- Poster presentation
- Open Access
Association between wall metrics and identification of lipid-rich necrotic core in the early-stage atherosclerosis using magnetic resonance imaging
© Dong et al; licensee BioMed Central Ltd. 2009
- Published: 28 January 2009
- Carotid Atherosclerosis
- Wall Area
- Metrics Measurement
- Wall Metrics
- Maximum Wall Thickness
Detection of early-stage of carotid atherosclerosis is important for stroke prevention. We sought to explore reliability of wall metrics measurements by high resolution MRI in a population of patients with early-stage carotid atherosclerosis.
Subjects (n = 106) recruited from an ongoing clinical trial underwent carotid MRI scans (1.5 T GE scanner) using a high-resolution multi-sequence protocol. Artery metrics measurements, which include maximum wall thickness (MaxWT), mean wall thickness (MWT), normalized wall index (NWI = WA/[LA + WA]), and wall area (WA), were recorded after the lumen and outer wall boundary were identified. Intraclass coefficient (ICC) was used to assess intra- and inter-reader agreements for measurement of the MaxWT, MWT, NWI, and WA. The lipid-rich necrotic core (LRNC) was identified as non-enhancing area on the contrast-enhanced T1-weighted images with exclusion of calcification by multi-sequence images. A spearman correlation coefficient was used to correlate Occurrence of LRNC with artery metrics measurements. Prevalence of LRNC was categorized by NWI in quartiles.
Proportion of lipid-rich necrotic core across normalized wall index.
P value (comparing to the 4th quartile)
1st quartile (<= 0.36)
2nd quartile (0.37–0.39)
3rd quartile (0.40–0.45)
4th quartile (> 0.45)
Small mean LRNC areas found in this study indicate that this study population has early-stage of carotid atherosclerosis. Excellent inter- and intra-reader ICC's suggest that MRI is reliable tool for the evaluation of carotid artery wall metrics. Good correlation between wall metrics measurements and LRNC suggests wall metrics reflect the plaque burden. In particular, NWI can be used to assess prevalence of LRNC in subjects with early-stage carotid atherosclerosis.
This article is published under license to BioMed Central Ltd.