| Quantitative three-dimensional power Doppler angiography: a flow-free phantom experiment to evaluate the relationship between color gain, depth and signal artifact. | |
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MedLine Citation:
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PMID: 20084642 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES: To evaluate the presence of false flow three-dimensional (3D) power Doppler signals in 'flow-free' models. METHODS: 3D power Doppler datasets were acquired from three different flow-free phantoms (muscle, air and water) with two different transducers and Virtual Organ Computer-aided AnaLysis was used to generate a sphere that was serially applied through the 3D dataset. The vascularization flow index was used to compare artifactual signals at different depths (from 0 to 6 cm) within the different phantoms and at different gain and pulse repetition frequency (PRF) settings. RESULTS: Artifactual Doppler signals were seen in all phantoms despite these being flow-free. The pattern was very similar and the degree of artifact appeared to be dependent on the gain and distance from the transducer. False signals were more evident in the far field and increased as the gain was increased, with false signals first appearing with a gain of 1 dB in the air and muscle phantoms. False signals were seen at a lower gain with the water phantom (-15 dB) and these were associated with vertical lines of Doppler artifact that were related to PRF, and disappeared when reflections were attenuated. CONCLUSIONS: Artifactual Doppler signals are seen in flow-free phantoms and are related to the gain settings and the distance from the transducer. In the in-vivo situation, the lowest gain settings that allow the detection of blood flow and adequate definition of vessel architecture should be used, which invariably means using a setting near or below the middle of the range available. Additionally, observers should be aware of vertical lines when evaluating cystic or liquid-containing structures. |
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Authors:
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W P Martins; N J Raine-Fenning; R A Ferriani; C O Nastri |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology Volume: 35 ISSN: 1469-0705 ISO Abbreviation: Ultrasound Obstet Gynecol Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-03-10 Completed Date: 2010-09-16 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9108340 Medline TA: Ultrasound Obstet Gynecol Country: England |
Other Details:
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Languages: eng Pagination: 361-8 Citation Subset: IM |
Copyright Information:
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(c) 2010 ISUOG. Published by John Wiley & Sons, Ltd. |
Affiliation:
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Departamento de Ginecologia e Obstetrícia da Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Brazil. wpmartins@gmail.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Artifacts* Color* Female Humans Imaging, Three-Dimensional / instrumentation*, methods Models, Cardiovascular Phantoms, Imaging* Ultrasonography, Doppler, Color / methods |
| Comments/Corrections | |
Comment In:
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Ultrasound Obstet Gynecol. 2010 Jul;36(1):126-7; author reply 127-8
[PMID:
20582933
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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