Journal
EUROPEAN HEART JOURNAL-CARDIOVASCULAR IMAGING
Volume 14, Issue 11, Pages 1099-1105Publisher
OXFORD UNIV PRESS
DOI: 10.1093/ehjci/jet030
Keywords
Coronary computed tomographic angiography; Low-attenuation plaque; (Semi)-Automated plaque assessment; Plaque delineation techniques
Funding
- General Electric Healthcare
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To compare the accuracy of two plaque delineation methods for coronary computed tomographic angiography (CTA) to identify lipid-core plaque (LCP) using histology as the reference standard. Five ex vivo hearts were analysed by CTA and histology. LCP was defined by histology as fibroatheroma with core diameter/circumference 200 m/60 and cap thickness 450 m. In CTA, plaque was manually delineated either as the difference between the inner and outer vessel walls (Method A) or as a direct tracing of plaque (Method B). Low-attenuation plaque was defined as an area with 90 Hounsfield units. Of 446 co-registered cross-sections, 55 (12) contained LCP. In CTA, low-attenuation plaque area was larger as assessed with Method A compared with Method B (difference: 120 60). Although low-attenuation plaque was associated with the presence of LCP, the delineation Method B yielded higher diagnostic accuracy than Method A [area under the curve (AUC): 0.831 vs. 0.780, respectively, P 0.005]. After excluding normal cross-sections by CTA (n 117), AUC for detecting LCP became similar between both methods (0.767 vs. 0.729, P 0.07, respectively). Low-attenuation plaque in CTA is a diagnostic tool for LCP but prone to error if plaque is defined as the area between the inner and outer vessel walls and normal cross-sections are included in the assessment.
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