Chapter 2. Tooth Data

Table of Contents

Loading Data
Resampling and Cropping.
Visualizing Tooth Slices
Selecting Slices
Coloring Slices
Emphasizing Tooth Features
Visualizing the Tooth Volume
Using the Paintbrush
Transfer Functions
Emphasizing Tooth Materials
Emphasizing Tooth Material Borders

The tooth data used in this tutorial are industrial CT data of a human tooth. The data are stored in a format called Nearly-Raw Raster Data or NRRD. See the NRRD web site for information on this data format. See Chapter 5, Data Input for other data formats supported by BioImage.

Loading Data

To load data, start by clicking the Generic tab in the Processing Pane, then click the Browse button. See item 2 in Figure 2.1.

Now select tooth.nhdr and click Set. The file browser window will close. Click Update, located near the bottom of the Processing Pane (item 4 in Figure 2.1), to load the data into BioImage.

Figure 2.1. Processing Pane

Loading the Tooth dataset.

After loading data, BioImage will display the visualizations shown in Figure 2.2. The top pane displays a three dimensional representation of the data as orthogonal slices. The bottom three panes present the slices individually.

The slice panes show sagittal, coronal, and axial views respectively. Depending on the order of the axes in the volume, the data may need to be flipped or permuted so that axis labels are correct. The Viewing Cube, located in the Processing Pane (item 3 in Figure 2.1), allows the user to change the orientation of slices presented in the visualization panes. The orientation of each view can be changed by altering the abbreviation next to the proper arrow. By default, the axial, sagittal, and coronal slices are viewed from the superior, anterior, and left views respectively. To change this, click the appropriate arrow entry box, type a value, then click the Viewing Cube icon (button). This will update all visualization panes. Valid orientation options are:

S: Superior
I: Inferior
A: Anterior
P: Posterior
L: Left
R: Right

To reset the views to the default parameters, press Reset in the lower right corner of the Load Data window.