Development Of Multi Channel Radio Frequency Technology For Sodium And Potassium Magnetic Resonance Imaging At 7 0 Tesla Design And Clinical Application
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Development Of Multi Channel Radio Frequency Technology For Sodium And Potassium Magnetic Resonance Imaging At 7 0 Tesla Design And Clinical Application
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Author : Daniel Wenz
language : en
Publisher:
Release Date : 2020
Development Of Multi Channel Radio Frequency Technology For Sodium And Potassium Magnetic Resonance Imaging At 7 0 Tesla Design And Clinical Application written by Daniel Wenz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Design Of Multi Channel Radio Frequency Front End For 200mhz Parallel Magnetic Resonance Imaging
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Author : Xiaoqun Liu
language : en
Publisher:
Release Date : 2010
Design Of Multi Channel Radio Frequency Front End For 200mhz Parallel Magnetic Resonance Imaging written by Xiaoqun Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
The increasing demands for improving magnetic resonance imaging (MRI) quality, especially reducing the imaging time have been driving the channel number of parallel magnetic resonance imaging (Parallel MRI) to increase. When the channel number increases to 64 or even 128, the traditional method of stacking the same number of radio-frequency (RF) receivers with very low level of integration becomes expensive and cumbersome. However, the cost, size, power consumption of the Parallel MRI receivers can be dramatically reduced by designing a whole receiver front-end even multiple receiver front-ends on a single chip using CMOS technology, and multiplexing the output signal of each receiver front-end into one channel so that as much hardware resource can be shared by as many channels as possible, especially the digitizer. The main object of this research is focused on the analysis and design of fully integrated multi-channel RF receiver and multiplexing technology. First, different architectures of RF receiver and different multiplexing method are analyzed. After comparing the advantages and the disadvantages of these architectures, an architecture of receiver front-end which is most suitable for fully on-chip multi-channel design is proposed and a multiplexing method is selected. According to this proposed architecture, a four-channel receiver front-end was designed and fabricated using TSMC 0.18Bm technology on a single chip and methods of testing in the MRI system using parallel planar coil array and phase coil array respectively as target coils were presented. Each channel of the receiver front-end includes an ultra low noise amplifier (LNA), a quadrature image rejection down-converter, a buffer, and a low-pass filter (LPF) which also acts as a variable gain amplifier (VGA). The quadrature image rejection downconverter consists of a quadrature generator, a passive mixer with a transimpedance amplifier which converts the output current signal of the passive mixer into voltage signal while acts as a LPF, and a polyphase filter after the TIA. The receiver has an over NF of 0.935dB, variable gain from about 80dB to 90dB, power consumption of 30.8mW, and chip area of 6mm2. Next, a prototype of 4-channel RF receiver with Time Domain Multiplexing (TDM) on a single printed circuit board (PCB) was designed and bench-tested. Then Parallel MRI experiment was carried out and images were acquired using this prototype. The testing results verify the proposed concepts.
Design And Optimization Of A Cryogenic Radio Frequency Probe For Potassium 39 Magnetic Resonance Imaging At 9 4 Tesla
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Author : Ibrahim Ibrahim Ali Elabyad
language : en
Publisher:
Release Date : 2013
Design And Optimization Of A Cryogenic Radio Frequency Probe For Potassium 39 Magnetic Resonance Imaging At 9 4 Tesla written by Ibrahim Ibrahim Ali Elabyad and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Loop Radiofrequency Coils For Clinical Magnetic Resonance Imaging At 7 Tesla
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Author : Oliver Kraff
language : en
Publisher:
Release Date : 2011
Loop Radiofrequency Coils For Clinical Magnetic Resonance Imaging At 7 Tesla written by Oliver Kraff and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Design And Evaluation Of A 2d Tx Rx Rf Coil Array For Cardiovascular Magnetic Resonance Imaging At 7 Tesla
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Author : Christof Thalhammer
language : en
Publisher:
Release Date : 2010
Design And Evaluation Of A 2d Tx Rx Rf Coil Array For Cardiovascular Magnetic Resonance Imaging At 7 Tesla written by Christof Thalhammer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Development And Optimisation Of Radial Techniques For Sodium Magnetic Resonance Imaging
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Author : Sònia Nielles-Vallespin
language : en
Publisher:
Release Date : 2004
Development And Optimisation Of Radial Techniques For Sodium Magnetic Resonance Imaging written by Sònia Nielles-Vallespin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Design And Development Of A Radio Frequency Coil For Paediatric Magnetic Resonance Imaging
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Author : Gemma Rachael Cook
language : en
Publisher:
Release Date : 2015
Design And Development Of A Radio Frequency Coil For Paediatric Magnetic Resonance Imaging written by Gemma Rachael Cook and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Technology Of Nuclear Magnetic Resonance
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Author : Peter D. Esser
language : en
Publisher: Society of Nuclear Medicine, Incorporated
Release Date : 1984
Technology Of Nuclear Magnetic Resonance written by Peter D. Esser and has been published by Society of Nuclear Medicine, Incorporated this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Medical categories.
Development Of Rf Resonator Systems For Quantitative Sodium Mri Of The Kidney In Preclinical Studies At 9 4 Tesla And Whole Body Human Applications At 3 0 Tesla
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Author : Raffi Kalayciyan
language : en
Publisher:
Release Date : 2013
Development Of Rf Resonator Systems For Quantitative Sodium Mri Of The Kidney In Preclinical Studies At 9 4 Tesla And Whole Body Human Applications At 3 0 Tesla written by Raffi Kalayciyan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Rf Coil Design For Multi Frequency Magnetic Resonance Imaging And Spectroscopy
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Author : Arash Dabirzadeh
language : en
Publisher:
Release Date : 2010
Rf Coil Design For Multi Frequency Magnetic Resonance Imaging And Spectroscopy written by Arash Dabirzadeh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Magnetic Resonance Spectroscopy is known as a valuable diagnostic tool for physicians as well as a research tool for biochemists. In addition to hydrogen (which is the most abundant atom with nuclear magnetic resonance capability), other species (such as 31P or 13C) are used as well, to obtain certain information such as metabolite concentrations in neural or muscular tissues. However, this requires nuclear magnetic resonance (NMR) transmitter/receivers (coils) capable of operating at multiple frequencies, while maintaining a good performance at each frequency. The objective of this work is to discuss various design approaches used for second-nuclei RF (radio frequency) coils, and to analyze the performance of a particular design, which includes using inductor-capacitor (LC) trap circuits on a 31P coil. The method can be easily applied to other nuclei. The main advantage of this trapping method is the enabling design of second-nuclei coils that are insertable into standard proton coils, maintaining a near-optimum performance for both nuclei. This capability is particularly applicable as MRI field strengths increase and the use of specialized proton coils becomes more prevalent. A thorough performance analysis shows the benefit of this method over other designs, which usually impose a significant signal-to-noise (SNR) sacrifice on one of the nuclei. A methodology based on a modular coil configuration was implemented, which allowed for optimization of LC trap decoupling as well as performance analysis. The 31P coil was used in conjunction with various standard 1H coil configurations (surface/volume/array), using the trap design to overcome the coupling problem (degraded SNR performance) mentioned above. An analytical model was developed and guidelines on trap design were provided to help optimize sensitivity. The performance was analyzed with respect to the untrapped case, using RF bench measurements as well as data obtained from the NMR scanner. Insertability of this coil design was then verified by using it with general-purpose proton coils available. Phantoms were built to mimic the phosphorus content normally found in biologic tissues in order to verify applicability of this coil for in vivo studies. The contribution of this work lies in the quantification of general design parameters to enable "insertable" second-nuclei coils, in terms of the effects on SNR and resonance frequency of a given proton coil.