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Summary
This summary is machine-generated.

Diffusion kurtosis imaging (DKI) reveals microstructural changes in the amygdala of individuals with subjective cognitive decline (SCD). These changes, particularly higher mean kurtosis (MK), are linked to increased neurite density, suggesting potential dendritic or glial alterations.

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Area of Science:

  • Neuroimaging
  • Neurodegenerative Diseases
  • Brain Microstructure

Background:

  • Prior diffusion kurtosis imaging (DKI) studies indicated altered amygdala microstructure in subjective cognitive decline (SCD).
  • Specific microstructural drivers of these DKI changes (decreased kurtosis fractional anisotropy [KFA], increased mean kurtosis [MK]) in SCD remain unclear.
  • This study investigates associations between DKI metrics and more specific microstructural markers from neurite orientation dispersion and density imaging (NODDI) and magnetization transfer imaging (MTI).

Purpose of the Study:

  • To assess the relationship between DKI metrics (MK, KFA) and NODDI (neurite density [ND], orientation dispersion [OD]) and MTI (magnetization transfer ratio [MTR]) metrics in the amygdala.
  • To elucidate the microstructural underpinnings of previously observed DKI alterations in SCD.
  • To determine the sensitivity of different imaging techniques to amygdala changes in SCD.

Main Methods:

  • 175 participants (75 with SCD) aged 55-88 underwent DKI, NODDI, and MTI.
  • DKI provided MK, Radial Kurtosis (RK), Axial Kurtosis (AK), and KFA.
  • NODDI provided ND and OD; MTI provided MTR. Mean values were computed for bilateral amygdala, and associations were examined using linear models.

Main Results:

  • SCD individuals exhibited lower KFA, higher MK, and higher RK in the right amygdala compared to controls.
  • KFA showed a weak negative correlation with ND; MK and RK demonstrated strong positive correlations with ND.
  • MK was weakly positively correlated with OD, but no significant correlations were found between DKI metrics and MTR.

Conclusions:

  • DKI metrics are more sensitive to amygdala alterations in SCD than NODDI or MTI.
  • Observed associations suggest increased neurite density (dendritic or glial branching) underlies higher MK and RK in SCD.
  • Higher MK may also indicate reduced neurite organization (higher OD), warranting further investigation into SCD-related neuropsychiatric symptoms.