Improving the time efficiency of the Fourier synthesis method for slice selection in magnetic resonance imaging
B Tahayori, N Khaneja, LA Johnston, PM Farrell, IMY Mareels
Physica Medica | Elsevier | Published : 2016
Abstract The design of slice selective pulses for magnetic resonance imaging can be cast as an optimal control problem. The Fourier synthesis method is an existing approach to solve these optimal control problems. In this method the gradient field as well as the excitation field are switched rapidly and their amplitudes are calculated based on a Fourier series expansion. Here, we provide a novel insight into the Fourier synthesis method via representing the Bloch equation in spherical coordinates. Based on the spherical Bloch equation, we propose an alternative sequence of pulses that can be used for slice selection which is more time efficient compared to the original method. Simulation res..View full abstract
This work was supported by the National ICT Australia Victoria Research Laboratory. The first author received Postgraduate Overseas Research Experience Scholarships (PORES) from the University of Melbourne to spend four months at School of Engineering and Applied Mathematics of Harvard University.