VERSE-guided numerical RF pulse design: A fast method for peak RF power control
نویسندگان
چکیده
منابع مشابه
VERSE-guided numerical RF pulse design: a fast method for peak RF power control.
In parallel excitation, the computational speed of numerical radiofrequency (RF) pulse design methods is critical when subject dependencies and system nonidealities need to be incorporated on-the-fly. One important concern with optimization-based methods is high peak RF power exceeding hardware or safety limits. Hence, online controllability of the peak RF power is essential. Variable-rate sele...
متن کاملVERSE-Guided Numerical RF Pulse Design
INTRODUCTION Numerical optimization-based RF pulse design methods are widely used to incorporate system non-idealities and non-linearities such as field inhomogeneities, coil sensitivities, and signal decay [1-3]. These approaches often lead to RF pulses with high peak RF magnitude exceeding the hardware or safety limits and the variablerate selective excitation (VERSE) principle can be utilize...
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Introduction The optimal control method [1,2] is among existing techniques for large-tip-angle RF pulse design in parallel excitation [1,3-5]. Optimal control has some advantages over other methods; it is robust, it applies to general excitation trajectories, and it provides control over the excited phase pattern. However, it requires long computation times, rendering it unsuitable for online p...
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In parallel RF pulse design, peak RF magnitudes and specific absorption rate levels are critical concerns in the hardware and safety limits. The variable rate selective excitation (VERSE) method is an efficient technique to limit the peak RF power by applying a local-only RF and gradient waveform reshaping while retaining the on-resonance profile. The accuracy of the excitation performed by the...
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1. Introduction Parallel excitation has been introduced as a means of accelerating multi-dimensional, spatially-selective excitation using multiple transmit coils, each driven by a unique RF pulse (1,2). In a manner analogous to parallel imaging, parallel excitation allows the use of a reduced excitation k-space trajectory (7) to achieve a desired excitation pattern, by exploiting the blurring ...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2011
ISSN: 0740-3194
DOI: 10.1002/mrm.23010