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Related Experiment Video

Updated: Dec 6, 2025

Detecting Amyloid-β Accumulation via Immunofluorescent Staining in a Mouse Model of Alzheimer's Disease
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PET amyloid in normal aging: direct comparison of visual and automatic processing methods.

Sven Haller1,2,3, Marie-Louise Montandon4,5, Johan Lilja6,7,8

  • 1CIRD Centre d'imagerie Rive Droite, Geneva, Switzerland. sven.haller@me.com.

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|October 8, 2020
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Summary
This summary is machine-generated.

The novel Aβ-index method for assessing amyloid deposits in elders is operator-independent and correlates with cognitive decline, making it superior to visual or SUVR methods for Alzheimer

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Area of Science:

  • Neurology
  • Radiology
  • Biomarkers

Background:

  • Amyloid deposit assessment is crucial for identifying Alzheimer disease (AD) signatures in asymptomatic individuals.
  • The impact of different amyloid processing methods on clinico-radiological correlations remains unclear.
  • Standard visual reading is operator-dependent, while automatic SUVR requires reference regions.

Purpose of the Study:

  • To compare three amyloid processing methods: visual reading, automatic SUVR, and the novel Aβ-index.
  • To evaluate the impact of these methods on clinico-radiological correlations in asymptomatic elders.
  • To determine the optimal method for assessing amyloid burden and its relation to cognitive changes.

Main Methods:

  • 155 elderly controls underwent neuropsychological testing and amyloid deposit assessment.
  • Three methods were compared: operator-dependent visual reading, operator-independent automatic SUVR (four reference regions), and a novel operator/reference-independent Aβ-index.
  • Inter-individual variability was assessed using the coefficient of variance.
  • Clinico-radiological correlation was evaluated using ROC curves and linear regression models.

Main Results:

  • The Aβ-index demonstrated the lowest coefficient of variance, indicating reduced inter-individual variability.
  • The Aβ-index achieved the largest area under the ROC curve (0.9568) compared to visual rating.
  • The Aβ-index was the only method significantly associated with cognitive performance decline over 4.5 years.

Conclusions:

  • The operator-independent Aβ-index is a preferred method for amyloid assessment in asymptomatic elders.
  • This novel method avoids reference region selection and shows strong correlation with visual scoring.
  • The Aβ-index effectively correlates with the evolution of cognitive performance, aiding in early AD detection.