Name
Title | ||
|---|---|---|
High-Density MRI RF Arrays Using Mixed Dipole Antennas and Microstrip Transmission Line Resonators |
Abstract | ||
|---|---|---|
<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Objective:</i>
High-density multi-coil arrays are desirable in MRI because they provide high signal-to-noise ratios (SNR), enable highly accelerated parallel imaging, and provide more uniform transmit fields at high fields. For high-density arrays such as a head array with 16 elements in a row, popular dipole antennas and microstrip transmission line (also referred to as “MTL”) resonators both have severe coupling issues.
<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Methods:</i>
In this work, we show that dipoles and MTLs have naturally low coupling and propose a novel array configuration in which they are interleaved. We first show the electromagnetic (EM) coupling between a single dipole and a single MTL across different separations in bench tests. Then we validate and analyze this through EM simulations. Finally, we construct a 16-channel mixed dipole and MTL array and evaluate its performance on the bench and through MRI experiments.
<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Results:</i>
Without any decoupling treatments, the worst coupling between a dipole and an MTL was only −15.8 dB when their center-to-center distance was 4.7 cm (versus −5.4 dB for two dipole antennas and −6.0 dB for two MTL resonators). Even in a dense 16-channel mixed array, the inter-element isolation among all elements was better than −14 dB.
<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Conclusion:</i>
This study reveals, analyzes, and validates a novel finding that the popular dipole antennas and MTL resonators used in ultrahigh field MRI have naturally low coupling.
<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Significance:</i>
These findings will simplify the construction of high-density arrays, enable new applications, and benefit imaging performance in ultrahigh field MRI. |
Year | DOI | Venue |
|---|---|---|
2022 | 10.1109/TBME.2022.3166279 | IEEE Transactions on Biomedical Engineering |
Keywords | DocType | Volume |
Equipment Design,Magnetic Resonance Imaging,Phantoms, Imaging,Signal-To-Noise Ratio | Journal | 69 |
Issue | ISSN | Citations |
10 | 0018-9294 | 0 |
PageRank | References | Authors |
0.34 | 3 | 5 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Ming Lu | 1 | 0 | 0.34 |
| Saikat Sengupta | 2 | 0 | 0.34 |
| John C Gore | 3 | 616 | 41.36 |
| William A Grissom | 4 | 0 | 0.34 |
| Xinqiang Yan | 5 | 0 | 0.34 |