| Abdominal multislice CT for obese patients: effect on image quality and radiation dose in a phantom study. | |
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MedLine Citation:
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PMID: 17368219 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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RATIONALE AND OBJECTIVES: To evaluate the effect of a modified abdominal multislice computed tomography (CT) protocol for obese patients on image quality and radiation dose. MATERIALS AND METHODS: An adult female anthropomorphic phantom was used to simulate obese patients by adding one or two 4-cm circumferential layers of fat-equivalent material to the abdominal portion. The phantom was scanned with a subcutaneous fat thickness of 0, 4, and 8 cm using the following parameters (detector configuration/beam pitch/table feed per rotation/gantry rotation time/kV/mA): standard protocol A: 16 x 0.625 mm/1.75/17.5 mm/0.5 seconds/140/380, and modified protocol B: 16 x 1.25 mm/1.375/27.5 mm/1.0 seconds/140/380. Radiation doses to six abdominal organs and the skin, image noise values, and contrast-to-noise ratios (CNRs) were analyzed. Statistical analysis included analysis of variance, Wilcoxon rank sum, and Student's t-test (P < .05). RESULTS: Applying the modified protocol B with one or two fat rings, the image noise decreased significantly (P < .05), and simultaneously, the CNR increased significantly compared with protocol A (P < .05). Organ doses significantly increased, up to 54.7%, comparing modified protocol B with one fat ring to the routine protocol A with no fat rings (P < .05). However, no significant change in organ dose was seen for protocol B with two fat rings compared with protocol A without fat rings (range -2.1% to 8.1%) (P > .05). CONCLUSIONS: Using a modified abdominal multislice CT protocol for obese patients with 8 cm or more of subcutaneous fat, image quality can be substantially improved without a significant increase in radiation dose to the abdominal organs. |
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Authors:
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Sebastian T Schindera; Rendon C Nelson; Ellie R Lee; David M Delong; Giao Ngyen; Greta Toncheva; Terry T Yoshizumi |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Academic radiology Volume: 14 ISSN: 1076-6332 ISO Abbreviation: Acad Radiol Publication Date: 2007 Apr |
Date Detail:
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Created Date: 2007-03-19 Completed Date: 2007-06-05 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9440159 Medline TA: Acad Radiol Country: United States |
Other Details:
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Languages: eng Pagination: 486-94 Citation Subset: IM |
Affiliation:
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Department of Radiology, Duke University Medical Center, Duke University Medical Center, Durham, NC 27710, USA. |
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| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Calibration Female Humans Obesity* Phantoms, Imaging Radiation Dosage Radiography, Abdominal / standards* Statistics, Nonparametric Tomography, X-Ray Computed / standards* |
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