Design Of Multidimensional Large Tip Angle Radiofrequency Pulses For Parallel Transmission In Magnetic Resonance Imaging
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Design Of Multidimensional Large Tip Angle Radiofrequency Pulses For Parallel Transmission In Magnetic Resonance Imaging
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Author :
language : en
Publisher:
Release Date : 2007
Design Of Multidimensional Large Tip Angle Radiofrequency Pulses For Parallel Transmission In Magnetic Resonance Imaging written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 2008
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Dissertations, Academic categories.
Design Of Radiofrequency Pulses For Parallel Transmit Systems At High Field Mri
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Author : Alessandro Sbrizzi
language : en
Publisher:
Release Date : 2009
Design Of Radiofrequency Pulses For Parallel Transmit Systems At High Field Mri written by Alessandro Sbrizzi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Applications Of Parallel Radiofrequency Transmission To Ultra High Field Magnetic Resonance Imaging
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Author : Yan Tong
language : en
Publisher:
Release Date : 2021
Applications Of Parallel Radiofrequency Transmission To Ultra High Field Magnetic Resonance Imaging written by Yan Tong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Rf Current Source Drive And Decoupling Technique For Parallel Transmit Arrays In Magnetic Resonance Imaging
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Author : Won-Je Lee
language : en
Publisher:
Release Date : 2008
Rf Current Source Drive And Decoupling Technique For Parallel Transmit Arrays In Magnetic Resonance Imaging written by Won-Je Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Investigation Of Optimal Radio Frequency Pulse Modulation Techniques For Variable Flip Angle Magnetic Resonance Imaging
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Author : Ajit Shantilal Shah
language : en
Publisher:
Release Date : 1988
Investigation Of Optimal Radio Frequency Pulse Modulation Techniques For Variable Flip Angle Magnetic Resonance Imaging written by Ajit Shantilal Shah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Radio Frequency Probes For Ultra High Field Magnetic Resonance Imaging
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Author : Daniel James Lee
language : en
Publisher:
Release Date : 2011
Radio Frequency Probes For Ultra High Field Magnetic Resonance Imaging written by Daniel James Lee 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.
This thesis describes the design, construction and testing of a dome coil. The dome coil is hemispherical in shape and is intended to be used within a set of hemispherical gradient coils in a seven tesla magnetic resonance imaging magnet. The dome coil has eight independent elements and is designed to be used for parallel transmission and reception. It is shown that the dome coil produces less specific absorption rate than a conventional birdcage coil and is suitable for head imaging. A study of travelling wave magnetic resonance imaging is also presented. In this study two different methods of generating a travelling wave (using a patch antenna and an end-fire helix antenna) are compared, and the power requirements and specific absorption rate of the travelling wave approach are considered. It is concluded that travelling wave magnetic resonance imaging is best performed using a local receive coil and with the travelling wave antenna placed at least 50 cm from the subject. All theory relevant to the design, construction, testing and use of these coils and antennas is also presented.
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.
Optimal Design Of Rf Pulses With Arbitrary Profiles In Magnetic Resonance Imaging
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Author :
language : en
Publisher:
Release Date : 2001
Optimal Design Of Rf Pulses With Arbitrary Profiles In Magnetic Resonance Imaging written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
The proper design of RF pulses in magnetic resonance imaging has a direct impact on the quality of acquired images. Several techniques have been proposed to obtain the RF pulse envelope given the desired slice profile. Unfortunately, these techniques do not take into account the limitations of practical implementation such as limited amplitude resolution. Moreover, implementing constraints for special RF pulses on most techniques is not possible. In this work, we propose an approach for designing optimal RF under theoretically any constraints. The new technique poses the RF pulse design problem as a combinatorial optimization problem and uses efficient techniques from this area to solve this problem. In particular, an objective function is proposed as the norm of the difference between the desired profile and the one obtained from solving the Bloch equations for the current RF pulse design values. Two global optimization techniques were implemented using genetic algorithms and simulated annealing. The results show a significant improvement over conventional design techniques and suggest the practicality of using of the new technique for clinical use.