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CEST MRI quantification procedures for breast cancer treatment-related lymphedema therapy evaluation

Resource type
Authors/contributors
Title
CEST MRI quantification procedures for breast cancer treatment-related lymphedema therapy evaluation
Abstract
Purpose To quantify chemical exchange saturation transfer contrast in upper extremities of participants with lymphedema before and after standardized lymphatic mobilization therapy using correction procedures for B0 and B1 heterogeneity, and T1 relaxation. Methods Females with (n = 12) and without (n = 17) breast cancer treatment-related lymphedema (BCRL) matched for age and body mass index were scanned at 3.0T MRI. B1 efficiency and T1 were calculated in series with chemical exchange saturation transfer in bilateral axilla (B1 amplitude = 2µT, Δω = ±5.5 ppm, slices = 9, spatial resolution = 1.8 × 1.47 × 5.5 mm3). B1 dispersion measurements (B1 = 1-3 µT; increment = 0.5 µT) were performed in controls (n = 6 arms in 3 subjects). BCRL participants were scanned pre- and post-manual lymphatic drainage (MLD) therapy. Chemical exchange saturation transfer amide proton transfer (APT) and nuclear Overhauser effect (NOE) metrics corrected for B1 efficiency were calculated, including proton transfer ratio (PTR'), magnetization transfer ratio asymmetry , and apparent exchange-dependent relaxation (AREX'). Nonparametric tests were used to evaluate relationships between metrics in BCRL participants pre- versus post-MLD (two-sided P < 0.05 required for significance). Results B1 dispersion experiments showed nonlinear dependence of Z-values on B1 efficiency in the upper extremities; PTR' showed < 1% mean fractional difference between subject-specific and group-level correction procedures. PTR'APT significantly correlated with T1 (Spearman's rho = 0.57, P < 0.001) and body mass index (Spearman's rho = −0.37, P = 0.029) in controls and with lymphedema stage (Spearman's rho = 0.48, P = 0.017) in BCRL participants. Following MLD therapy, PTR'APT significantly increased in the affected arm of BCRL participants (pre- vs. post-MLD: 0.41 ± 0.05 vs. 0.43 ± 0.03, P = 0.02), consistent with treatment effects from mobilized lymphatic fluid. Conclusion Chemical exchange saturation transfer metrics, following appropriate correction procedures, respond to lymphatic mobilization therapies and may have potential for evaluating treatments in participants with secondary lymphedema.
Publication
Magnetic Resonance in Medicine
Volume
83
Issue
5
Pages
1760-1773
Date
2020
Language
en
ISSN
1522-2594
Accessed
10/20/20, 2:24 AM
Library Catalog
Wiley Online Library
Rights
© 2019 International Society for Magnetic Resonance in Medicine
Lipedema Foundation Award
LF12, LF02
Citation
Crescenzi, R., Donahue, P. M. C., Mahany, H., Lants, S. K., & Donahue, M. J. (2020). CEST MRI quantification procedures for breast cancer treatment-related lymphedema therapy evaluation. Magnetic Resonance in Medicine, 83(5), 1760–1773. https://doi.org/10.1002/mrm.28031
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