American Journal of Neuroradiology 27:875-878, April 2006
© 2006 American Society of Neuroradiology
BRAIN
Measuring Longitudinal White Matter Changes: Comparison of a Visual Rating Scale with a Volumetric Measurement
a Department of Radiology, Leiden University Medical Center, the Netherlands
b Departments of Gerontology and Geriatrics, Leiden University Medical Center, the Netherlands
c Division of Image Processing, Leiden University Medical Center, the Netherlands
d Division of Neurology, Leiden University Medical Center, the Netherlands
e Division of Epidemiology, Demography Biostatistics, the National Institute on Aging, the National Institutes of Health, Bethesda, Md
Address correspondence to D.M.J. van den Heuvel, MSc, Department of Radiology C2-S, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, the Netherlands
BACKGROUND AND PURPOSE: Detection of longitudinal changes in white matter hyperintensities (WMH) by using visual rating scales is problematic. We compared a widely used visual rating scale with a volumetric method to study longitudinal white matter changes.
METHODS: WMH were assessed with the visual Scheltens scale and a volumetric method in 100 elderly subjects aged 70–81 years for whom repetitive MR images were available with an interval of 33 (SD, 1.4) months. Reliability was determined by intraclass correlation coefficients. To examine the sensitivity of both the visual and volumetric method, we calculated Spearman rank correlations of WMH ratings and volume measurements with age.
RESULTS: Reliability of the visual rating scale was good, whereas reliability of the volumetric measurement was excellent. For baseline measurements of WMH, we found weaker associations between WMH and age when assessed with the visual scale (r = 0.20, P =.045) than with the volumetric method (r = 0.31, P =.002). Longitudinal evaluation of WMH assessments showed regression in 26% of the subjects when analyzed with the visual rating scale against 12% of the subjects when using volumetric measurements. Compared with the visual rating, the correlation between progression in WMH and age was twice as high when using the volumetric measurement (r = 0.19, P =.062 and r = 0.39, P < .001, respectively).
CONCLUSION: Volumetric measurements of WMH offer a more reliable, sensitive, and objective alternative to visual rating scales in studying longitudinal white matter changes.
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