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http://dx.doi.org/10.7742/jksr.2022.16.2.103

Evaluation of Combined Contrast Agent using N-(p-maleimidophenyl) Isocyanate Linker-mediated Synthesis for Simultaneous PET-MRI  

Lee, Gil-Jae (Department of Biomedical Engineering, Graduate School of Chungbuk National University)
Lee, Hwun-Jae (Department of Radiology, College of Medicine, Yonsei University)
Lee, Tae-Soo (Department of Biomedical Engineering, Graduate School of Chungbuk National University)
Publication Information
Journal of the Korean Society of Radiology / v.16, no.2, 2022 , pp. 103-113 More about this Journal
Abstract
In this paper, a combined 18F-FDG(fluorodeoxyglucose) and MNP(magnetic nanoparticles) contrast agent was synthesized using N-(p-maleimidophenyl) isocyanate as the crosslinker for use in simultaneous PET-MRI scans. PET-MRI images were acquired and evaluated before and after injection of the combined contrast imaging agent (18F-FDG labeled MNP) from a glioma stem cell mouse model. After setting the region of interest (ROI) on each acquired image, the area of the lesion was calculated by segmentation. As a result, the PET image was larger than the MRI. In particular, the simultaneous PET-MRI images showed accurate lesions along with the surrounding soft tissue. The mean and standard deviation values were higher in the MRI images alone than in the PET images or the simultaneous PET-MRI images, regardless of whether the contrast agent was injected. In addition, the simultaneous PET-MRI image values were higher than for the PET images. For PSNR experiments, the original image was PET Image using 18F-FDG, MRI using MNPs, and MRI without contrast medium, and the target image was simultaneous PET-MRI image using 18F-FDG labeled MNPs contrast medium. As a result, all of them appeared significantly, suggesting that the 18F-FDG labeled MNPs contrast medium is useful. Future research is needed to develop an agent that can simultaneously diagnose and treat through SPECT-MRI imaging research that can use various nuclides.
Keywords
Simultaneous PET-MRI; Imaging agents; Evaluation contrast effect; Image processing; PSNR; Magnetic resonance imaging;
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