| Phase enhancement for time-of-flight and flow-sensitive black-blood MR angiography. | |
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MedLine Citation:
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PMID: 21360743 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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A magnitude-based MR angiography method of standard time-of-flight (TOF) employing a three-dimensional gradient-echo sequence with flow rephasing is widely used. A recently proposed flow-sensitive black-blood (FSBB) method combining three-dimensional gradient-echo sequence with a flow-dephasing gradient and a hybrid technique, called hybrid of opposite-contrast, allow depiction of smaller blood vessels than does standard TOF. To further enhance imaging of smaller vessels, a new enhancement technique combining phase with magnitude is proposed. Both TOF and FSBB pulse sequences were used with only 0th-order gradient moment nulling, and suitable dephasing gradients were added to increase the phase shift introduced mainly by flow. Magnitude-based vessel-to-background contrast-to-noise ratios in TOF and FSBB were further enhanced to increase the dynamic range between positive and negative signals through the use of cosine-function-based filters for white- and black-blood imaging. The proposed phase-enhancement processing both improved visualization of slow-flow vessels in the brains of volunteer subjects with shorter echo time in TOF, FSBB, and hybrid of opposite-contrast and reduced wraparound artifacts with smaller b values without sacrificing vessel-to-background contrast in FSBB. This method of enhancement processing has excellent potential to become clinically useful. Magn Reson Med, 2011. © 2011 Wiley-Liss, Inc. |
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Authors:
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Tokunori Kimura; Masato Ikedo; Shuhei Takemoto |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-28 |
Journal Detail:
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Title: Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine Volume: - ISSN: 1522-2594 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-3-1 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8505245 Medline TA: Magn Reson Med Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Wiley-Liss, Inc. |
Affiliation:
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MRI Systems Development Department, Toshiba Medical Systems Corporation, Shimoishigami, Otawara-Shi, Tochigi-Ken, Japan. kimura@mr.nasu.toshiba.co.jp. |
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