Influence of flip angle variation in TSE sequences on image contrast in liver imaging at 3 Tesla
M von Falkenhausen, M Schuster, J Gieseke, N Morakkabati-Spitz, G Lutterbey, R Blömer, WA Willinek, HH Schild · RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren · 2006 · Heft 07
Bibliografische Angaben
Zusammenfassung
Purpose: T2 weighted Turbo- or Fast Spin Echo Sequences (TSE/FSE) are the backbone of abdominal and pelvic imaging at 1.5T. At higher field strength the benefit of TSE Sequences in reducing acquisition time is restricted by SAR limitations. SAR increases proportionally with the square of the field strength and the square of the angle of the radio frequency pulses, so SAR is mainly affected by the several 180 degree pulses in TSE Sequences. The numerous 180 degree pulses in TSE sequences are the main contribution to energy deposition. To overcome the SAR limitations, techniques to modulate the angles of the refoc…
