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Abstract

Magnetization transfer imaging of the head and neck: normative data.

D M Yousem, M D Schnall, L Dougherty, G S Weinstein and R E Hayden
American Journal of Neuroradiology June 1994, 15 (6) 1117-1121;
D M Yousem
Department of Radiology and Otorhinolaryngology, Hospital of the University of Pennsylvania, Philadelphia 19104.
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M D Schnall
Department of Radiology and Otorhinolaryngology, Hospital of the University of Pennsylvania, Philadelphia 19104.
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L Dougherty
Department of Radiology and Otorhinolaryngology, Hospital of the University of Pennsylvania, Philadelphia 19104.
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G S Weinstein
Department of Radiology and Otorhinolaryngology, Hospital of the University of Pennsylvania, Philadelphia 19104.
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R E Hayden
Department of Radiology and Otorhinolaryngology, Hospital of the University of Pennsylvania, Philadelphia 19104.
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Abstract

PURPOSE To determine magnetization transfer ratios for normal head and neck structures so that evaluation of disease will be possible.

METHODS Two-dimensional magnetization transfer imaging was performed in 12 healthy volunteers and 20 patients. We used a repetition time of 500, echo time of 12, 20 degrees flip angle, and a magnetization transfer pulse offset from the resonance frequency of water by 2000 Hz (pulse duration 19 milliseconds, waveform area approximately 10 times greater than that of a 90 degree pulse). Magnetization transfer ratios (1 - [intensity after suppression/intensity before suppression]) were calculated for normal structures.

RESULTS The magnetization transfer ratio of facial muscles (0.54) was equivalent to that of tongue muscles (0.54). These values exceeded those of parotid (0.39) and submandibular glands (0.41). Fat (0.07) and cerebrospinal fluid (0.05) had negligible transfer.

CONCLUSION Magnetization transfer imaging is a simple and effective means of studying the contribution of macromolecular protons to the MR image. Normal neck structures show a wide range of magnetization transfer rates, maximal for muscle and minimal for cerebrospinal fluid and fat.

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American Journal of Neuroradiology
Vol. 15, Issue 6
1 Jun 1994
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Magnetization transfer imaging of the head and neck: normative data.
D M Yousem, M D Schnall, L Dougherty, G S Weinstein, R E Hayden
American Journal of Neuroradiology Jun 1994, 15 (6) 1117-1121;

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Magnetization transfer imaging of the head and neck: normative data.
D M Yousem, M D Schnall, L Dougherty, G S Weinstein, R E Hayden
American Journal of Neuroradiology Jun 1994, 15 (6) 1117-1121;
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