Title :
Theoretical and numerical aspects of transmit SENSE
Author :
Katscher, Ulrich ; Börnert, Peter ; Van den Brink, Johan Samuel
Author_Institution :
Philips Res. Lab., Hamburg, Germany
fDate :
4/1/2004 12:00:00 AM
Abstract :
The ideas of parallel imaging techniques, designed to shorten the acquisition time by the simultaneous use of multiple receive coils, can be adapted for parallel transmission of a spatially selective multidimensional RF pulse. In analogy to data acquisition, a multidimensional RF pulse follows a certain trajectory in k-space. Shortening this trajectory shortens the pulse duration. The use of multiple transmit coils, each with its own time-dependent waveform and spatial sensitivity, compensates for the missing parts of k-space. This results in a maintained spatial definition of the pulse profile while its duration is reduced. This paper describes the basic equations of parallel transmission with arbitrarily shaped transmit coils ("Transmit SENSE") focusing on two-dimensional RF pulses. Results of numerical studies are presented demonstrating the theoretical feasibility of the approach.
Keywords :
biomedical MRI; medical image processing; data acquisition; magnetic resonance imaging; multiple receive coils; parallel imaging; parallel imaging techniques; parallel transmission; pulse-shaping methods; spatial sensitivity; spatially selective multidimensional RF pulse; time-dependent waveform; transmit SENSE; Coils; Data acquisition; Equations; Magnetic resonance imaging; Magnetization; Multidimensional systems; Navigation; Pulse shaping methods; Radio frequency; Signal generators; Computer Simulation; Computer-Aided Design; Equipment Design; Equipment Failure Analysis; Feasibility Studies; Image Enhancement; Magnetic Resonance Imaging; Signal Processing, Computer-Assisted;
Journal_Title :
Medical Imaging, IEEE Transactions on
DOI :
10.1109/TMI.2004.824151