Longitudinal progression of White Matter Hyperintensities (WMH)
At a glance
- Project leader : Dr. Robert Vorburger
- Project team : Petra Irène Lustenberger
- Project budget : CHF 30'000
- Project status : completed
- Funding partner : Internal
- Project partner : Columbia University (Taub Institute for Research on Alzheimer's Disease and the Aging Brain)
- Contact person : Robert Vorburger
Description
According to the latest figures from Alzheimer Switzerland,
there are currently 48,242 women and 15,711 men aged 85 years and
older living with dementia in Switzerland. So-called White Matter
Hyperintensities (WMH), which can be measured in MRI images of the
brains white matter, are distinct biomarkers of dementia
diseases.
The techniques currently used to quantitatively determine WMH allow
statements such as "Mr. Meier has more WMH in the visual cortex
than Mr. Miller". However, the quantitative change of WMH over
time, which would allow important conclusions to be drawn about the
course of the disease, is not possible with the current state of
the art. Statements such as "The volume of WMH in Mr. Müller's
visual cortex has increased by 12% in the last 6 months" still
cannot be estimated quantitatively, but only qualitatively through
visual inspections by radiologists.
In this project, an intelligent algorithm for determining the
longitudinal change of WMH is to be developed. The following
difficulties shall be addressed:
- The coregistration of the data sets from different points in time must be normalized.
- The change in the volume of the WMH can be very small and requires an accuracy and precision not achieved so far. Simple differences are not sufficient, since the WMH change morphologically.
- The threshold for the dichotomous identification of the WMH is based on the individual intensity distribution of a data set.
- For longitudinal comparisons an overall threshold must be
found, because even with the same acquisition sequence the average
intensity varies.
The algorithm will then be used in various studies to investigate the relationship between morphological changes in the WHM and the course of dementia.