System and method for continuous wave constant amplitude on-resonance and off-resonance spin-lock for magnetic resonance imaging

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United States of America Patent

PATENT NO 11137463
APP PUB NO 20180031661A1
SERIAL NO

15663254

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Abstract

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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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Patent Owner(s)

  • THE CHINESE UNIVERSITY OF HONG KONG

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Weitian Hong Kong SAR, CN 34 124
Jiang, Baiyan Jakarta, ID 2 2

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