دورية أكاديمية
The coax monopole antenna:A flexible end-fed antenna for ultrahigh field transmit/receive arrays
| العنوان: | The coax monopole antenna:A flexible end-fed antenna for ultrahigh field transmit/receive arrays |
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| المؤلفون: | Budé, Lyanne M.I., Steensma, Bart R., Zivkovic, Irena, Raaijmakers, Alexander J.E. |
| المصدر: | Budé , L M I , Steensma , B R , Zivkovic , I & Raaijmakers , A J E 2024 , ' The coax monopole antenna : A flexible end-fed antenna for ultrahigh field transmit/receive arrays ' , Magnetic Resonance in Medicine , vol. 92 , no. 1 , pp. 361-373 . https://doi.org/10.1002/mrm.30036Test |
| سنة النشر: | 2024 |
| مصطلحات موضوعية: | Engineering, RF coil arrays, ultrahigh field MRI, Prostate/diagnostic imaging, Computer Simulation, Humans, Image Processing, Computer-Assisted/methods, Magnetic Resonance Imaging/instrumentation, Male, Phantoms, Imaging, Equipment Design |
| الوصف: | PURPOSE: The coax monopole antenna is presented for body imaging at 7 T. The antenna is fed at one end, eliminating the possibility of cable-coil coupling and simplifying cable routing. Additionally, its flexibility improves loading to the subject. METHODS: Like the coax dipole antenna, an interruption in the shield of the coaxial cable allows the current to extend to the outside of the shield, generating a B1 + field. Matching is achieved using a single inductor at the distal side, and a cable trap enforces the desired antenna length. Finite difference time domain simulations are employed to optimize the design parameters. Phantom measurements are conducted to determine the antenna's B1 + efficiency and to find the S-parameters in straight and bent positions. Eight-channel simulations and measurements are performed for prostate imaging. RESULTS: The optimal configuration is a length of 360 mm with a gap position of 40 mm. Simulation data show higher B1 + levels for the coax monopole (20% in the prostate), albeit with a 5% lower specific absorbance rate efficiency, compared to the fractionated dipole antenna. The S11 of the coax monopole exhibits remarkable robustness to loading changes. In vivo prostate imaging demonstrates B1 + levels of 10-14 μT with an input power of 8 × 800 W, which is comparable to the fractionated dipole antenna. High-quality images and acceptable coupling levels were achieved. CONCLUSION: The coax monopole is a novel, flexible antenna for body imaging at 7 T. Its simple design incorporates a single inductor at the distal side to achieve matching, and one-sided feeding greatly simplifies cable routing. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| العلاقة: | https://research.tue.nl/en/publications/8f69a771-e386-4b9d-9ced-1ca05df2fc54Test |
| DOI: | 10.1002/mrm.30036 |
| الإتاحة: | https://doi.org/10.1002/mrm.30036Test https://research.tue.nl/en/publications/8f69a771-e386-4b9d-9ced-1ca05df2fc54Test https://pure.tue.nl/ws/files/327128228/Magnetic_Resonance_in_Med_-_2024_-_Bud_-_The_coax_monopole_antenna_A_flexible_end_fed_antenna_for_ultrahigh_field.pdfTest http://www.scopus.com/inward/record.url?scp=85186203520&partnerID=8YFLogxKTest |
| حقوق: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.D0983E0B |
| قاعدة البيانات: | BASE |
| DOI: | 10.1002/mrm.30036 |
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