Improved magnetic resonance thermal imaging by combining proton resonance frequency shift (PRFS) and apparent...

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Thermal Therapy
• Medical Physics

Background:

• Effective cancer thermal therapy relies on accurate, real-time temperature monitoring within tumors.
• Proton resonance frequency shift (PRFS) MRI is a key technology for 3D temperature mapping during thermal therapies.
• PRFS-based temperature imaging is prone to magnetic field drift, compromising measurement accuracy.

Purpose of the Study:

• To develop and validate a novel method for correcting magnetic field drift in PRFS-based MR thermometry.
• To enhance the reliability and accuracy of temperature measurements for guiding cancer thermal therapy.

Main Methods:

• A new drift-correction technique was developed by alternating PRFS imaging with water apparent diffusion coefficient (ADC) imaging.
• This combined approach leverages the strengths of both PRFS (high resolution, low noise) and ADC (drift-free stability) imaging.
• The technique was successfully demonstrated and validated using phantom experiments.

Main Results:

• The proposed method yields drift-corrected thermal images with retained high resolution and low noise characteristics of PRFS imaging.
• The integration of ADC imaging provides inherent drift-free stability, compensating for PRFS magnetic field fluctuations.
• The technique shows potential for correcting motion-induced artifacts in PRFS thermometry.

Conclusions:

• Combining PRFS and ADC imaging offers a robust solution for accurate, drift-corrected MR thermometry in cancer therapy.
• This approach enhances the reliability of temperature monitoring, crucial for optimizing thermal treatment efficacy.
• The method holds promise for improving the precision and safety of image-guided thermal ablation therapies.