| Effect of temporal interval between scan acquisitions on quantitative vascular parameters in colorectal cancer: implications for helical volumetric perfusion CT techniques. | |
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MedLine Citation:
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PMID: 19020217 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: The purpose of this study was to determine how the temporal interval between scan acquisitions influences quantitative perfusion CT vascular parameters in colorectal cancer. SUBJECTS AND METHODS: Forty-five patients with colorectal adenocarcinoma prospectively underwent a 65-second single-anatomic-level perfusion CT study. Blood flow, blood volume, transit time, and permeability-surface area product for a 2-cm tumor coverage were determined with commercial software based on distributed parameter analysis for four temporal intervals (1, 2, 3, and 4 seconds) between acquisitions. Mean vascular values obtained for these intervals were compared by use of analysis of variance with posttesting by the Bonferroni method. Statistical significance was set at 5%. RESULTS: Mean +/- SD blood flow, volume, transit, and permeability-surface area product were 71.5 +/- 34.8 mL/min/100 g tissue, 6.33 +/- 1.96 mL/100 g tissue, 10.8 +/- 5.54 seconds, and 14.9 +/- 3.51 mL/min/100 g tissue, respectively, at 1 second; 86.6 +/- 40.6 mL/min/100 g tissue, 6.30 +/- 2.53 mL/100 g tissue, 10.7 +/- 7.12 seconds, and 14.5 +/- 3.55 mL/min/100 g tissue at 2 seconds; 97.8 +/- 42.7 mL/min/100 g tissue, 5.98 +/- 1.72 mL/100 g tissue, 8.11 +/- 4.37 seconds, and 14.5 +/- 3.58 mL/min/100 g tissue at 3 seconds; and 108.8 +/- 46.0 mL/min/100 g tissue, 6.69 +/- 3.46 mL/100 g tissue, 7.12 +/- 3.54 seconds, and 13.9 +/- 3.49 mL/min/100 g tissue at 4 seconds. Blood flow was overestimated (p = 0.0002) and transit underestimated (p = 0.03) with lengthening acquisition interval. Posttesting revealed that in a comparison with 1-second data, this difference was significant for 3- and 4-second data for blood flow and 4-second data for transit. CONCLUSION: Increasing the temporal interval from 1 to 4 seconds leads to overestimation of tumor blood flow and underestimation of blood transit in distributed parameter analysis. Use of the helical perfusion CT techniques being developed may lead to inaccurate assessment unless the acquisition interval is shorter than 3 seconds. |
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Authors:
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Vicky Goh; Jonathan Liaw; Clive I Bartram; Steve Halligan |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: AJR. American journal of roentgenology Volume: 191 ISSN: 1546-3141 ISO Abbreviation: AJR Am J Roentgenol Publication Date: 2008 Dec |
Date Detail:
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Created Date: 2008-11-21 Completed Date: 2009-01-06 Revised Date: - |
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: W288-92 Citation Subset: AIM; IM |
Affiliation:
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Paul Strickland Scanner Centre, Mount Vernon Hospital, Rickmansworth Rd., Northwood, Middlesex, HA6 2RN, United Kingdom. vicky.goh@stricklandscanner.org.uk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adenocarcinoma
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blood supply,
radiography* Adult Aged Aged, 80 and over Colorectal Neoplasms / blood supply, radiography* Female Humans Male Middle Aged Myocardial Perfusion Imaging / methods* Neovascularization, Pathologic / radiography* Radiographic Image Enhancement / methods* Reproducibility of Results Sensitivity and Specificity Time Factors Tomography, Spiral Computed / methods* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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