Abstract #3291
Further Study of the Effects of a Time-Varying Gradient Fields on Phase Maps Theory and Experiments
Jiasheng Su 1 , Bingwen Zheng 2 , Sam Fong Yau Li 2 , and Shao Ying Huang 1
1
Singapore University of Technology and
Design, Singapore, Singapore,
2
Department
of Chemistry, National University of Singapore,
Singapore
The method of retrieving conductivities of human tissues
through eddy currents induced by pulsed field gradient
was proposed and has been studied intensively. In this
abstract, an optimized electromagnetic (EM) model is
proposed to study the relation among encoding gradient
fields, the induced eddy currents, and the resultant
phase difference that was used for the retrieval of
conductivity. It is further applied to study the
relationship of the gradient fields, the pulse sequence,
and the resultant phase difference. Besides the
discharging process when the gradient field is a
constant that was identified previously, another crucial
discharging process to generate phase difference is
identified. This discharging process offset the phase
difference generated by that when gradient field is
constant. It is terminated when an RF pulse is applied.
This process is critical for obtaining meaningful phase
maps for the retrievals of conductivity. Both
theoretical and experimental results are presented.
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