Title :
A time-harmonic inverse methodology for the design of RF coils in MRI
Author :
Lawrence, Ben G. ; Crozier, Stuart ; Yau, Desmond D. ; Doddrell, David M.
Author_Institution :
Centre for Magnetic Resonance, Univ. of Queensland, Brisbane, Qld., Australia
Abstract :
An inverse methodology is described to assist in the design of radio-frequency (RF) coils for magnetic resonance imaging (MRI) applications. The time-harmonic electromagnetic Green´s functions are used to calculate current on the coil and shield cylinders that will generate a specified internal magnetic field. Stream function techniques and the method of moments are then used to implement this theoretical current density into an RF coil. A novel asymmetric coil operating for a 4.5 T MRI machine was designed and constructed using this methodology and the results are presented.
Keywords :
Green´s function methods; biomedical MRI; biomedical equipment; coils; current density; harmonics; inverse problems; method of moments; 4.5 T; RF coils design; Stream function techniques; asymmetric coil; current calculation; magnetic resonance imaging; medical diagnostic imaging; medical instrumentation; method of moments; shield cylinders; specified internal magnetic field; time harmonic; Coils; Design methodology; Electromagnetic fields; Electromagnetic shielding; Green´s function methods; Magnetic resonance imaging; Magnetic shielding; Moment methods; Radio frequency; Streaming media; Electromagnetic Fields; Equipment Design; Magnetic Resonance Imaging; Mathematics; Phantoms, Imaging; Radio Waves;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
