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Related Experiment Video

Updated: May 4, 2026

In vivo 19F MRI for Cell Tracking

In vivo 19F MRI for Cell Tracking

Published on: November 26, 2013

B1 transmit phase gradient coil for single-axis TRASE RF encoding.

Qunli Deng¹, Scott B King, Vyacheslav Volotovskyy

¹National Research Council of Canada, Calgary, Alberta, Canada T3G 1Z5.

Magnetic Resonance Imaging

|April 20, 2013

Summary

This summary is machine-generated.

Researchers designed an optimized Transmit Array Spatial Encoding (TRASE) MRI coil for a 0.2T system. This coil enables high-resolution imaging with a larger field of view using RF transmit phase gradients.

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Area of Science:

Magnetic Resonance Imaging (MRI)
Coil Design
RF Engineering

Background:

Transmit Array Spatial Encoding (TRASE) MRI utilizes RF transmit phase gradients for k-space traversal, crucial for high-resolution image formation.
Transmit coil performance significantly impacts TRASE image quality.

Purpose of the Study:

Design an optimized RF transmit phase gradient array for transverse spatial encoding in a 0.2T vertical B0 field MRI system.
Generate two transmit B1 RF fields with uniform amplitude and opposing linear phase gradients over the imaging volume using a single transmitter channel.

Main Methods:

A two-element coil array combining a double Maxwell-type and a Helmholtz-type coil was designed using 3D field simulations.
Phase gradient polarity was controlled by the relative phase of RF signals applied to the coil elements.

Main Results:

Field mapping and 1D TRASE imaging validated the coil's design and performance.
The optimized coil achieved a substantially larger imaging volume compared to non-optimized designs.

Conclusions:

The Maxwell (sine)-Helmholtz (cosine) coil configuration proved effective for generating a horizontal phase gradient.
This coil design approach shows promise for future phase-gradient coil development in MRI.