Patient-specific detection of perfusion abnormalities combining within-subject and between-subject variances in Arterial Spin Labeling - Inserm - Institut national de la santé et de la recherche médicale Access content directly
Journal Articles NeuroImage Year : 2013

Patient-specific detection of perfusion abnormalities combining within-subject and between-subject variances in Arterial Spin Labeling

Abstract

In this paper, patient-specific perfusion abnormalities in Arterial Spin Labeling (ASL) were identified by comparing a single patient to a group of healthy controls using a mixed-effect hierarchical General Linear Model (GLM). Two approaches are currently in use to solve hierarchical GLMs: (1) the homoscedastic approach assumes homogeneous variances across subjects and (2) the heteroscedastic approach is theoretically more efficient in the presence of heterogeneous variances but algorithmically more demanding. In practice, in functional magnetic resonance imaging studies, the superiority of the heteroscedastic approach is still under debate. Due to the low signal-to-noise ratio of ASL sequences, within-subject variances have a significant impact on the estimated perfusion maps and the heteroscedastic model might be better suited in this context. In this paper we studied how the homoscedastic and heteroscedastic approaches behave in terms of specificity and sensitivity in the detection of patient-specific ASL perfusion abnormalities. Validation was undertaken on a dataset of 25 patients diagnosed with brain tumors and 36 healthy volunteers. We showed evidence of heterogeneous within-subject variances in ASL and pointed out an increased false positive rate of the homoscedastic model. In the detection of patient-specific brain perfusion abnormalities with ASL, modeling heterogeneous variances increases the sensitivity at the same specificity level.
Fichier principal
Vignette du fichier
Maumet_NeuroImage_2013.pdf (2.15 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

inserm-00816852 , version 1 (12-06-2013)

Identifiers

Cite

Camille Maumet, Pierre Maurel, Jean-Christophe Ferré, Béatrice Carsin, Christian Barillot. Patient-specific detection of perfusion abnormalities combining within-subject and between-subject variances in Arterial Spin Labeling. NeuroImage, 2013, 81C, pp.121-130. ⟨10.1016/j.neuroimage.2013.04.079⟩. ⟨inserm-00816852⟩
336 View
393 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More