Modeling clustered activity increase in amyloid-beta positron emission tomographic images with statistical descriptors

Sepideh Shokouhi,1 Baxter P Rogers,1 Hakmook Kang,2 Zhaohua Ding,1 Daniel O Claassen,3 John W Mckay,1 William R Riddle1On behalf of the Alzheimer’s Disease Neuroimaging Initiative1Department of Radiology and Radiological Sciences, Vanderbilt University Institute of Imaging Science, 2Depart...

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Autores principales:	Shokouhi S, Rogers BP, Kang H, Ding Z, Claassen DO, Mckay JW, Riddle WR
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2015
Materias:	Amyloid-beta plaques positron emission tomography 11C-PIB statistical descriptors two-point correlation function Geriatrics RC952-954.6
Acceso en línea:	https://doaj.org/article/243cd04295fe46c3bf3f4a012df3fb7e
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spelling	oai:doaj.org-article:243cd04295fe46c3bf3f4a012df3fb7e2021-12-02T01:09:31ZModeling clustered activity increase in amyloid-beta positron emission tomographic images with statistical descriptors1178-1998https://doaj.org/article/243cd04295fe46c3bf3f4a012df3fb7e2015-04-01T00:00:00Zhttps://www.dovepress.com/modeling-clustered-activity-increase-in-amyloid-beta-positron-emission-peer-reviewed-article-CIAhttps://doaj.org/toc/1178-1998Sepideh Shokouhi,1 Baxter P Rogers,1 Hakmook Kang,2 Zhaohua Ding,1 Daniel O Claassen,3 John W Mckay,1 William R Riddle1On behalf of the Alzheimer’s Disease Neuroimaging Initiative1Department of Radiology and Radiological Sciences, Vanderbilt University Institute of Imaging Science, 2Department of Biostatistics, 3Department of Neurology, Vanderbilt University, Nashville, TN, USABackground: Amyloid-beta (Aβ) imaging with positron emission tomography (PET) holds promise for detecting the presence of Aβ plaques in the cortical gray matter. Many image analyses focus on regional average measurements of tracer activity distribution; however, considerable additional information is available in the images. Metrics that describe the statistical properties of images, such as the two-point correlation function (S2), have found wide applications in astronomy and materials science. S2 provides a detailed characterization of spatial patterns in images typically referred to as clustering or flocculence. The objective of this study was to translate the two-point correlation method into Aβ-PET of the human brain using 11C-Pittsburgh compound B (11C-PiB) to characterize longitudinal changes in the tracer distribution that may reflect changes in Aβ plaque accumulation.Methods: We modified the conventional S2 metric, which is primarily used for binary images and formulated a weighted two-point correlation function (wS2) to describe nonbinary, real-valued PET images with a single statistical function. Using serial 11C-PiB scans, we calculated wS2 functions from two-dimensional PET images of different cortical regions as well as three-dimensional data from the whole brain. The area under the wS2 functions was calculated and compared with the mean/median of the standardized uptake value ratio (SUVR). For three-dimensional data, we compared the area under the wS2 curves with the subjects’ cerebrospinal fluid measures.Results: Overall, the longitudinal changes in wS2 correlated with the increase in mean SUVR but showed lower variance. The whole brain results showed a higher inverse correlation between the cerebrospinal Aβ and wS2 than between the cerebrospinal Aβ and SUVR mean/median. We did not observe any confounding of wS2 by region size or injected dose.Conclusion: The wS2 detects subtle changes and provides additional information about the binding characteristics of radiotracers and Aβ accumulation that are difficult to verify with mean SUVR alone.Keywords: amyloid-beta plaques, positron emission tomography, 11C-Pittsburgh compound B, statistical descriptors, two-point correlation functionShokouhi SRogers BPKang HDing ZClaassen DOMckay JWRiddle WRDove Medical PressarticleAmyloid-beta plaquespositron emission tomography11C-PIBstatistical descriptorstwo-point correlation functionGeriatricsRC952-954.6ENClinical Interventions in Aging, Vol Volume 10, Pp 759-770 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	Amyloid-beta plaques positron emission tomography 11C-PIB statistical descriptors two-point correlation function Geriatrics RC952-954.6
spellingShingle	Amyloid-beta plaques positron emission tomography 11C-PIB statistical descriptors two-point correlation function Geriatrics RC952-954.6 Shokouhi S Rogers BP Kang H Ding Z Claassen DO Mckay JW Riddle WR Modeling clustered activity increase in amyloid-beta positron emission tomographic images with statistical descriptors
description	Sepideh Shokouhi,1 Baxter P Rogers,1 Hakmook Kang,2 Zhaohua Ding,1 Daniel O Claassen,3 John W Mckay,1 William R Riddle1On behalf of the Alzheimer’s Disease Neuroimaging Initiative1Department of Radiology and Radiological Sciences, Vanderbilt University Institute of Imaging Science, 2Department of Biostatistics, 3Department of Neurology, Vanderbilt University, Nashville, TN, USABackground: Amyloid-beta (Aβ) imaging with positron emission tomography (PET) holds promise for detecting the presence of Aβ plaques in the cortical gray matter. Many image analyses focus on regional average measurements of tracer activity distribution; however, considerable additional information is available in the images. Metrics that describe the statistical properties of images, such as the two-point correlation function (S2), have found wide applications in astronomy and materials science. S2 provides a detailed characterization of spatial patterns in images typically referred to as clustering or flocculence. The objective of this study was to translate the two-point correlation method into Aβ-PET of the human brain using 11C-Pittsburgh compound B (11C-PiB) to characterize longitudinal changes in the tracer distribution that may reflect changes in Aβ plaque accumulation.Methods: We modified the conventional S2 metric, which is primarily used for binary images and formulated a weighted two-point correlation function (wS2) to describe nonbinary, real-valued PET images with a single statistical function. Using serial 11C-PiB scans, we calculated wS2 functions from two-dimensional PET images of different cortical regions as well as three-dimensional data from the whole brain. The area under the wS2 functions was calculated and compared with the mean/median of the standardized uptake value ratio (SUVR). For three-dimensional data, we compared the area under the wS2 curves with the subjects’ cerebrospinal fluid measures.Results: Overall, the longitudinal changes in wS2 correlated with the increase in mean SUVR but showed lower variance. The whole brain results showed a higher inverse correlation between the cerebrospinal Aβ and wS2 than between the cerebrospinal Aβ and SUVR mean/median. We did not observe any confounding of wS2 by region size or injected dose.Conclusion: The wS2 detects subtle changes and provides additional information about the binding characteristics of radiotracers and Aβ accumulation that are difficult to verify with mean SUVR alone.Keywords: amyloid-beta plaques, positron emission tomography, 11C-Pittsburgh compound B, statistical descriptors, two-point correlation function
format	article
author	Shokouhi S Rogers BP Kang H Ding Z Claassen DO Mckay JW Riddle WR
author_facet	Shokouhi S Rogers BP Kang H Ding Z Claassen DO Mckay JW Riddle WR
author_sort	Shokouhi S
title	Modeling clustered activity increase in amyloid-beta positron emission tomographic images with statistical descriptors
title_short	Modeling clustered activity increase in amyloid-beta positron emission tomographic images with statistical descriptors
title_full	Modeling clustered activity increase in amyloid-beta positron emission tomographic images with statistical descriptors
title_fullStr	Modeling clustered activity increase in amyloid-beta positron emission tomographic images with statistical descriptors
title_full_unstemmed	Modeling clustered activity increase in amyloid-beta positron emission tomographic images with statistical descriptors
title_sort	modeling clustered activity increase in amyloid-beta positron emission tomographic images with statistical descriptors
publisher	Dove Medical Press
publishDate	2015
url	https://doaj.org/article/243cd04295fe46c3bf3f4a012df3fb7e
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_version_	1718403242859167744

Modeling clustered activity increase in amyloid-beta positron emission tomographic images with statistical descriptors

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