Document Detail

Abdominal multislice CT for obese patients: effect on image quality and radiation dose in a phantom study.
MedLine Citation:
PMID:  17368219     Owner:  NLM     Status:  MEDLINE    
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.
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:
Type:  Journal Article    
Journal Detail:
Title:  Academic radiology     Volume:  14     ISSN:  1076-6332     ISO Abbreviation:  Acad Radiol     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-03-19     Completed Date:  2007-06-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9440159     Medline TA:  Acad Radiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  486-94     Citation Subset:  IM    
Department of Radiology, Duke University Medical Center, Duke University Medical Center, Durham, NC 27710, USA.
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MeSH Terms
Analysis of Variance
Phantoms, Imaging
Radiation Dosage
Radiography, Abdominal / standards*
Statistics, Nonparametric
Tomography, X-Ray Computed / standards*

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