| On precise localization of boundaries between extended uniform objects in MRI: tooth imaging as an example. | |
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MedLine Citation:
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PMID: 20878537 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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OBJECT: The purpose of this study was to investigate the achievable precision of localization of boundaries between extended uniform objects in MRI and to study the effect of zero-filling on reaching it. MATERIALS AND METHODS: A theoretical model of an object boundary in the presence of noise was introduced, and the error of localization was derived. The effect of zero-filling on reaching the achievable precision was assessed by computer simulations and experimentally on an extracted tooth in a signal-giving medium. RESULTS: With the help of the theoretical model, the achievable precision of localization of boundaries between two uniform extended objects was shown to surpass the nominal resolution by a factor equal to the contrast-to-noise ratio. In the simulations and phantom experiments, zero-filling followed by image segmentation allowed for approaching the theoretical value. As an application example, an MRI-based dental impression was performed in vivo, and a bridge was produced and permanently fixed to the volunteer's teeth. CONCLUSION: This work demonstrates that in an MRI experiment, the achievable precision of localization of object boundaries is not limited to the nominal resolution and can surpass it by an order of magnitude. Zero-filling is a simple and effective method of reaching it. |
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Authors:
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Olga Tymofiyeva; Florian Schmid; Markus von Kienlin; Felix A Breuer; Kurt Rottner; Julian Boldt; Ernst-Juergen Richter; Peter M Jakob |
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Publication Detail:
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Type: Journal Article Date: 2010-09-29 |
Journal Detail:
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Title: Magma (New York, N.Y.) Volume: 24 ISSN: 0968-5243 ISO Abbreviation: MAGMA Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-02-07 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9310752 Medline TA: MAGMA Country: Germany |
Other Details:
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Languages: eng Pagination: 19-28 Citation Subset: IM |
Affiliation:
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Department of Experimental Physics 5, University of Wuerzburg, Am Hubland, 97074, Wuerzburg, Germany, oltymofi@physik.uni-wuerzburg.de. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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