Carotid artery intra-plaque attenuation variability using computed tomography View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2016-12

AUTHORS

Luca Saba, Michele Anzidei, Carlo Nicola de Cecco, Michele Porcu, Antonella Balestrieri, Roberto Sanfilippo, Marco Francone, Alessio Mereu, Pierleone Lucatelli, Roberto Montisci, Jasjit S. Suri, Max Wintermark

ABSTRACT

In the CT assessment of the carotid plaque, the analysis of the attenuation value is a fundamental parameter in order to classify the type of the tissue that composes the plaque. The purpose of this paper is to assess the intra-plaque attenuation variability in order to verify the potential reproducibility of HU measurements. In this retrospective study, 68 consecutive patients (males 42; average age 64 ± 11 years) that underwent CT of carotid arteries were included. Exams were performed before and after administration of contrast medium and in each slice 4 different circular or elliptical ROIs (≥1 and ≤ 2 mm2) were traced and attenuation values were recorded. Wilcoxon and Mann-Whitney test were used to test the differences between the ROI. A total of 192 slices were analysed. The average value of attenuation before contrast medium was 41.591(SD 8.1) HU and 54.159 (SD 15.7) in post-contrast scan. Mann-Whitney test did not find statistically significant difference among the ROI in the pre-contrast scan whereas a statistically significant differences was found in post-contrast scan. Wilcoxon analysis showed a statistically significant difference (p value = 0.001) between pre and post-contrast attenuation. In conclusion, results of our study suggest that ROI sampling performed in the CT dataset acquired after administration of contrast medium show significant degree of heterogeneity and a statistically significant differences compared to the baseline measurement. This effect may be driven by a different amount of contrast acquisition in some areas of the carotid artery plaque. More... »

PAGES

12

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s40809-016-0023-4

DOI

http://dx.doi.org/10.1186/s40809-016-0023-4

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1033594657


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36 schema:description In the CT assessment of the carotid plaque, the analysis of the attenuation value is a fundamental parameter in order to classify the type of the tissue that composes the plaque. The purpose of this paper is to assess the intra-plaque attenuation variability in order to verify the potential reproducibility of HU measurements. In this retrospective study, 68 consecutive patients (males 42; average age 64 ± 11 years) that underwent CT of carotid arteries were included. Exams were performed before and after administration of contrast medium and in each slice 4 different circular or elliptical ROIs (≥1 and ≤ 2 mm2) were traced and attenuation values were recorded. Wilcoxon and Mann-Whitney test were used to test the differences between the ROI. A total of 192 slices were analysed. The average value of attenuation before contrast medium was 41.591(SD 8.1) HU and 54.159 (SD 15.7) in post-contrast scan. Mann-Whitney test did not find statistically significant difference among the ROI in the pre-contrast scan whereas a statistically significant differences was found in post-contrast scan. Wilcoxon analysis showed a statistically significant difference (p value = 0.001) between pre and post-contrast attenuation. In conclusion, results of our study suggest that ROI sampling performed in the CT dataset acquired after administration of contrast medium show significant degree of heterogeneity and a statistically significant differences compared to the baseline measurement. This effect may be driven by a different amount of contrast acquisition in some areas of the carotid artery plaque.
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