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Fast 3D radiofrequency field mapping using echo-planar imaging.

F Jiru¹, U Klose

¹Section of Experimental MR of the CNS, Department of Neuroradiology, University of Tuebingen, Tuebingen, Germany. fiji@medicon.cz

Magnetic Resonance in Medicine

|November 8, 2006

Summary

This study presents a fast 3D radiofrequency (RF) mapping method using simultaneous spin echo and stimulated echo acquisition with echo-planar imaging. This technique accurately quantifies RF field inhomogeneities in MRI and MRS, improving data reliability.

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Area of Science:

Magnetic Resonance Imaging (MRI)
Magnetic Resonance Spectroscopy (MRS)
Medical Physics

Background:

Inhomogeneous radiofrequency (RF) magnetic fields introduce significant errors in MRI and MRS quantification.
Accurate correction requires detailed knowledge of the 3D RF field distribution within the sample.

Purpose of the Study:

To develop and validate a rapid method for 3D RF mapping.
To enable precise correction of RF field inhomogeneities in 3D datasets.

Main Methods:

Simultaneous acquisition of spin echo (SE) and stimulated echo (STE) sequences using echo-planar imaging (EPI).
Acquisition of 3D RF maps with 64 partitions and a repetition time (TR) of 500 ms, completed in 1.5 minutes.
In vivo demonstration in the human brain at 3T.

Main Results:

The developed method allows for fast 3D RF mapping.
Calculated flip angles demonstrated high accuracy, with an error of approximately 2 degrees in the human brain.
Comparison with fitting methods and analysis of T(1) variations confirmed accuracy.

Conclusions:

The presented 3D RF mapping technique is fast and accurate.
This method effectively corrects for RF inhomogeneities in MRI and MRS.
It significantly enhances the reliability of quantitative imaging parameters in the human brain.