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SYSTEM AND METHOD FOR CONTINUOUS WAVE CONSTANT AMPLITUDE ON-RESONANCE AND OFF-RESONANCE SPIN-LOCK FOR MAGNETIC RESONANCE IMAGING
专利权人:
发明人:
Weitian CHEN,Baiyan JIANG
申请号:
US15663254
公开号:
US20180031661A1
申请日:
2017.07.28
申请国别(地区):
US
年份:
2018
代理人:
摘要:
MRI techniques provide robust imaging in the presence of inhomogeneity in the B1 (RF) and/or B0 magnetic fields. The techniques include using a magnetization prep sequence that includes an adiabatic half passage (AHP) followed by a spin-lock pulse, followed by a reverse AHP, after which a data acquisition sequence can be applied. The AHP and reverse AHP can have amplitude and frequency modulated to sweep through a region of frequency space. The RF amplitude of the AHP and reverse AHP can be designed to be equal to the spin-lock amplitude. Quantification of a magnetization relaxation parameter (e.g., T1rho) can use a modified relaxation model that accounts for relaxation effects during the reverse AHP. A dual-acquisition technique in which the reverse AHP of the second magnetization prep sequence has opposite frequency modulation to the reverse AHP of the first magnetization prep sequence can also be used.
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中国工程科技知识中心
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http://www.ckcest.cn/home/

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