General

1. Volume Information

It shows the basic properties of the current volume. These are different parameters of the property.

- size[voxel] : It expresses a volume as the number of grid type cells

- size[unit] : It expresses the physical size of the volume

- spacing: It expresses size of a cell respective to the x, y and z directions

- scalar range:        It expresses the maximum and minimum values of the scalar volume.

The above datum always displays when a volume opens.

2. Level of Detail Control

Users control the level of detail when they interact with the volume. They manage the interaction processes apt to computational capability of the workstation. The settings Low, Mid and High are available for controlling the display resolution of the volume to complete the level of detail rendering. The Ray casting option can be used for high resolution rendering after the initial interaction (i.e. when it was a still image). The selected option doesn¡¯t apply instantaneously to the rendering. (see Interaction Level below)

Each LOD could be enabled or disabled.

(Note) ¡°At least, One LOD must be in use¡± : More than one LOD is needed for rendering. If all four LODs are not in use, the warning message will pop up and a user inputs is aborted.

3. Interaction Level

When a user controls the Interaction Level, the proper LOD is automatically selected among the checked LODs on the left.

Three radio buttons can be selected exclusively.

There are three options: Quick/Coarse, Middle rate and Slow/Fine (speed/rendering quality). These two parameters are in inverse proportion to each other.

4. Ray Blending Function

This is an option to define a method to create value when a rendering is processed with Ray casting.

Two radio buttons can be selected exclusively.

Use Composite Blending Function: Each scalar value of the inner volume is acquired in a ray casting. These values are composed and reflected on the entire rendering.

Use Maximum Intensity Function: The maximum value of scalar acquired in a ray casting is used for the rendering.

5. Annotations

This is a subsidiary display function to see the exact volume properties.

Each option can be available either as an on or off mode, notated by a ¡°checked box¡±.

- Model Information: It shows the file information inside DICOM in a view window.

- Bounding Box: It displays the bounding box of the current volume.

- VOI BOX : When a user defines Cubic VOI, Bounding Box of the VOI on the part would be individually seen. This part is also displayed as slice view.

- World Coordinate System:  It displays the fixed coordinate on the imported model.

- 3D Cursor: It shows the position of the interested slice by cross planes of the 3D cursor. When a user changes the slice with the controller of slice view, the cursor is also modified.

- 3D tick Axes: A cursor to show the scale of seen section in zoom-in or zoom-out of a view of the volume. It is displayed regardless of the scale of current view.

6. Subsampling

It decreases the resolution of the current volume data equally in the X, Y and Z directions.

It selects the wanted sampling range in combo box. Each sampling range is available to convert with each other.

Subsampling is available to one, two times and the quadruple in regards to the origin data. The number 1 means no loss and the 2 and 4 refer to a 1/2 and 1/4 subsampling, respectively.

(Note) Unless interaction works smoothly with Level of Detail Control or Interaction Level, a user can use subsampling only in the middle of work process. This function affects the accuracy in the final polygon generation because it is not a visual filter, but rather, it directly modifies the volume data.