title: Comparison of amyloid plaque contrast generated by T2-weighted, T2*-weighted, and susceptibility-weighted imaging methods in transgenic mouse models of Alzheimer's disease.
abstract: One of the hallmark pathologies of Alzheimer's disease (AD) is amyloid plaque deposition. Plaques appear hypointense on T(2)-weighted and T(2)*-weighted MR images probably due to the presence of endogenous iron, but no quantitative comparison of various imaging techniques has been reported. We estimated the T(1), T(2), T(2)*, and proton density values of cortical plaques and normal cortical tissue and analyzed the plaque contrast generated by a collection of T(2)-weighted, T(2)*-weighted, and susceptibility-weighted imaging (SWI) methods in ex vivo transgenic mouse specimens. The proton density and T(1) values were similar for both cortical plaques and normal cortical tissue. The T(2) and T(2)* values were similar in cortical plaques, which indicates that the iron content of cortical plaques may not be as large as previously thought. Ex vivo plaque contrast was increased compared to a previously reported spin-echo sequence by summing multiple echoes and by performing SWI; however, gradient echo and SWI were found to be impractical for in vivo imaging due to susceptibility interface-related signal loss in the cortex.
authors.affiliation: Center for Magnetic Resonance Research, University of Minnesota Medical School, Minneapolis, Minnesota, USA.
authors.forename: Ryan
authors.initials: R
authors.lastname: Chamberlain
authors.forename: Denise
authors.initials: D
authors.lastname: Reyes
authors.forename: Geoffrey L
authors.initials: GL
authors.lastname: Curran
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Marjanska
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Wengenack
authors.forename: Joseph F
authors.initials: JF
authors.lastname: Poduslo
authors.forename: Michael
authors.initials: M
authors.lastname: Garwood
authors.forename: Clifford R
authors.initials: CR
authors.lastname: Jack
mesh_terms: D000465:Algorithms; D000544:Alzheimer Disease / Q000175:diagnosis*; D016229:Amyloid beta-Peptides / Q000235:genetics; D000818:Animals; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D004195:Disease Models, Animal; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D051379:Mice; D008822:Mice, Transgenic; D058225:Plaque, Amyloid / Q000473:pathology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D016229:Amyloid beta-Peptides