Institute of Biometry and Medical Informatics, Otto-von-Guericke University Magdeburg, Leipziger Strasse 44, 39120, Magdeburg, Germany.
Pure Devices GmbH, 97222, Rimpar, Germany.
Sci Rep. 2024 Jan 17;14(1):1527. doi: 10.1038/s41598-024-51454-4.
In biological tissues, F magnetic resonance (MR) enables the non-invasive, background-free detection of F-containing biomarkers. However, the signal-to-noise ratio (SNR) is usually low because biomarkers are typically present at low concentrations. Measurements at low magnetic fields further reduce the SNR. In a proof-of-principal study we applied LED-based photo-chemically induced dynamic nuclear polarization (photo-CIDNP) to amplify the F signal at 0.6 T. For the first time, F MR imaging (MRI) and spectroscopy (MRS) of a fully biocompatible model system containing the antiviral drug favipiravir has been successfully performed. This fluorinated drug has been used to treat Ebola and COVID-19. Since the partially cyclic reaction scheme for photo-CIDNP allows for multiple data acquisitions, averaging further improved the SNR. The mean signal gain factor for F has been estimated to be in the order of 10. An in-plane resolution of 0.39 × 0.39 mm enabled the analysis of spatially varying degrees of hyperpolarization. The minimal detectable amount of favipiravir per voxel was estimated to about 500 pmol. The results show that F photo-CIDNP is a promising method for the non-invasive detection of suitable F-containing drugs and other compounds with very low levels of the substance.
在生物组织中,F 磁共振(MR)能够非侵入式、无背景地检测含 F 的生物标志物。然而,由于生物标志物通常浓度较低,因此信号噪声比(SNR)通常较低。在较低磁场下进行测量会进一步降低 SNR。在一项原理验证研究中,我们应用基于 LED 的光化学诱导动态核极化(photo-CIDNP)在 0.6T 下放大 F 信号。首次成功地对含有抗病毒药物法匹拉韦的完全生物相容模型系统进行了 F 磁共振成像(MRI)和光谱(MRS)研究。这种氟化药物已被用于治疗埃博拉病毒和 COVID-19。由于 photo-CIDNP 的部分循环反应方案允许多次数据采集,因此平均化进一步提高了 SNR。F 的平均信号增益因子估计在 10 左右。0.39×0.39mm 的面内分辨率能够分析空间变化的极化程度。估计每个体素中最小可检测的法匹拉韦量约为 500pmol。结果表明,F photo-CIDNP 是一种很有前途的方法,可用于非侵入式检测合适的含 F 药物和其他物质含量非常低的化合物。