Continuous SWIFT.
This work describes our first efforts to implement SWIFT (SWeep Imaging with Fourier Transformation) in continuous mode for imaging and spectroscopy. We connected a standard quadrature hybrid with a quad coil and acquired NMR signal during continuous radiofrequency excitation. We utilized a chirped radiofrequency pulse to minimize the instantaneous radiofrequency field during excitation of the spin system for the target flip angle and bandwidth. Due to the complete absence of "dead time", continuous SWIFT has the potential to extend applications of MRI and spectroscopy in studies of spin systems having extremely fast relaxation or broad chemical shift distributions beyond the range of existing MRI sequences.
Center for Magnetic Resonance Research and Department of Radiology University of Minnesota Medical School, Minneapolis, MN, USA. idiat001@tc.umn.edu
Djaudat
D
Idiyatullin
Steven
S
Suddarth
Curtis A
CA
Corum
Gregor
G
Adriany
Michael
M
Garwood
D004867:Equipment Design; D019544:Equipment Failure Analysis; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation*; D014159:Transducers