[Evaluation of rapid gradient-echo and turbo-spin-echo sequences in MRT of focal liver lesions using 0.5 tesla].
The value of rapid T1- and T2-weighted fast field (T1-FFE, T2-FFE) gradient-echo sequences and T2 weighted turbo-spin echo (TSE) sequences in the diagnosis of focal liver lesions using 0.5 Tesla was compared with conventional spin-echo sequences (SE). Amongst 88 liver lesions T1-SE sequences showed 98%, T2-TSE sequences showed 92%, T2-SE sequence showed 84%, T1-FFE sequence showed 78% and T2-FFE sequence showed 69%. Direct comparison has shown that TSE sequences are able to demonstrate significantly more lesions (p < 0.05) than T2-SE sequences. Quantitative assessment has shown that the tumor/liver contrast/noise ratio in the T1-SE sequence was 118% higher than in the T1-FFE sequence (p < 0.001). Comparison of T2 weighted sequences has shown that the tumour/liver contrast/noise ratio was 45% higher in the TSE sequence than in the T2-SE and 239% higher than in the T2-FFE sequence (p < 0.001). The results indicate that the TSE sequence should be used instead of the conventional T2-SE sequence because of the reduced time (about 40%), due to improved image quality and increased demonstration rate of liver lesions. Neither T1-FFE nor T2-FFE are suitable, when using moderate field strength, to replace T1-SE or TSE sequences.
Kreft
B
B
Radiologische Klinik, Universität Bonn.
Layer
G
G
Spiller
L
L
Träber
F
F
Wolff
M
M
Gieseke
J
J
Steudel
A
A
D000230:Adenocarcinoma / Q000175:diagnosis / Q000556:secondary; D006528:Carcinoma, Hepatocellular / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005069:Evaluation Studies as Topic; D005260:Female; D006391:Hemangioma / Q000175:diagnosis*; D006801:Humans; D006965:Hyperplasia; D008107:Liver Diseases / Q000175:diagnosis; D008113:Liver Neoplasms / Q000175:diagnosis* / Q000556:secondary; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male
Evaluierung schneller Gradienten-Echo- und Turbo-Spin-Echo-Sequenzen in der MRT von fokalen Leberläsionen bei 0.5 Tesla.