Translocator positron-emission tomography and magnetic resonance spectroscopic imaging of brain glial cell activation in multiple sclerosis

Background: Multiple sclerosis (MS) is characterised by a diffuse inflammatory response mediated by microglia and astrocytes. Brain translocator protein (TSPO) positron-emission tomography (PET) and [myo-inositol] magnetic resonance spectroscopy (MRS) were used together to assess this. Objective: To explore the in vivo relationships between MRS and PET [11C]PBR28 in MS over a range of brain inflammatory burden. Methods: A total of 23 patients were studied. TSPO PET imaging with [11C]PBR28, single voxel MRS and conventional magnetic resonance imaging (MRI) sequences were undertaken. Disability was assessed by Expanded Disability Status Scale (EDSS) and Multiple Sclerosis Functional Composite (MSFC). Results: [11C]PBR28 uptake and [ myo-inositol] were not associated. When the whole cohort was stratified by higher [11C]PBR28 inflammatory burden, [ myo-inositol] was positively correlated to [11C]PBR28 uptake (Spearman’s ρ = 0.685, p = 0.014). Moderate correlations were found between [11C]PBR28 uptake and both MRS creatine normalised N-acetyl aspartate (NAA) concentration and grey matter volume. MSFC was correlated with grey matter volume (ρ = 0.535, p = 0.009). There were no associations between other imaging or clinical measures. Conclusion: MRS [ myo-inositol] and PET [11C]PBR28 measure independent inflammatory processes which may be more commonly found together with more severe inflammatory disease. Microglial activation measured by [11C]PBR28 uptake was associated with loss of neuronal integrity and grey matter atrophy.

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Inhibitory and excitatory neurotransmitter systems in depressed and healthy: a positron emission tomography and magnetic resonance spectroscopy study

Psychiatry Research Neuroimaging ◽

10.1016/j.pscychresns.2021.111327 ◽

2021 ◽

pp. 111327

Author(s):

Jonas Persson ◽

Anders Wall ◽

Jan Weis ◽

Malin Gingnell ◽

Gunnar Antoni ◽

...

Keyword(s):

Positron Emission Tomography ◽

Magnetic Resonance ◽

Magnetic Resonance Spectroscopy ◽

Emission Tomography ◽

Resonance Spectroscopy ◽

Spectroscopy Study ◽

Neurotransmitter Systems ◽

Excitatory Neurotransmitter ◽

Magnetic Resonance Spectroscopy Study ◽

Positron Emission

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Irradiation Effects on the Metabolism of Metastatic Brain Tumors: Analysis by Positron Emission Tomography and 1H-Magnetic Resonance Spectroscopy

Stereotactic and Functional Neurosurgery ◽

10.1159/000099816 ◽

1996 ◽

Vol 66 (1) ◽

pp. 240-259 ◽

Cited By ~ 19

Author(s):

E. Yoshino ◽

Y. Ohmori ◽

Y. Imahori ◽

T. Higuchi ◽

S. Furuya ◽

...

Keyword(s):

Positron Emission Tomography ◽

Magnetic Resonance ◽

Magnetic Resonance Spectroscopy ◽

Brain Tumors ◽

Emission Tomography ◽

Resonance Spectroscopy ◽

Metastatic Brain Tumors ◽

Irradiation Effects ◽

Positron Emission

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NIMG-12. 18F-FLUORETHYLTYROSINE POSITRON EMISSION TOMOGRAPHY VERSUS MAGNETIC RESONANCE SPECTROSCOPY IN PREOPERATIVE DETECTION OF NEWLY DIAGNOSED GLIOMAS BY USING MACHINE LEARNING

Neuro-Oncology ◽

10.1093/neuonc/noaa215.625 ◽

2020 ◽

Vol 22 (Supplement_2) ◽

pp. ii149-ii149

Author(s):

Lazaros Lazaridis ◽

Sied Kebir ◽

Manuel Weber ◽

Teresa Schmidt ◽

Kathy Keyvani ◽

...

Keyword(s):

Positron Emission Tomography ◽

Magnetic Resonance ◽

Magnetic Resonance Spectroscopy ◽

Emission Tomography ◽

Resonance Spectroscopy ◽

Newly Diagnosed ◽

Who Grade ◽

Fet Pet ◽

Positron Emission ◽

Grade Ii

Abstract BACKGROUND Advanced imaging techniques entered the field of neurooncology. In this analysis we compare the diagnostic potential of 18F-fluorethyltyrosine (FET) positron emission tomography (PET) and magnetic resonance spectroscopy (MRS) in their potential to preoperatively predict certain glioma subtypes. AIMS Goal of this analysis ist the evaluation of FET PET and MRS regarding the preoperative prediction of glioma subtypes. METHODS We analyzed 33 patients with histopathologically confirmed newly diagnosed glioma. The patients received FET PET and MRS during one single preoperative diagnostic session. According to the molecular portfolio patients were subdivided in IDH wildtype glioblastoma patients (GBM), IDH wildtype WHO grade II/III glioma patients (Astro_IDHwt), IDH mutant WHO grade II/III glioma patients without 1p/19q codeletion (Astro_IDHmut) and with 1p/19q codeletion (ODG). Mean and maximum tumor-to-brain ratio (TBRmean and TBRmax), N-acetylaspartate, choline and creatine peaks were correlated with postoperative tumor diagnosis. To gain generalizable implications we subdivided the study cohort into a development and validation subcohort. A support vector machine model was fitted to the development subcohort and evaluated on the validation subcohort. Receiver operating characteristic curve served to assess model performance. RESULTS GBM patients had highest TBRmax and TBRmean values (mean: 3.5 and 3.8) and the ODG patients showed the second highest TBRmax and TBRmean values (mean: 2.6 and 3). The distribution of MRS markers exhibited to clear trend. The performance of glioma subtyping was comparatively low for the TBR values (AUC: 0.68) and even lower for the MRS markers (AUC: 0.60). These results are in line with preliminary investigations performed by our institute for the comparison of 11C-methionine PET with MRS in preoperative glioma subtyping. CONCLUSIONS FET PET and MRS bear limited potential in glioma subgrouping. However, FET PET appears to be slightly superior. Investigation in a larger cohort is required to draw definite conclusions.

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