| Improvement in image quality of noncontrast head images in multidetector-row CT by volume helical scanning with a three-dimensional denoising filter. | |
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MedLine Citation:
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PMID: 17705009 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: The aim of this study was to improve the contrast-to-noise ratio on noncontrast head computed tomography (CT) images, which are crucial for assessing patients with acute ischemic stroke. We applied a technique combining volume helical scanning with a three-dimensional (3D) denoising filter. MATERIALS AND METHODS: We scanned phantoms for low-contrast resolutions and helical/cone-beam artifacts as well as stroke patients using a 16-row multidetector-row CT (MDCT) unit. Volume helical scans with 1-mm collimation and nonhelical scans with 8-mm thickness were performed. From the 1-mm thick volume data, 8-mm thick contiguous images were generated before and after applying a 3D denoising filter. RESULTS: On images stacked from volume data, the contrast-to-noise ratio was significantly improved by the 3D denoising filter and was nearly the same as that on nonhelical images. On stacked volume images, artifacts due to the cone beam and the helical scan were increased with larger helical pitches, but bone-related streak artifacts in the posterior fossa and underneath the calvarium were reduced when compared with nonhelical images. CONCLUSION: Volume helical scan with a 3D denoising filter effectively improves image quality in noncontrast head MDCT images. |
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Authors:
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Tadashi Sasaki; Makoto Sasaki; Takao Hanari; Hiroshi Gakumazawa; Yasuhiro Noshi; Miwa Okumura |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2007-08-27 |
Journal Detail:
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Title: Radiation medicine Volume: 25 ISSN: 0288-2043 ISO Abbreviation: Radiat Med Publication Date: 2007 Aug |
Date Detail:
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Created Date: 2007-08-20 Completed Date: 2007-11-20 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8412264 Medline TA: Radiat Med Country: Japan |
Other Details:
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Languages: eng Pagination: 368-72 Citation Subset: IM |
Affiliation:
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Center for Radiological Sciences, Iwate Medical University Hospital, 19-1 Uchimaru, Morioka, 020-8505, Japan. sasachu2555@ybb.ne.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Artifacts Female Humans Imaging, Three-Dimensional* Male Middle Aged Phantoms, Imaging Stroke / radiography* Tomography, Spiral Computed / instrumentation* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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