Easy improvement of signal-to-noise in RARE-sequences with low refocusing flip angles. Rapid acquisition with relaxation enhancement.
It is demonstrated that the signal intensity in a RARE (TSE, FS...)-sequence with low refocusing flip angle alpha can be significantly increased by setting the flip angle of the first refocusing pulse to 90 degrees +alpha/2. In addition to the gain in signal intensity, the initial signal modulations over the first few echoes are reduced compared to a CPMG-echo train with constant alpha.
Hennig
J
J
Abt. Röntgendiagnostik, Section of Medical Physics, Freiburg, Germany. hennig@nz11.uni-freiburg.de
Scheffler
K
K
D016477:Artifacts; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data; D019047:Phantoms, Imaging