Robust selective signal suppression using binomial off-resonant rectangular (BORR) pulses
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PURPOSE: To study the selective signal suppression capability of a binomial off-resonant rectangular (BORR) radiofrequency pulse method. MATERIALS AND METHODS: The BORR pulse consists of two consecutive rectangular pulses with a phase difference of π. The exact solution of the Bloch equations was used to simulate its frequency response. The BORR pulse was implemented in a gradient echo sequence and tested on phantoms, the knee, and the breast. RESULTS: The frequency response of the BORR pulse acquired on the phantom confirmed the theory. Broad suppression bands ensured high suppression efficiency and robustness in both in vitro and in vivo scans compared with other saturation pulses. CONCLUSION: The BORR pulse method provides a simple, efficient, and robust selective signal suppression alternative for three-dimensional short TR (repetition time) imaging.
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