Transmit/receive switch based on microstripline coupler
a technology of transmitting/receiving switch and coupler, which is applied in the direction of measuring device, magnetic measurement, instruments, etc., can solve the problems of space and efficiency problems, increase insertion loss, and reduce the power delivered to the rf coil
Active Publication Date: 2022-11-17
IMAM ABDULRAHRNAN BIN FAISAL UNIVERSITY
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Benefits of technology
The present disclosure describes a magnetic resonance imaging apparatus with a dual-tuned transmit / receive switch. This switch includes two concentric microstripline based hybrid couplers, which help to reduce insertion loss and improve power delivery to the RF coil. The technical effect of this invention is to improve the quality of magnetic resonance imaging by reducing the distance between the RF power amplifier and the RF coil, which leads to increased power delivered to the coil and lower noise levels. Additionally, the invention addresses the issue of long RF transmission line cables, which can increase insertion loss and reduce power delivery.
Problems solved by technology
Having long cables increases insertion loss and reduces a power delivered to the RF coils.
However, such solutions may reduce the insertion losses marginally but also introduces other issues such as space and efficiency issues.
US Patent Publication No. 2004 / 0266362A1 to Watkins et al. is in the field of a a transmit / receive (T / R) switch operating over a range of frequencies to implement a transmit / receive switch having a low loss path during the transmit mode and the receiver mode, however this T / R switch can just handle one resonant frequency and does not disclose a multi-tuning T / R switch.
US Patent Publication No. 2018 / 0083591A1 to Mandegaran is in the field of a RF duplexer including quadrature hybrid couplers and RF filters to enhance isolation in hybrid-based RF duplexers and multiplexers, however utilizing RF filters in MM scanners increases noise in circuitry which is undesirable.
Method used
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[0047]In the drawings, like reference numerals designate identical or corresponding parts throughout the several views. Further, as used herein, the words “a,”“an” and the like generally carry a meaning of “one or more,” unless stated otherwise.
[0048]Furthermore, the terms “approximately,”“approximate,”“about,” and similar terms generally refer to ranges that include the identified value within a margin of 20%, 10%, or preferably 5%, and any values there between.
[0049]Aspects of the present disclosure are directed to an MRI apparatus for magnetic resonance imaging of a subject of investigation.
[0050]Referring to FIG. 1A, a block diagram of an RF system 100 of an MRI apparatus, according to one embodiment. FIG. 1A illustrates an RF coil 102 controlled using a T / R switch 104. The RF coil 102 is an electrical component that is located within a magnet assembly of an MRI apparatus (not shown) and designed to be placed relatively close to a subject. The subject may be, for example, a huma...
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A magnetic resonance imaging apparatus includes a T / R switch. The T / R switch includes a double sided microstripline based hybrid couplers with a top side and a bottom side each including two concentric microstripline based hybrid couplers. Each of the two concentric microstripline based hybrid couplers includes an inner microstripline based hybrid coupler and an outer microstripline based hybrid coupler. The inner microstripline based hybrid coupler forms an inner loop of the two concentric microstripline based hybrid couplers and the outer microstripline based hybrid coupler forms an outer loop. In a transmission mode, the inner microstripline based hybrid coupler and the outer microstripline based hybrid coupler at the top side of the dual-tuned T / R switch are activated. In a receiving mode the inner microstripline based hybrid coupler and the outer microstripline based hybrid coupler at the top side and at the bottom side of the dual-tuned T / R switch are activated.
Description
STATEMENT OF PRIOR DISCLOSURE BY THE INVENTORS[0001]Aspects of the present disclosure are described in Ashraf Abuelhaija, Gameel Saleh, Tarik Baldawi, Sanaa Salama (12 Apr. 2021), Symmetrical and Asymmetrical Microstripline-based Transmit / Receive Switches for 7 Tesla Magnetic Resonance Imaging, Doi: 10.1002 / cta.3013. Further aspects of the present disclosure are described in Gameel Saleh, Ashraf Abuelhaija (21-24 Apr. 2021) Dual Tuned Switch for Dual Resonance 1H / 13C MM Coil, IEMTRONICS2021. Additionally, aspects of the present disclosure are described in Ashraf Abuelhaija and Gameel Saleh (February 2021). A Pi-Shaped Compact Dual Tuned 1H / 23Na Microstripline-Based Switch for 7-Tesla MM, Vol. 11, N. 1 ISSN 2039-5086. DOI: https: / / doi.org / 10.15866 / irecap.v11i1.20302. Also, aspects of the present disclosure are described in Ashraf Abuelhaija, Gameel Saleh, Tarik Baldawi, Sanaa Salama (August 2020), Symmetrical and Asymmetrical Microstripline-based Transmit / Receive Switches for 7 Tesla...
Claims
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IPC IPC(8): G01R33/36
CPCG01R33/3628G01R33/3642G01R33/3664G01R33/34007G01R33/3635
Inventor ABUELHAIJA, ASHRAFSALEH, GAMEEL SALEH MOHAMMED
Owner IMAM ABDULRAHRNAN BIN FAISAL UNIVERSITY