Musculoskeletal MR imaging: turbo (fast) spin-echo versus conventional spin-echo and gradient-echo imaging at 0.5 tesla |
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Authors: | M Vahlensieck Ph Lang K Seelos D Yang-Ho Sze S Grampp M Reiser |
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Institution: | (1) Department of Radiology, University of California, San Fransisco, USA;(2) Department of Radiology, University of Bonn, Sigmund-Freud-Strasse 25, D-53127 Bonn, Germany |
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Abstract: | The value of T2-weighted fast spin-echo imaging of the musculoskeletal system was assessed in 22 patients with various neoplastic,
inflammatory, and traumatic disorders. Images were acquired with high echo number (i.e., echo train length) fast spin-echo
(FSE; TR 2000 ms, effective TE 100 ms, echo number 13, lineark-space ordering), conventional spin-echo (SE; TR 2000 ms, TE 100 ms) and gradient-echo (GRE) sequences (TR 600 ms, TE 34 ms,
flip angle 25°). Signal intensities, signal-to-noise ratios, contrast, contrast-to-noise ratios, lesion conspicuousness, detail
perceptibility, and sensitivity towards image artifacts were compared. The high signal intensity of fat on FSE images resulted
in a slightly inferior lesion-to-fat contrast on FSE images. However, on the basis of lesion conspicuity, FSE is able to replace
time-consuming conventional T2-weighted SE imaging in musculoskeletal MRI. In contrast, GRE images frequently showed superior
lesion conspicuity. One minor disadvantage of FSE in our study was the frequent deterioration of image quality by blurring,
black band, and rippling artifacts. Some of these artifacts, however, can be prevented using short echo trains and/or short
echo spacings. |
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Keywords: | Fast spin echo Musculoskeletal MRI Gradient echo Conventional spin echo |
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