[Turbo(fast) spin echo at 0.5 T: effect of echo distance and echo number on image contrast].
Signal intensities, signal-to-noise ratios (S/N), and contrast-to-noise ratios (C/N) in dependence on the echo distance and echo number of the new turbo (fast) spin-echo technique are analysed by phantom, volunteer and patient measurements. With increasing echo number (3 to 15 echoes), signal intensities increase (25 to 50%), S/N varies between different tissues, and C/N of fat to water decreases (70%). A high echo number, although it shortens the imaging time, is thus not always the best choice since the fat/water contrast is lost. However, a high fat/water contrast is advantageous for several MR applications.
Vahlensieck
M
M
Radiologische Klinik, Universität Bonn.
Seelos
K
K
Gieseke
J
J
Reiser
M
M
D001172:Arthritis, Rheumatoid / Q000473:pathology*; D006801:Humans; D007719:Knee Joint / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D011151:Popliteal Cyst / Q000473:pathology*