| Uniform vascular enhancement of lower-extremity artery on CT angiography using test-injection monitoring at the central level of the scan range: a simulation flow phantom study with clinical correlation. | |
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MedLine Citation:
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PMID: 20605732 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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RATIONALE AND OBJECTIVES: To evaluate the efficacy of variable contrast injection durations and scanning delay determined by test injection analysis of computed tomography angiography (CTA) of peripheral arteries. MATERIALS AND METHODS: We used a flow phantom that simulates the hemodynamics in a lower extremity artery. We set the flow rate at the pump to 2.0 or 5.0 L/minute. In protocol 1, we adopted a variable contrast injection duration based on the peak enhancement time of the test injection monitoring at the central level of the scan range. In protocol 2, we adopted a fixed contrast injection duration. The scanning delay was determined with a conventional bolus-tracking technique monitoring at the top of the scan range. Mean arterial attenuation and difference between the maximum and minimum attenuation values were calculated. To verify the phantom study results, clinical study, including 16 patients was performed under protocol 1. RESULTS: The mean attenuation values under protocols 1 and 2 were comparable (563.6 Hounsfield units [HU] and 535.0 HU, respectively) at a pump flow rate of 2.0 L/minute; at 5.0 L/minute, they were 289.4 HU and 328.8 HU. The difference between the maximum and minimum attenuation values was smaller under protocol 1 than protocol 2 (76.8 HU vs. 184.9 HU) at a pump flow of 2.0 L/minute and also smaller under protocol 1 than protocol 2 (79.7 HU vs. 203.8 HU) at 5.0 L/minute. In clinical study, the mean attenuation value was 332.6 +/- 51.9 HU, and the difference between the maximum and minimum attenuation values was 55.1 +/- 24.4 HU. CONCLUSION: The object-specific injection duration based on test injection at the central level of the scan range provides sufficient and constant vascular enhancement at CTA. |
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Authors:
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Kie Shimizu; Daisuke Utsunomiya; Takeshi Nakaura; Kazuo Awai; Seitaro Oda; Yumi Yanaga; Yoshinori Funama; Toshinori Hirai; Masahiro Hashida; Yasuyuki Yamashita |
Publication Detail:
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Type: Journal Article Date: 2010-06-01 |
Journal Detail:
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Title: Academic radiology Volume: 17 ISSN: 1878-4046 ISO Abbreviation: Acad Radiol Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-09 Completed Date: 2011-01-10 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: 1153-7 Citation Subset: IM |
Copyright Information:
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Copyright 2010 AUR. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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Central Radiology, Kumamoto University, Kumamoto-shi, Kumamoto, 860-8556, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Angiography
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methods* Contrast Media / administration & dosage Humans Iopamidol / administration & dosage*, diagnostic use* Lower Extremity / blood supply*, radiography* Models, Biological Peripheral Arterial Disease / radiography Phantoms, Imaging Radiographic Image Enhancement / methods* Radiographic Image Interpretation, Computer-Assisted / methods Reproducibility of Results Sensitivity and Specificity Tomography, X-Ray Computed / methods* |
| Chemical | |
Reg. No./Substance:
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0/Contrast Media; 62883-00-5/Iopamidol |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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