| Comparison between low (3:1) and high (6:1) pitch for routine abdominal/pelvic imaging with multislice computed tomography. | |
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MedLine Citation:
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PMID: 12702997 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: The purpose of this study was to compare the performance of low helical pitch acquisition (3:1) and high helical pitch acquisition (6:1) for routine abdominal/pelvic imaging with multislice computed tomography (CT). METHOD: Three hundred eighty-four patients referred for abdominal/pelvic CT were examined in a breath-hold on a multislice CT scanner (LightSpeed QX/I; General Electric Medical Systems, Milwaukee, WI). Patients were randomized and scanned with pitch of 3:1 or 6:1 using a constant 140 peak kV and 280-300 mA. Images were reconstructed at a 3.75-mm slice thickness. Direct comparison between the two pitches was possible in a subset of 40 patients who had a follow-up scan performed with the second pitch used in each patient. A comparison was also performed between standard dose CT using a pitch of 6:1 and 20% reduced radiation dose CT using a pitch of 3:1. Two readers performed a blind evaluation using a three-point scale for image quality, anatomic details, and motion artifacts. Statistical analysis was performed using a rank sum test and the Wilcoxon signed rank test. RESULTS: Overall image quality mean scores were 2.5 and 2.3 for a pitch of 3:1 and a pitch of 6:1, respectively (P = 0.134). Likewise, mean anatomic detail and motion artifact scores were 2.5 and 2.6 for a 3:1 pitch and 2.3 and 2.5 for a 6:1 pitch, respectively (P > 0.05). In patients with a direct comparison of the two pitches (with the standard radiation dose as well as with a 20% reduction in milliamperes), no statistically significant difference in the performance of the two pitches was observed (P > 0.05). CONCLUSION: Image quality with a high pitch (6:1) is acceptable for routine abdominal/pelvic CT. |
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Authors:
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Dushyant Sahani; Sanjay Saini; Roy V D'Souza; Mary Jane O'Neill; Srinivasa R Prasad; Mannudeep K Kalra; Elkan F Halpern; Peter Mueller |
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Publication Detail:
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Type: Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial |
Journal Detail:
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Title: Journal of computer assisted tomography Volume: 27 ISSN: 0363-8715 ISO Abbreviation: J Comput Assist Tomogr Publication Date: 2003 Mar-Apr |
Date Detail:
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Created Date: 2003-04-18 Completed Date: 2003-06-11 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7703942 Medline TA: J Comput Assist Tomogr Country: United States |
Other Details:
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Languages: eng Pagination: 105-9 Citation Subset: IM |
Affiliation:
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Division of Abdominal Imaging and Intervention, Department of Radiology, Massachusetts General Hospital, Boston, MA, USA. dsahani@partners.org |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Aged, 80 and over Diagnostic Tests, Routine Female Follow-Up Studies Humans Male Middle Aged Observer Variation Pelvis / radiography* Prospective Studies Radiographic Image Interpretation, Computer-Assisted Radiography, Abdominal Tomography, X-Ray Computed* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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