Evaluation of Non-Invasive Methods for (R)-[<SUP>11</SUP>C]PK11195 PET Image Quantification in Multiple Sclerosis
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Citações na Scopus
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Tipo de produção
article
Data de publicação
2024
Título da Revista
ISSN da Revista
Título do Volume
Editora
MDPI
Autores
SCHUCK, Phelipi N.
ARAUJO, Adriel S. de
Citação
JOURNAL OF IMAGING, v.10, n.2, article ID 39, 14p, 2024
Resumo
This study aims to evaluate non-invasive PET quantification methods for (R)-[C-11]PK11195 uptake measurement in multiple sclerosis (MS) patients and healthy controls (HC) in comparison with arterial input function (AIF) using dynamic (R)-[C-11]PK11195 PET and magnetic resonance images. The total volume of distribution (VT) and distribution volume ratio (DVR) were measured in the gray matter, white matter, caudate nucleus, putamen, pallidum, thalamus, cerebellum, and brainstem using AIF, the image-derived input function (IDIF) from the carotid arteries, and pseudo-reference regions from supervised clustering analysis (SVCA). Uptake differences between MS and HC groups were tested using statistical tests adjusted for age and sex, and correlations between the results from the different quantification methods were also analyzed. Significant DVR differences were observed in the gray matter, white matter, putamen, pallidum, thalamus, and brainstem of MS patients when compared to the HC group. Also, strong correlations were found in DVR values between non-invasive methods and AIF (0.928 for IDIF and 0.975 for SVCA, p < 0.0001). On the other hand, (R)-[C-11]PK11195 uptake could not be differentiated between MS patients and HC using VT values, and a weak correlation (0.356, p < 0.0001) was found between VTAIF and VTIDIF. Our study shows that the best alternative for AIF is using SVCA for reference region modeling, in addition to a cautious and appropriate methodology.
Palavras-chave
TSPO, neuroinflammation, kinetic modelling, quantification, image-derived input function
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