Development and optimization of T2 weighted methods with reduced RF power deposition (Hyperecho-TSE) for magnetic resonance imaging.
Turbo or fast spin echo (TSE/FSE) techniques with variable flip angles have the potential to overcome specific absorption rate (SAR) limitations. Such Hyperecho-TSE sequences allow for high resolution imaging with full signal-to-noise ratio (SNR) compared to standard TSE methods. Initially, a short overview of the two basic hyperecho schemes is given. Subsequently, the manuscript focuses on the flexible hyperecho approach "TRAPS" (smooth transitions between pseudo steady states). Basic criteria for flip angle ramp selection are illustrated. Further prerequisites to establish hyperecho methods in a clinical environment such as an automatic ramp selection are discussed. A summary of the introduced framework for contrast characterization and adaptation for conventional and Hyperecho-TSE sequences is presented Finally, recent developments in hyperecho imaging are provided
Weigel
Matthias
M
Department of Diagnostic Radiology, Medical Physics, University Hospital Freiburg, Hugstetter Strasse 55, D-79106 Freiburg. Matthias.Weigel@uniklinik-freiburg.de
Hennig
Juergen
J
D001921:Brain / Q000033:anatomy & histology; D003198:Computer Simulation; D003287:Contrast Media; D017352:Echo-Planar Imaging / Q000379:methods; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods*; D012680:Sensitivity and Specificity
D003287:Contrast Media