| Extending slice coverage for breathhold fat-suppressed T2-weighted fast spin-echo of the liver at 3.0T: application of variable-rate selective-excitation (VERSE) RF pulses. | |
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MedLine Citation:
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PMID: 18058934 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To determine the benefits of variable-rate selective-excitation (VERSE) radio frequency (RF) pulses for increased slice coverage in breathhold (BH) fat-suppressed T2-weighted fast spin-echo (FS-T2W-FSE) liver imaging at 3.0T. MATERIALS AND METHODS: A total of 12 healthy volunteers were imaged on 3.0T, using FS-T2W-FSE. Slice coverage and specific absorption rate (SAR) levels were monitored for VERSE-RF and standard-RF (sRF), respectively. BH time was 25 seconds; slice thickness 3.5 mm. Maximum coverage was recorded for interactive variation of repetition time (TR), bandwidth (BW), and echo-train length (ETL). Image quality was assessed qualitatively and quantitatively. RESULTS: Total slice coverage was always higher using VERSE-RF, but varied depending on the selected parameters. For BW > or = 62.5 kHz, slice coverage using VERSE increased between 38% (TR = 8200 msec) and 58% (TR = 2500 msec). Maximum coverage was obtained for TR = 5000 msec, ETL = 12, and BW > or = 62.5 kHz; with a mean of 31.8 slices for VERSE-RF and 22.5 slices for sRF, respectively (P < 0.005, 41% increased coverage). SAR was lower for VERSE-RF using BW < 41.67 kHz (P < 0.05), and equal to sRF for higher BW. Image quality was best for TR < or = 5000 msec (P < 0.05). FS was more homogeneous for lower ETL (P < 0.05). Blood suppression was best for TR < or = 5000 msec (P < 0.05). CONCLUSION: VERSE-RF pulses can be applied for thin-slice BH FS-T2W liver imaging at 3.0T, with significantly improved slice coverage. |
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Authors:
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Indra C van den Bos; Shahid M Hussain; Gabriel P Krestin; Piotr A Wielopolski |
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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: 27 ISSN: 1053-1807 ISO Abbreviation: J Magn Reson Imaging Publication Date: 2008 Jan |
Date Detail:
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Created Date: 2007-12-27 Completed Date: 2008-03-25 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: 110-6 Citation Subset: IM |
Affiliation:
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Department of Radiology, Erasmus Medical Center, The Netherlands. vandenbos.ic@gmail.com |
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| MeSH Terms | |
Descriptor/Qualifier:
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Female Humans Image Enhancement / methods* Image Processing, Computer-Assisted Liver / anatomy & histology* Magnetic Resonance Imaging / methods* Male Statistics, Nonparametric |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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