Exploring the limits of broadband excitation and inversion: II. Rf-power optimized pulses
| Autor: | Thomas E. Skinner, Steffen J. Glaser, Burkhard Luy, Navin Khaneja, Kyryl Kobzar |
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| Rok vydání: | 2008 |
| Předmět: |
Physics
Nuclear and High Energy Physics Magnetic Resonance Spectroscopy business.industry RF power amplifier Bandwidth (signal processing) Biophysics Reproducibility of Results Pulse duration Signal Processing Computer-Assisted Inversion (meteorology) Broadband excitation Condensed Matter Physics Optimal control Sensitivity and Specificity Biochemistry Optics Energy Transfer Models Chemical Computer Simulation business Algorithms Bandwidth-limited pulse Excitation |
| Zdroj: | Journal of Magnetic Resonance. 194:58-66 |
| ISSN: | 1090-7807 |
| DOI: | 10.1016/j.jmr.2008.05.023 |
| Popis: | In [K. Kobzar, T.E. Skinner, N. Khaneja, S.J. Glaser, B. Luy, Exploring the limits of broadband excitation and inversion, J. Magn. Reson. 170 (2004) 236–243], optimal control theory was employed in a systematic study to establish physical limits for the minimum rf-amplitudes required in broadband excitation and inversion pulses. In a number of cases, however, experimental schemes are not limited by rf-amplitudes, but by the overall rf-power applied to a sample. We therefore conducted a second systematic study of excitation and inversion pulses of varying pulse durations with respect to bandwidth and rf-tolerances, but this time using a modified algorithm involving restricted rf-power. The resulting pulses display a variety of pulse shapes with highly modulated rf-amplitudes and generally show better performance than corresponding pulses with identical pulse length and rf-power, but limited rf-amplitude. A detailed description of pulse shapes and their performance is given for the so-called power-BEBOP and power-BIBOP pulses. |
| Databáze: | OpenAIRE |
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