کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9587307 1393234 2005 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rapid determination of the RF pulse flip angle and spin-lattice relaxation time for materials imaging
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Rapid determination of the RF pulse flip angle and spin-lattice relaxation time for materials imaging
چکیده انگلیسی
For samples with T1s longer than 10 s, calibration of the RF probe and a measurement of T1 can be very time-consuming. A technique is proposed for use in imaging applications where one wishes to rapidly obtain information about the RF flip angle and sample T1 prior to imaging. The flip angle measurement time is less than 1 s for a single scan. Prior knowledge of the RF flip angle is not required for the measurement of T1. The resulting time savings in measuring the values of flip angle and T1 are particularly significant in the case of samples with very long T1 and short T2∗. An imaging extension of the technique provides RF flip angle mapping without the need for incrementing the pulse duration, i.e., RF mapping can be performed at fixed RF amplifier output.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetic Resonance - Volume 172, Issue 2, February 2005, Pages 231-237
نویسندگان
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