Efficient method to design RF pulses for parallel excitation MRI using gridding and conjugate gradient.

abstract

• Parallel excitation (pTx) techniques with multiple transmit channels have been widely used in high field MRI imaging to shorten the RF pulse duration and/or reduce the specific absorption rate (SAR). However, the efficiency of pulse design still needs substantial improvement for practical real-time applications. In this paper, we present a detailed description of a fast pulse design method with Fourier domain gridding and a conjugate gradient method. Simulation results of the proposed method show that the proposed method can design pTx pulses at an efficiency 10 times higher than that of the conventional conjugate-gradient based method, without reducing the accuracy of the desirable excitation patterns.

authors

• Ji, Jim

published proceedings

• Quant Imaging Med Surg

author list (cited authors)

• Feng, S., & Ji, J.

complete list of authors

• Feng, Shuo||Ji, Jim

published in

• Quantitative Imaging in Medicine and Surgery  Journal

keywords

• Gridding
• High Field Magnetic Resonance Imaging (high Field Mri)
• Mri Coil Array
• Parallel Excitation (ptx)
• Radio Frequency Pulse Design (rf Pulse Design)

PubMed Central ID

• 24834420

Digital Object Identifier (DOI)

• 10.3978/j.issn.2223-4292.2014.04.09

start page

• 87

end page

• 92

volume

• 4

issue

• 2