Artifacts in T1ρ-weighted imaging: correction with a self-compensating spin-locking pulse
作者： Sridhar R. Charagundla , Arijitt Borthakur , John S. Leigh , Ravinder Reddy
DOI: 10.1016/S1090-7807(02)00197-0
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摘要: Abstract Significant artifacts arise in T 1 ρ -weighted imaging when nutation angles suffer small deviations from their expected values. These vary with spin-locking time and amplitude, severely limiting attempts to perform quantitative or measurement of relaxation times. A theoretical model explaining the origin these is presented context a -prepared fast spin-echo sequence. Experimentally obtained are compared those predicted by theory related B inhomogeneity. Finally, “self-compensating” preparatory pulse cluster presented, which second half phase-shifted 180°. Use this sequence maintains relatively uniform signal intensity despite large variations flip angle, greatly reducing imaging.
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