Automatic Design Tool For Robust Radio Frequency Decoupling Matrices In Magnetic Resonance Imaging

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Automatic Design Tool For Robust Radio Frequency Decoupling Matrices In Magnetic Resonance Imaging

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Author : Zohaib Mahmood
language : en
Publisher:
Release Date : 2015

Automatic Design Tool For Robust Radio Frequency Decoupling Matrices In Magnetic Resonance Imaging written by Zohaib Mahmood 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.

In this thesis we study the design of robust decoupling matrices for coupled transmit radio frequency arrays used in magnetic resonance imaging (MRI). In a coupled parallel transmit array, because of the coupling itself, the power delivered to a channel is typically partially re-distributed to other channels. This power must then be dissipated in circulators resulting into a significant reduction in the power efficiency of the overall system. In this thesis, we propose an automated approach to design a robust decoupling matrix interfaced between the RF amplifiers and the coils. The decoupling matrix is optimized to ensure all forward power is delivered to the load. The decoupling condition dictates that the admittance matrix seen by power amplifiers with 50 Ohms output impedance is a diagonal matrix with matching 1 (or 0.02 Siemens) at the diagonal. Our tool computes the values of the decoupling matrix via a non linear optimization and generate a physical realization using reactive elements such as inductors and capacitors. The methods presented in this thesis scale to any arbitrary number of channels and can be readily applied to other coupled systems such as antenna arrays. Furthermore our tool computes parameterized dynamical models and performs sensitivity analysis with respect to patient head-size and head-position for MRI coils.

Physics Briefs

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Author :
language : en
Publisher:
Release Date : 1981

Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Physics categories.

Science Abstracts

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Author :
language : en
Publisher:
Release Date : 1993

Science Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Electrical engineering categories.

Current Research In Britain

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Author :
language : en
Publisher:
Release Date : 1991

Current Research In Britain written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Engineering categories.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date :

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Aeronautics categories.

Catalogs Of Courses

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Author : University of California, Berkeley
language : en
Publisher:
Release Date : 1993

Catalogs Of Courses written by University of California, Berkeley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.

Includes general and summer catalogs issued between 1878/1879 and 1995/1997.

International Aerospace Abstracts

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Author :
language : en
Publisher:
Release Date : 1997

International Aerospace Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Aeronautics categories.

Government Reports Annual Index

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Author :
language : en
Publisher:
Release Date : 1981

Government Reports Annual Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Research categories.

Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.