Studies of Magnetic Resonance Imaging with Active Feedback RF Field

Abstract

Abstract:

Magnetic resonance imaging (MRI) now plays a significant role in clinical medical diagnosis. How to increase the image contrast has been of crucial importance in the field of MRI. Traditionally， contrast is generated by the differences in the magnetic resonance properties between different positions. However， when these differences are small， the desired contrast may not be achievable even if a long evolution time is used. Radiation damping is one of proposed approaches that may give a solution to this problem. Our previously published results indicate that radiation damping can induce a large contrast for small frequency differences even in a short period of time. Nevertheless， radiation damping requires a highly sensitive RF coil and must meet other conditions for it to be practically useful. The paper explains how to generate radiation damping by using a purposefully designed external circuit and how to control the spin dynamics so that the contrast is increased and a novel type of MRI is introduced.

Key words: MRI, spin dynamics, radiation damping, active feedback

CLC Number:

R445.2

HWANG Dennis W., LIN Yung-Ya, HwANG Lian-Pin. Studies of Magnetic Resonance Imaging with Active Feedback RF Field[J]. Chinese Journal of Magnetic Resonance, 2010, 27(3): 409-416.

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