کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5407803 | 1393232 | 2006 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optimal control design of constant amplitude phase-modulated pulses: Application to calibration-free broadband excitation
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Optimal control design of constant amplitude phase-modulated pulses: Application to calibration-free broadband excitation Optimal control design of constant amplitude phase-modulated pulses: Application to calibration-free broadband excitation](/preview/png/5407803.png)
چکیده انگلیسی
An optimal control algorithm for generating purely phase-modulated pulses is derived. The methodology is applied to obtain broadband excitation with unprecedented tolerance to RF inhomogeneity. Design criteria were transformation of Iz â Ix over resonance offsets of ±25 kHz for constant RF amplitude anywhere in the range 10-20 kHz, with a pulse length of 1 ms. Simulations transform Iz to greater than 0.99 Ix over the targetted ranges of resonance offset and RF variability. Phase deviations in the final magnetization are less than 2-3° over almost the entire range, with sporadic deviations of 6-9° at a few offsets for the lowest RF (10 kHz) in the optimized range. Experimental performance of the new pulse is in excellent agreement with the simulations, and the robustness of the excitation pulse and a derived refocusing pulse are demonstrated by insertion into conventional HSQC and HMBC-type experiments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetic Resonance - Volume 179, Issue 2, April 2006, Pages 241-249
Journal: Journal of Magnetic Resonance - Volume 179, Issue 2, April 2006, Pages 241-249
نویسندگان
Thomas E. Skinner, Kyryl Kobzar, Burkhard Luy, M. Robin Bendall, Wolfgang Bermel, Navin Khaneja, Steffen J. Glaser,