Journal
CONTRAST MEDIA & MOLECULAR IMAGING
Volume 11, Issue 6, Pages 544-549Publisher
WILEY-HINDAWI
DOI: 10.1002/cmmi.1716
Keywords
lymph nodes; lymphatic metastasis; magnetite nanoparticles; rabbits; ferumoxtran-10
Funding
- Radiology Research Foundation Program of College of Medicine at the Catholic University of Korea
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Ultrasmallsuperparamagnetic iron oxide (USPIO) has been suggested to be a negative MR contrast agent to detect metastatic lymph nodes. Previously reported studies have evaluated the diagnostic performance of USPIO-enhanced MR lymph node imaging based on signal intensity. In this study, we investigate the specific performance of three different parametric approaches (normalized signal intensity, R-2* and susceptibility) using 3D multi-echo gradient echo to quantify the USPIO particles in lymph nodes. Nine rabbits with VX2 tumor implants were scanned before and after USPIO injection. From 3D multi-echo GRE magnitude and phase data, we generated multi-echo combined T-2*-weighted images, an R-2* map, and a quantitative susceptibility map. Eighteen lymph nodes (nine reactive and nine metastatic) were evaluated and showed remarkable signal drops in the area of USPIO accumulation. On parametric analysis, the R-2* difference before and after USPIO injection was significantly different (p<0.05) between reactive and metastatic lymph nodes; in contrast, the normalized signal intensity and susceptibility were not significantly different between the nodes. Our study showed the potential utility of USPIO-enhanced MRI using R2* mapping from 3D multi-echo GRE for the detection of lymph node metastasis and parametric analysis of lymph node status in a rabbit model. Copyright (c) 2016 John Wiley & Sons, Ltd.
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