Results:

• The multiparametric rosette-MRF technique achieved excellent agreement with reference parameters for bulk water, MT, MWF, SWI, and ΔB0.
• Higher MWF and semisolid macromolecular pool size ratio were observed in white matter compared to gray matter.
• Synthesized multimolecular contrast images (MTC, APT, rNOE, CEST) using Bloch equations and MRF-derived parameters.

Conclusions:

• The developed rosette-accelerated, multiparametric MRF technique enables efficient, simultaneous measurement of diverse MRI biomarkers.
• This approach holds potential for valuable insights into disease pathology and clinical evaluation of MRI biomarkers.
• Synthetic MRI analysis combined with MRF offers a powerful tool for rapid, comprehensive brain imaging.