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KMID : 0858520060100020070
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Journal of the Korean Society of Magnetic Resonance in Medicine
2006 Volume.10 No. 2 p.70 ~ p.80
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A Unified Gradient Shape on the Slice-Selection Axis for Flow Compensation
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Jahng Geon-Ho
Stephen Pickup
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Abstract
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Spin echo gradient moment nulling pulse sequences were designed and implemented on a clinical magnetic resonance imaging system. A new technique was introduced for flow compensation that minimized echo time and effectively suppresses unwanted echoes on the slice selection gradient axis in spin echo sequences. A unified gradient shape was used in all orders of flow compensation up to the third order. A dual-purpose gradient was applied for flow compensation and to reduce unwanted artifacts. The sequences were used to generate images of phantoms and/or human brains. This technique was especially good at reducing eddy currents and artifacts related to imperfection of the refocusing pulse. The developed sequences were found to have shorter echo times and better flow compensation in through-plane flow than those of the previous models that were used by other investigators.
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KEYWORD
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spin-echo, slice selection gradient, flow compensation, unified gradient shape
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