Iterative RF pulse refinement for magnetic resonance imaging. Academic Article

abstract

• Selective RF pulses are needed for many applications in magnetic resonance imaging (MRI). The waveform required to produce a desired excitation profile is, to first-order, its Fourier transform. This approximation is most valid for small tip angles and the quality and accuracy of such excitations decreases with increasing tip angle. Since large-tip-angle excitations are required in most types of imaging, a better synthesis technique is necessary. While a variety of analytical and numerical synthesis techniques based on solution of the Bloch equations are available, these techniques fail to consider the effect of the physical scanner hardware and are often accompanied by computational complexity. We present a technique for selective RF pulse refinement which uses real-time feedback techniques in lieu of a solution to the Bloch equations. Physical experiments are conducted to demonstrate the effectiveness of this algorithm and an extension to pulses of 90 degrees is investigated.

authors

• Wright, Steven

published proceedings

• IEEE Trans Biomed Eng

altmetric score

• 6

author list (cited authors)

• Lebsack, E. T., & Wright, S. M.

citation count

• 10

complete list of authors

• Lebsack, Eliot T||Wright, Steven M

publication date

• January 2002

publisher

• Institute of Electrical and Electronics Engineers (IEEE)  Publisher

published in

• IEEE Transactions on Biomedical Engineering  Journal

keywords

• Algorithms
• Fourier Analysis
• Magnetic Resonance Imaging
• Mathematics
• Signal Processing, Computer-Assisted

PubMed Central ID

• 11794770

Digital Object Identifier (DOI)

• 10.1109/10.972838

start page

• 41

end page

• 48

volume

• 49

issue

• 1

URL

• http://dx.doi.org/10.1109/10.972838