Local Histograms for Design of Transfer Functions in Direct Volume Rendering

Authors:
Claes Lundstrom;Patric Ljung;Anders Ynnerman
Affiliations:
IEEE;IEEE Computer Society;IEEE Computer Society
Venue:
IEEE Transactions on Visualization and Computer Graphics
Year:
2006

Citing 15
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Abstract

Direct Volume Rendering (DVR) is of increasing diagnostic value in the analysis of data sets captured using the latest medical imaging modalities. The deployment of DVR in everyday clinical work, however, has so far been limited. One contributing factor is that current Transfer Function (TF) models can encode only a small fraction of the user's domain knowledge. In this paper, we use histograms of local neighborhoods to capture tissue characteristics. This allows domain knowledge on spatial relations in the data set to be integrated into the TF. As a first example, we introduce Partial Range Histograms in an automatic tissue detection scheme and present its effectiveness in a clinical evaluation. We then use local histogram analysis to perform a classification where the tissue-type certainty is treated as a second TF dimension. The result is an enhanced rendering where tissues with overlapping intensity ranges can be discerned without requiring the user to explicitly define a complex, multidimensional TF.