title: Diagnostic utility of ASL-MRI and FDG-PET in the behavioral variant of FTD and AD.
abstract: To compare the values of arterial spin-labeled (ASL) MRI and fluorodeoxyglucose (FDG) PET in the diagnosis of behavioral variant of frontotemporal dementia (bvFTD) and Alzheimer's disease (AD).
  
  
  
  Partial least squares logistic regression was used to identify voxels with diagnostic value in cerebral blood flow (CBF) and cerebral metabolic rate of glucose (CMRgl) maps from patients with bvFTD (n= 32) and AD (n= 28), who were compared with each other and with cognitively normal controls (CN,n= 15). Diagnostic values of these maps were compared with each other.
  
  
  
  Regions that differentiated each disorder from controls were similar for CBF and CMRgl. For differentiating AD from CN, the areas under the curve (AUC) for CBF (0.89) and CMRgl (0.91) were similar, with similar sensitivity (CBF: 86%, CMRgl: 78%) and specificity (CBF: 92%, CMRgl: 100%). Likewise, for differentiating bvFTD from CN performances of CBF (AUC = 0.83) and CMRgl (AUC = 0.85) were equivalent, with similar sensitivity (CBF: 78%, CMRgl: 79%) and specificity (CBF: 92%, CMRgl: 100%). In differentiating bvFTD from AD, classification was again similar for CBF (AUC = 0.87) and CMRgl (AUC = 0.79), as were sensitivity (CBF: 83%, CMRgl: 89%) and specificity (CBF: 93%, CMRgl: 78%). None of the differences in any performance measure were statistically significant.
  
  
  
  ASL-MRI has similar diagnostic utility as FDG-PET in the diagnosis of AD and bvFTD. Continued development of ASL-MRI as a diagnostic tool for neurodegenerative dementias is warranted.
authors.affiliation: Department of Radiology and Biomedical Imaging University of California San Francisco California.
authors.forename: Duygu
authors.initials: D
authors.lastname: Tosun
authors.affiliation: Department of Radiology and Biomedical Imaging University of California San Francisco California.
authors.forename: Norbert
authors.initials: N
authors.lastname: Schuff
authors.affiliation: Memory and Aging Center Department of Neurology University of California San Francisco California.
authors.forename: Gil D
authors.initials: GD
authors.lastname: Rabinovici
authors.affiliation: Memory and Aging Center Department of Neurology University of California San Francisco California; School of Public Health University of California Berkeley California.
authors.forename: Nagehan
authors.initials: N
authors.lastname: Ayakta
authors.affiliation: Memory and Aging Center Department of Neurology University of California San Francisco California.
authors.forename: Bruce L
authors.initials: BL
authors.lastname: Miller
authors.affiliation: School of Public Health University of California Berkeley California.
authors.forename: William
authors.initials: W
authors.lastname: Jagust
authors.affiliation: Memory and Aging Center Department of Neurology University of California San Francisco California.
authors.forename: Joel
authors.initials: J
authors.lastname: Kramer
authors.affiliation: Department of Radiology and Biomedical Imaging University of California San Francisco California.
authors.forename: Michael M
authors.initials: MM
authors.lastname: Weiner
authors.affiliation: Memory and Aging Center Department of Neurology University of California San Francisco California.
authors.forename: Howard J
authors.initials: HJ
authors.lastname: Rosen