A Bore-Integrated Patch Antenna Array for Whole-Body Excitation in Ultra-High-Field Magnetic Resonance Imaging
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916308052869120 |
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| author | Egorova, Svetlana S. Lisachenko, Nikolai A. Kretov, Egor I. Glybovski, Stanislav B. Solomakha, Georgiy A. |
| author_facet | Egorova, Svetlana S. Lisachenko, Nikolai A. Kretov, Egor I. Glybovski, Stanislav B. Solomakha, Georgiy A. |
| contents | Objective: To develop and evaluate a bore-integrated patch antenna array designed for whole-body excitation in ultra-high-field (UHF) magnetic resonance imaging (MRI) with improved transmit efficiency and address the limitations of existing RF coil designs. Methods: The proposed patch antenna array utilizes the MRI bore's RF shield as a functional component to enhance the RF magnetic field ($B_1^+$) distribution. Numerical simulations were conducted to compare the performance of the patch antenna array to bore-integrated stripline and local dipole arrays. A decoupling structure was implemented to minimize coupling between adjacent patch antennas. The performance of the patch array was evaluated experimentally. Results: The proposed patch array provides 3.9 times higher averaged transmit (Tx) efficiency in the CP mode and 3.0 times higher for the phase shimming regime versus the bore-integrated stripline array. Conclusion: Compared to the stripline array, the bore-integrated patch antenna array offers significant improvements in Tx efficiency for whole-body UHF MRI. Significance: The findings support the feasibility of integrating arrays into the RF shield of MRI scanners. This could broaden the clinical use of UHF body MRI technology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_01189 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Bore-Integrated Patch Antenna Array for Whole-Body Excitation in Ultra-High-Field Magnetic Resonance Imaging Egorova, Svetlana S. Lisachenko, Nikolai A. Kretov, Egor I. Glybovski, Stanislav B. Solomakha, Georgiy A. Medical Physics Applied Physics Objective: To develop and evaluate a bore-integrated patch antenna array designed for whole-body excitation in ultra-high-field (UHF) magnetic resonance imaging (MRI) with improved transmit efficiency and address the limitations of existing RF coil designs. Methods: The proposed patch antenna array utilizes the MRI bore's RF shield as a functional component to enhance the RF magnetic field ($B_1^+$) distribution. Numerical simulations were conducted to compare the performance of the patch antenna array to bore-integrated stripline and local dipole arrays. A decoupling structure was implemented to minimize coupling between adjacent patch antennas. The performance of the patch array was evaluated experimentally. Results: The proposed patch array provides 3.9 times higher averaged transmit (Tx) efficiency in the CP mode and 3.0 times higher for the phase shimming regime versus the bore-integrated stripline array. Conclusion: Compared to the stripline array, the bore-integrated patch antenna array offers significant improvements in Tx efficiency for whole-body UHF MRI. Significance: The findings support the feasibility of integrating arrays into the RF shield of MRI scanners. This could broaden the clinical use of UHF body MRI technology. |
| title | A Bore-Integrated Patch Antenna Array for Whole-Body Excitation in Ultra-High-Field Magnetic Resonance Imaging |
| topic | Medical Physics Applied Physics |
| url | https://arxiv.org/abs/2407.01189 |