Parallel Transmission

Parallel Transmission

Project Summary

Axial slice through the kidneys acquired at 7T using. Top: conventional method. Bottom: parallel transmission.In contrast to conventional MRI systems, parallel transmission utilizes multiple independently driven RF coils. Combined with a set of suitable gradient waveforms, this technique provides excellent control over the spin-dynamics. This technique accommodates three major applications:

    1. Spatially selective excitations, 

    2. Global & local SAR reduction,

    3. B1 & B0 artifact mitigation.

The first enables the operator to “zoom” in on an area of interest. The second application provides the radiologist with more flexibility when parameterizing the scan. In practice this could engender higher flip-angles to increase the signal-to-noise ratio, or accelerate the sequence. Finally, artifact mitigation is of particular interest in ultra high field MRI, where prevalent B1 and B0 artifacts impair clinical imaging.



Parallel transmission at NYU:

The main focus of this project lays on artifact mitigation and SAR management at 7Tesla. Although brain and extremity imaging is still feasible using conventional coil-designs, the contrast is often degraded by the B1 non-uniformity or strong susceptibility gradients. In the torso complete signal voids significantly impair general imaging applications. Using parallel transmission, we aim to develop the tools and equipment necessary to enable 7T whole body imaging devoid of artifacts.

Active research topics include:

B1-mapping, RF-pulse optimization, transmit-array design, SAR supervision, and high-performance computing.

Principal Investigator: 
Daniel Sodickson
Key Personnel: 
Martin Cloos, Cem Deniz, Graham Wiggins


Philanthropic Support

We gratefully acknowledge generous support for radiology research at NYU Langone Health from:
• The Big George Foundation
• Raymond and Beverly Sackler
• Bernard and Irene Schwartz

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