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Abstract

Fat-suppressed MR of the orbit and cavernous sinus: comparison of fast spin-echo and conventional spin-echo.

S K Mukherji, R P Tart, J Fitzsimmons, C Belden, S McGorray, J Guy and A A Mancuso
American Journal of Neuroradiology October 1994, 15 (9) 1707-1714;
S K Mukherji
Department of Radiology, University of Florida College of Medicine, Gainesville 32610.
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R P Tart
Department of Radiology, University of Florida College of Medicine, Gainesville 32610.
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J Fitzsimmons
Department of Radiology, University of Florida College of Medicine, Gainesville 32610.
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C Belden
Department of Radiology, University of Florida College of Medicine, Gainesville 32610.
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S McGorray
Department of Radiology, University of Florida College of Medicine, Gainesville 32610.
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J Guy
Department of Radiology, University of Florida College of Medicine, Gainesville 32610.
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A A Mancuso
Department of Radiology, University of Florida College of Medicine, Gainesville 32610.
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Abstract

PURPOSE To compare T2-weighted fat-suppressed fast spin-echo imaging with fat-suppressed conventional spin-echo imaging in the detection of normal intraorbital and pericavernous anatomy and orbital disease, and to determine the efficacy of fat saturation with T2-weighted fast spin-echo imaging of the cavernous sinus.

METHODS Contrast-to-noise ratios of normal intraorbital anatomy were calculated and compared in 10 consecutive patients using fat-suppressed fast spin-echo and conventional spin-echo T2-weighted images. Contrast-to-noise ratios of common intraorbital lesions were calculated and compared using fat-suppressed fast spin-echo and fat-suppressed conventional spin-echo. Qualitative evaluation was performed and compared for normal intraorbital anatomy using both fat-suppressed fast spin-echo and fat-suppressed conventional spin-echo in 16 patients. Qualitative evaluation for the detection of normal anatomic structures of the pericavernous region was performed and compared using fast spin-echo with and without fat suppression and fat-suppressed conventional spin-echo T2-weighted images in 16 patients. Fat saturation was performed using standard commercially available chemical saturation technique.

RESULTS Reduced imaging time allowed more acquisitions for fat-suppressed fast spin-echo images, which significantly improved visibility of intraorbital and pericavernous anatomy over fat-suppressed conventional spin-echo. Anatomic visibility was also improved because of reduced motion, phase encoding, and susceptibility artifacts. There was no significant difference between contrast-to-noise ratios for fat-suppressed fast spin-echo and fat-suppressed conventional spin-echo imaging of the lateral and medial rectus muscles. Contrast-to-noise ratios of fat suppressed fast spin-echo of orbital disease was significantly greater than contrast-to-noise ratios of fat-suppressed conventional spin-echo. Detection of several normal anatomic structures of the pericavernous region was significantly improved with non-fat-suppressed fast spin-echo over fat-suppressed fast spin-echo because of significantly reduced magnetic susceptibility artifact.

CONCLUSIONS Fat-suppressed fast spin-echo is superior to fat-suppressed conventional spin-echo for T2-weighted orbital imaging. Non-fat-suppressed fast spin-echo is the preferred pulse sequence for T2-weighted imaging of the cavernous sinus because of the minimal susceptibility artifact.

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American Journal of Neuroradiology
Vol. 15, Issue 9
1 Oct 1994
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Fat-suppressed MR of the orbit and cavernous sinus: comparison of fast spin-echo and conventional spin-echo.
S K Mukherji, R P Tart, J Fitzsimmons, C Belden, S McGorray, J Guy, A A Mancuso
American Journal of Neuroradiology Oct 1994, 15 (9) 1707-1714;

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Fat-suppressed MR of the orbit and cavernous sinus: comparison of fast spin-echo and conventional spin-echo.
S K Mukherji, R P Tart, J Fitzsimmons, C Belden, S McGorray, J Guy, A A Mancuso
American Journal of Neuroradiology Oct 1994, 15 (9) 1707-1714;
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