Abstract
Purpose
To quantify the influence of melanin content on magnetic susceptibility of cerebral melanoma metastases.
Methods
Patients with non-hemorrhagic metastases were included based on the absence of susceptibility blooming artifacts. Susceptibility maps were calculated from 3D gradient echo data, using Laplacian-based phase unwrapping, sophisticated harmonic artefact reduction for phase data (V-SHARP) with varying spherical kernel sizes for background field removal and the iLSQR algorithm for the inversion of phase data. Susceptibility maps were referenced to cerebrospinal fluid. Non-hemorrhagic metastases were identified on contrast-enhanced T1-weighted images and susceptibility weighted images. Metastases masks were drawn on T1-weighted post-contrast images and used to compute mean susceptibility values of each metastasis.
Results
A total of 33 non-hemorrhagic melanoma brain metastases in 20 patients were quantitatively evaluated. Metastases without and with hyperintense signal on T1-weighted images, which corresponds to the melanin content, showed median susceptibility values of −0.028 ppm and −0.020 ppm, respectively. The susceptibility differences between metastases without and with T1-weighted hyperintense signal was not statistically significant (p ≥ 0.05).
Conclusion
Non-hemorrhagic cerebral melanoma metastases showed weak diamagnetic susceptibility values and susceptibility did not significantly correlate to T1-weighted signals. Therefore, melanin does not seem to be a major contributor to susceptibility in cerebral melanoma metastases.
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S. Straub, F.B. Laun, M.T. Freitag, C. Kölsche, A. von Deimling, M. Denoix, M. Bendszus, H.-P. Schlemmer, M.E. Ladd and T.M. Schneider declare that they have no competing interests.
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Straub, S., Laun, F.B., Freitag, M.T. et al. Assessment of Melanin Content and its Influence on Susceptibility Contrast in Melanoma Metastases. Clin Neuroradiol 30, 607–614 (2020). https://doi.org/10.1007/s00062-019-00816-x
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DOI: https://doi.org/10.1007/s00062-019-00816-x