Dense mode clustering in brain maps

Stephen Hanson, Rebbechi Rebecchi, Catherine Hanson, Yaroslav O. Halchenko

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A mode-based clustering method is developed for identifying spatially dense clusters in brain maps. This type of clustering focuses on identifying clusters in brain maps independent of their shape or overall variance. This can be useful for both localization in terms of interpretation and for subsequent graphical analysis that might require more coherent or dense regions of interest as starting points. The method automatically does signal/noise sharpening through density mode seeking. We also discuss the problem of parameter selection with this method and propose a new method involving 2-parameter control surface, in which we show that the same cluster solution results from tradeoff of these 2 parameters (the local density k and the radius r of the spherical kernel). We benchmark the new dense mode clustering by using several artificially created data sets and brain imaging data sets from an event perception task by perturbing the data set with noise and measuring three kinds of deviation from the original cluster solution. We present benchmark results that demonstrate that the mode clustering method consistently outperforms the commonly used single-linkage clustering, k means method (centroid method) and Ward's method (variance method).

Original languageEnglish (US)
Pages (from-to)1249-1262
Number of pages14
JournalMagnetic Resonance Imaging
Volume25
Issue number9
DOIs
StatePublished - Nov 1 2007

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

Fingerprint Dive into the research topics of 'Dense mode clustering in brain maps'. Together they form a unique fingerprint.

Cite this