| Fast T2*-weighted MRI of the prostate at 3 tesla. | |
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MedLine Citation:
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PMID: 21448956 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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PURPOSE: To describe a rapid T2*-weighted (T2*W), three-dimensional (3D) echo planar imaging (EPI) sequence and its application in mapping local magnetic susceptibility variations in 3 Tesla (T) prostate MRI. To compare the sensitivity of T2*W EPI with routinely used T1-weighted turbo-spin echo sequence (T1W TSE) in detecting hemorrhage and the implications on sequences sensitive to field inhomogeneities such as MR spectroscopy (MRS). MATERIALS AND METHODS: B(0) susceptibility weighted mapping was performed using a 3D EPI sequence featuring a 2D spatial excitation pulse with gradients of spiral k-space trajectory. A series of 11 subjects were imaged using 3T MRI and combination endorectal (ER) and six-channel phased array cardiac coils. T1W TSE and T2*W EPI sequences were analyzed quantitatively for hemorrhage contrast. Point resolved spectroscopy (PRESS MRS) was performed and data quality was analyzed. RESULTS: Two types of susceptibility variation were identified: hemorrhagic and nonhemorrhagic T2*W-positive areas. Post-biopsy hemorrhage lesions showed on average five times greater contrast on the T2*W images than T1W TSE images. Six nonhemorrhage regions of severe susceptibility artifact were apparent on the T2*W images that were not seen on standard T1W or T2W images. All nonhemorrhagic susceptibility artifact regions demonstrated compromised spectral quality on 3D MRS. CONCLUSION: The fast T2*W EPI sequence identifies hemorrhagic and nonhemorrhagic areas of susceptibility variation that may be helpful in prostate MRI planning at 3.0T. J. Magn. Reson. Imaging 2011;33:902-907. © 2011 Wiley-Liss, Inc. |
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Authors:
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Rulon L Hardman; Fadi El-Merhi; Adam J Jung; Steve Ware; Ian M Thompson; Harry T Friel; Qi Peng |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of magnetic resonance imaging : JMRI Volume: 33 ISSN: 1522-2586 ISO Abbreviation: J Magn Reson Imaging Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-03-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9105850 Medline TA: J Magn Reson Imaging Country: United States |
Other Details:
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Languages: eng Pagination: 902-7 Citation Subset: IM |
Copyright Information:
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Copyright © 2011 Wiley-Liss, Inc. |
Affiliation:
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Department of Radiology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA. hardmanr@uthscsa.edu. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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