Diffusion-weighted magnetic resonance imaging for the detection of lipid-rich necrotic core in carotid atheroma in vivo View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2010-10

AUTHORS

Victoria Eleanor Young, Andrew J. Patterson, Umar Sadat, David J. Bowden, Martin J. Graves, Tjun Y. Tang, Andrew N. Priest, Jeremy N. Skepper, Peter J. Kirkpatrick, Jonathan H. Gillard

ABSTRACT

INTRODUCTION: Research has shown that knowing the morphology of carotid atheroma improves current risk stratification for predicting subsequent thrombo-embolic events. Previous magnetic resonance (MR) ex vivo studies have shown that diffusion-weighted imaging (DWI) can detect lipid-rich necrotic core (LR/NC) and fibrous cap. This study aims to establish if this is achievable in vivo. METHODS: Twenty-six patients (mean age 73 years, range 54-87 years) with moderate to severe carotid stenosis confirmed on ultrasound were imaged. An echo-planar DWI sequence was performed along with standard high-resolution MR imaging. Apparent diffusion coefficient (ADC) maps were evaluated. Two independent readers reported the mean ADC values from regions of interest defining LR/NCs and fibrous caps. For subjects undergoing carotid endarterectomy (n = 19), carotid specimens were obtained and stained using Nile red. RESULTS: The mean ADC values were 1.0 × 10(-3) mm(2)/s (±SD 0.3 × 10(-3) mm(2)/s) and 0.7 × 10(-3) mm(2)/s (±SD 0.2 × 10(-3) mm(2)/s) for fibrous cap and LR/NC, respectively; the difference was significant (p < 0.0001). The intra-class correlation coefficients summarising the agreement between the two independent readers were 0.84 and 0.60 for fibrous cap and LR/NC, respectively. Comparison of quantitative ADC values and histology (by subjective grading of lipid content) showed a significant correlation: heavier lipid staining matched lower ADC values (r = -0.435, p = 0.005). CONCLUSIONS: This study indicates that DWI can be used to distinguish LR/NC and the fibrous cap. The study also suggests that the mean ADC value may be linearly related to subjective graded LR/NC content determined by histology. More... »

PAGES

929-936

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00234-010-0680-y

DOI

http://dx.doi.org/10.1007/s00234-010-0680-y

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037879287

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/20358366


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44 schema:description INTRODUCTION: Research has shown that knowing the morphology of carotid atheroma improves current risk stratification for predicting subsequent thrombo-embolic events. Previous magnetic resonance (MR) ex vivo studies have shown that diffusion-weighted imaging (DWI) can detect lipid-rich necrotic core (LR/NC) and fibrous cap. This study aims to establish if this is achievable in vivo. METHODS: Twenty-six patients (mean age 73 years, range 54-87 years) with moderate to severe carotid stenosis confirmed on ultrasound were imaged. An echo-planar DWI sequence was performed along with standard high-resolution MR imaging. Apparent diffusion coefficient (ADC) maps were evaluated. Two independent readers reported the mean ADC values from regions of interest defining LR/NCs and fibrous caps. For subjects undergoing carotid endarterectomy (n = 19), carotid specimens were obtained and stained using Nile red. RESULTS: The mean ADC values were 1.0 × 10(-3) mm(2)/s (±SD 0.3 × 10(-3) mm(2)/s) and 0.7 × 10(-3) mm(2)/s (±SD 0.2 × 10(-3) mm(2)/s) for fibrous cap and LR/NC, respectively; the difference was significant (p < 0.0001). The intra-class correlation coefficients summarising the agreement between the two independent readers were 0.84 and 0.60 for fibrous cap and LR/NC, respectively. Comparison of quantitative ADC values and histology (by subjective grading of lipid content) showed a significant correlation: heavier lipid staining matched lower ADC values (r = -0.435, p = 0.005). CONCLUSIONS: This study indicates that DWI can be used to distinguish LR/NC and the fibrous cap. The study also suggests that the mean ADC value may be linearly related to subjective graded LR/NC content determined by histology.
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