ITEE Ph.D confirmation seminar: Bin Betty Xu, 12.00PM, Wed 04 Jun 2003

Electromagnetic Design of High Frequency Probes for Magnetic Resonance

Speaker: Bin Betty Xu, ITEE

When: 12.00PM, Wednesday 04 Jun 2003

Venue: 78-420

Host: Prof. Stuart Croizer

Abstract:

  As MRI moves to higher field strengths in search of improved
  resolution and signal-to-noise ratios, the size of RF coils relative
  to the wavelength of operation becomes larger. Current and past
  design procedures for RF coils, which have been quasi-static at
  lower frequencies, become inaccurate and full wave methods and the
  effect of the load must be used.

  The high magnetic fields (frequency) technology has brought
  considerable challenges in engineering in the form of ancillary
  hardware, e.g., the radio frequency (RF) resonator. And a number of
  so-called "high-field" MR systems operating at 3-4 T have been
  developed. In order to make the electromagnetic design of high
  frequency probes for magnetic resonance, analytical and numerical
  analysis of several RF coils has been made. Equivalent LC circuit
  method, MOM and FDTD have been used in the RF coils such as birdcage
  coils, TEM coils, Cavity coils, Recav coils, millipede coil, Spiral
  coil and some other designs of the RF coils.  The B1 fields with and
  without the load in the different frequencies have been
  analysed. Equivalent LC circuit method has good approximation for
  the simple geometry coils in low frequencies and in the high
  magnetic fields (frequency) technology, the numerical studies are
  performed based on a FDTD/MoM hybrid approach. The electromagnetic
  interactions between the resonator/load and field/load are all
  considered in the calculations. MoM is employed to evaluate the
  currents distribution of the coil and several other currents
  distribution analyses for the inverse method are produced. One
  element of the project aims to produce an automated, inverse design
  method for high frequency RF coils. Another aspect of the project is
  to implement and compare FDTD analyses and design methods with an
  optimal least squares Finite Element method.

  Future work for the PhD project will be concentrated on the current
  distribution analysis and inverse design method for high frequency
  RF coils, MOM/FDTD will be used to aid the design process.

Biography:

  Bin Betty Xu was born in 1974 and got her bachelor's and master's
  degrees of Electrical Engineering in Shandong University of
  China. She enrolled in The university of Queensland to pursue her
  PhD degree in April, 2002.

  Her PhD project is Electromagnetic Design of High Frequency Probes
  for Magnetic Resonance and her supervisor is Prof. Stuart Croizer.

Type:

Ph.D confirmation

Contact:

Prof. Stuart Croizer, seminar host (stuart@itee.uq.edu.au)
or Guido Governatori (ITEE seminar co-ordinator) (guido@itee.uq.edu.au)

ITEE seminar web page: http://www.itee.uq.edu.au/~seminar

[All seminars]