A method of RF inhomogeneity correction in MR imaging

Area of Science:

• Medical Imaging
• Magnetic Resonance Imaging (MRI)
• Biophysics

Background:

• Radiofrequency (RF) inhomogeneity is a common artifact in MRI.
• This artifact degrades image quality and can affect diagnostic accuracy.
• Existing correction methods often require specialized hardware or complex acquisition protocols.

Purpose of the Study:

• To propose a direct postprocessing method for correcting RF inhomogeneity in MRI.
• To improve the accuracy and reliability of MR images without altering the acquisition process.
• To provide a computationally efficient solution for RF artifact reduction.

Main Methods:

• Acquisition of two MR images using different flip angles (theta and 2theta).
• Generation of spatial distribution maps for surface coil sensitivity and B1 field intensity using the acquired images.
• Postprocessing correction of the original MR image by dividing it with the generated distribution maps.

Main Results:

• Successfully generated spatial distribution maps for coil sensitivity and B1 field intensity.
• Demonstrated effective correction of RF inhomogeneity in MR images acquired with a gradient echo sequence.
• Presented a corrected MR image exhibiting improved uniformity.

Conclusions:

• The proposed direct postprocessing method offers an effective way to correct RF inhomogeneity in MRI.
• This technique enhances MR image quality by addressing artifacts without modifying imaging hardware or sequences.
• The method is practical for routine clinical application and research.