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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

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Published on: February 12, 2014

Highly-accelerated Bloch-Siegert |B1+| mapping using joint autocalibrated parallel image reconstruction.

Anuj Sharma¹, Sasidhar Tadanki, Marcin Jankiewicz

¹Vanderbilt University Institute of Imaging Science, Nashville, Tennessee, USA; Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee, USA.

Magnetic Resonance in Medicine

|July 3, 2013

Summary

This study presents a new method for fast Bloch-Siegert |B(1)(+)| mapping using highly accelerated data. The technique significantly reduces scan times for mapping transmit radiofrequency fields.

Keywords:

Bloch-Siegert acquisition auto-calibrated disjoint sampling image reconstruction parallel transmission

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Area of Science:

Magnetic Resonance Imaging (MRI)
Radiofrequency Engineering

Background:

Accurate Bloch-Siegert |B(1)(+)| field mapping is crucial for quantitative MRI.
Current methods often require long scan times, limiting their clinical applicability.
High acceleration factors are desirable to improve efficiency.

Purpose of the Study:

To develop and validate a method for reconstructing accurate Bloch-Siegert transmit radiofrequency (|B(1)(+)|) field maps from highly accelerated MRI data.
To enable faster acquisition of |B(1)(+)| maps for multichannel transmit arrays.

Main Methods:

A novel approach leverages unique phase shifts introduced by transmit coils and off-resonance frequencies.
Joint reconstruction of Bloch-Siegert images is performed using an augmented set of virtual receive coils.
The method is compatible with standard autocalibrated parallel imaging reconstruction techniques.

Main Results:

Simulations and phantom experiments demonstrated accurate |B(1)(+)| map reconstruction at high acceleration factors (up to 16x for Cartesian, 6x for spiral).
In vivo 7T experiments achieved high-quality maps at 32x (Cartesian) and 8x (spiral) accelerations.
Disjoint k-space sampling patterns improved reconstruction accuracy.

Conclusions:

The proposed method enables high acceleration factors for Bloch-Siegert |B(1)(+)| mapping.
This approach significantly reduces scan time, making |B(1)(+)| field mapping more feasible.
It facilitates efficient mapping of transmit array fields in MRI.