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Fat Signal Suppression in Head and Neck Imaging Using Fast Spin-Echo-IDEAL Technique

A.V. Bargera, D.R. DeLonea, M.A. Bernsteina and K.M. Welkera

a From the Department of Radiology, Mayo Clinic, Rochester, Minn


Figure 1
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  		Fig 1. T2-weighted axial images obtained by using (A) CHESS-FSE sequence with a scan time of 2:32 minutes and (B) FSE-IDEAL sequence with a scan time of 2:33 minutes. The patient had a history of right parotidectomy for poorly differentiated parotid carcinoma. Despite careful shimming, fat signal intensity in the region of the operative bed (arrow) in the CHESS-FSE sequence is not clearly suppressed. The FSE-IDEAL image has uniform fat suppression throughout the field, allowing for better visualization of residual parotid parenchyma (arrow).


Figure 2
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  		Fig 2. Coronal T2-weighted (A) and postgadolinium T1-weighted (B) FSE-IDEAL water images. Numerous small tumor droplets (arrows) from a spilled pleomorphic adenoma are seen overlying the left masseter.


Figure 3
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  		Fig 3. Axial postgadolinium FSE-IDEAL T1-weighted images (A–C) demonstrate a polymorphous adenocarcinoma of the right maxillary sinus extending through the pterygopalatine fossa to the inferior orbital fissure. Coronal postgadolinium T1-weighted FSE-IDEAL image (D) is diagnostically limited due to unfortunate fat-water mismap at the right pterygopalatine fossa (arrows).





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X