| Ghosting of pulmonary nodules with respiratory motion: comparison of helical and conventional CT using an in vitro pediatric model. | |
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MedLine Citation:
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PMID:Â 8911178 Â Â Â Owner:Â NLM Â Â Â Status:Â MEDLINE Â Â Â |
Abstract/OtherAbstract:
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OBJECTIVE: The study was designed to compare helical CT with varying pitch and reconstruction intervals and conventional CT for revealing pulmonary nodules in a model that simulates respiratory motion in children. MATERIALS AND METHODS: CT scans were obtained in an experimental model with one nodule (3 or 10 mm) in each scan. One-second scans were obtained at rates of 10, 20, and 30 respirations per minute using conventional CT with 4-mm collimation and table incrementation and helical CT with 4-mm collimation and either 4-mm/sec (pitch, 1:1) or 8-mm/sec (pitch, 2:1) table speed. Reconstructions were at 1-, 2-, and 4-mm intervals for scans obtained using 4-mm/sec table speed and at 1- and 4-mm intervals for scans obtained using 8-mm/sec table speed. Images were independently reviewed by three radiologists who estimated the number of nodules on each image. RESULTS: Ghosting (depiction of more than one nodule in a study) was seen in 79%, 80%, and 75% of helical CT scans obtained with a 1:1 pitch using 1-, 2-, and 4-mm reconstruction intervals, respectively. By comparison, ghosting was seen in only 54% and 58% of helical CT scans with a 2:1 pitch using 1-mm reconstruction intervals and 4-mm reconstruction intervals, respectively, and in 56% of conventional CT scans (p < .0001). A single nodule was detected on all other scans, and at least one nodule was seen on all scans. CONCLUSION: Ghosting of nodules is common in this model. Ghosting was seen less often on conventional scans and helical scans with 2:1 pitch than it was on helical scans with 1:1 pitch. Nonetheless, ghosting was seen on more than 50% of all scans with each technique. |
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Authors:
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G D Luker; K T Bae; M J Siegel; S Don; J A Brink; G Wang; T E Herman |
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Publication Detail:
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Type: Comparative Study; Journal Article    |
Journal Detail:
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Title: AJR. American journal of roentgenology    Volume: 167    ISSN: 0361-803X    ISO Abbreviation: AJR Am J Roentgenol    Publication Date: 1996 Nov |
Date Detail:
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Created Date:Â 1996-12-26 Â Â Â Completed Date:Â 1996-12-26 Â Â Â Revised Date:Â 2008-11-21 Â Â Â |
Medline Journal Info:
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Nlm Unique ID: 7708173    Medline TA: AJR Am J Roentgenol    Country: UNITED STATES    |
Other Details:
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Languages: eng    Pagination: 1189-93    Citation Subset: AIM; IM    |
Affiliation:
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Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Artifacts* Child Forecasting Humans Image Processing, Computer-Assisted / methods Lung / radiography Phantoms, Imaging* Radiographic Image Enhancement / methods Respiration* Solitary Pulmonary Nodule / radiography* Tomography, X-Ray Computed / methods* |
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