» Articles » PMID: 22588187

Optimization of Supervised Cluster Analysis for Extracting Reference Tissue Input Curves in (R)-[(11)C]PK11195 Brain PET Studies

Overview
Authors
Affiliations
Soon will be listed here.
Abstract

Performance of two supervised cluster analysis (SVCA) algorithms for extracting reference tissue curves was evaluated to improve quantification of dynamic (R)-[(11)C]PK11195 brain positron emission tomography (PET) studies. Reference tissues were extracted from images using both a manually defined cerebellum and SVCA algorithms based on either four (SVCA4) or six (SVCA6) kinetic classes. Data from controls, mild cognitive impairment patients, and patients with Alzheimer's disease were analyzed using various kinetic models including plasma input, the simplified reference tissue model (RPM) and RPM with vascular correction (RPMV(b)). In all subject groups, SVCA-based reference tissue curves showed lower blood volume fractions (V(b)) and volume of distributions than those based on cerebellum time-activity curve. Probably resulting from the presence of specific signal from the vessel walls that contains in normal condition a significant concentration of the 18 kDa translocation protein. Best contrast between subject groups was seen using SVCA4-based reference tissues as the result of a lower number of kinetic classes and the prior removal of extracerebral tissues. In addition, incorporation of V(b) in RPM improved both parametric images and binding potential contrast between groups. Incorporation of V(b) within RPM, together with SVCA4, appears to be the method of choice for analyzing cerebral (R)-[(11)C]PK11195 neurodegeneration studies.

Citing Articles

Cerebral Microbleeds and Their Association With Inflammation and Blood-Brain Barrier Leakage in Small Vessel Disease.

Cai L, Tozer D, Markus H Stroke. 2025; 56(2):427-436.

PMID: 39744850 PMC: 11771357. DOI: 10.1161/STROKEAHA.124.048974.


TSPO Radioligands for Neuroinflammation: An Overview.

Salerno S, Viviano M, Baglini E, Poggetti V, Giorgini D, Castagnoli J Molecules. 2024; 29(17).

PMID: 39275061 PMC: 11397380. DOI: 10.3390/molecules29174212.


Blood inflammation relates to neuroinflammation and survival in frontotemporal lobar degeneration.

Malpetti M, Swann P, Tsvetanov K, Chouliaras L, Strauss A, Chikaura T Brain. 2024; 148(2):493-505.

PMID: 39155063 PMC: 7617268. DOI: 10.1093/brain/awae269.


MINocyclinE to Reduce inflammation and blood-brain barrier leakage in small Vessel diseAse (MINERVA): A phase II, randomized, double-blind, placebo-controlled experimental medicine trial.

Brown R, Tozer D, Loubiere L, Harshfield E, Hong Y, Fryer T Alzheimers Dement. 2024; 20(6):3852-3863.

PMID: 38629936 PMC: 11180856. DOI: 10.1002/alz.13830.


Evaluation of Non-Invasive Methods for (R)-[C]PK11195 PET Image Quantification in Multiple Sclerosis.

Mantovani D, Pitombeira M, Schuck P, de Araujo A, Buchpiguel C, Faria D J Imaging. 2024; 10(2).

PMID: 38392087 PMC: 10889702. DOI: 10.3390/jimaging10020039.


References
1.
Maes F, Collignon A, Vandermeulen D, Marchal G, Suetens P . Multimodality image registration by maximization of mutual information. IEEE Trans Med Imaging. 1997; 16(2):187-98. DOI: 10.1109/42.563664. View

2.
Banati R, Newcombe J, Gunn R, Cagnin A, Turkheimer F, Heppner F . The peripheral benzodiazepine binding site in the brain in multiple sclerosis: quantitative in vivo imaging of microglia as a measure of disease activity. Brain. 2000; 123 ( Pt 11):2321-37. DOI: 10.1093/brain/123.11.2321. View

3.
Boellaard R, van Lingen A, van Balen S, Hoving B, Lammertsma A . Characteristics of a new fully programmable blood sampling device for monitoring blood radioactivity during PET. Eur J Nucl Med. 2001; 28(1):81-9. DOI: 10.1007/s002590000405. View

4.
van Berckel B, Bossong M, Boellaard R, Kloet R, Schuitemaker A, Caspers E . Microglia activation in recent-onset schizophrenia: a quantitative (R)-[11C]PK11195 positron emission tomography study. Biol Psychiatry. 2008; 64(9):820-2. DOI: 10.1016/j.biopsych.2008.04.025. View

5.
Cagnin A, Brooks D, Kennedy A, Gunn R, Myers R, Turkheimer F . In-vivo measurement of activated microglia in dementia. Lancet. 2001; 358(9280):461-7. DOI: 10.1016/S0140-6736(01)05625-2. View