A self-reference PRF-shift MR thermometry method utilizing the phase gradient.

Area of Science:

• Medical Imaging
• Biophysics
• Physics

Background:

• Proton resonance frequency (PRF)-shift magnetic resonance (MR) imaging is a key method for accurate temperature measurement.
• Inter-scan motion and magnetic field shifts can compromise PRF-shift MR thermometry accuracy.
• Self-reference PRF-shift MR thermometry mitigates these issues by using a derived reference image.

Purpose of the Study:

• To present a new approach for calculating the baseline phase map in self-reference PRF-shift MR thermometry.
• To enhance the accuracy and reliability of MR-based temperature measurements.
• To address limitations of existing self-reference methods.

Main Methods:

• A novel method utilizing phase gradients to compute the baseline phase map.
• Elimination of the phase unwrapping step common in other self-reference methods.
• Validation through numerical simulations, phantom studies, and in vivo experiments.

Main Results:

• The proposed method effectively calculates the baseline phase map.
• Numerical simulations demonstrated accurate temperature distribution mapping.
• Experimental data from phantoms and in vivo studies confirmed the method's efficacy.

Conclusions:

• The novel phase gradient-based approach is a promising advancement in self-reference PRF-shift MR thermometry.
• This technique offers improved accuracy for MR-based temperature measurements.
• The method shows potential for reliable temperature monitoring in various applications.