Work with the 3D windowThe program can create a 3D model from the 2D image data of the files of a DICOM series.
The user can use the menu command FileSendThe Active Series To 3D Window to create a 3D model of the current series.
The program offers 3 different 3D rendering techniques: The Isosurface technique, the Maximum Intensity Projection (MIP) technique, and the Transfer Function technique.
The program can display the 3d model of one, two or all the three techniques simultaneously on the screen.
The Isosurface techniqueThe program uses the marching cubes algorithm to construct the isosurface model, and allows the user to select the isovalue to create a model from different parts of the human body.
A model with a middle isovalue:
The same model with a low isovalue:
In the upper-left corner of the isosurface window there is a slider control that allows the user to select the isovalue.
The user can enable this technique with the menu command Show Isosurface Model (3D Model menu).
The Maximum Intensity Projection (MIP) techniqueIn this technique the program projects in the visualization plane the voxels with maximum intensity that fall in the way of parallel rays traced from the viewpoint to the plane of projection.
A model with the Maximum Intensity Projection (MIP) technique:
The user can enable this technique with the menu command Show MIP Model (3D Model menu).
The Transfer Function techniqueThe Transfer Function technique is a volume ray casting and rendering technique that assigns a different color and a different opacity/transparency value in different ranges of intensity values. This is done with a histogram based function, the "transfer function". The transfer function consists several control points, and each one of them corresponds to an intensity value and it has an RGB color and an opacity/transparency value. The intensity value of a control point is displayed with its color and opacity/transparency value, and the intensity values between two control points are displayed with the interpolated colors and the interpolated opacity/transparency values of the two control points. With the use of the transfer function, the different parts of the human body are displayed with a different color and a different opacity/transparency value.
The user can enable this technique with the menu command Show Transfer Function Model (3D Model menu).
The Transfer Function PaneThe user can design the transfer function with use of the Transfer Function Pane that allows the user to insert a control point in a specific intensity value, and to define the color and the opacity/transparency value of the control point. The Transfer Function Pane is accessible via the menu command "ViewPanes and Satus BarTransfer Function Pane".
In the background of the Transfer Function Pane there is the histogram of the image.
The transfer function creates a palette of colors that is assigned to the intensity values and it is displayed in the bottom of the graph.
Insert a control point:
Hold down the Ctrl key of the keyboard and press the left mouse button on the desired point of the histogram.
Change the position of a control point (intensity value):
Press the left mouse button on the desired control point and move it left (in a lower intensity value) or right (in a higher intensity value).
Change the position of a control point (opacity value):
Press the left mouse button on the desired control point and move it down (for a lower opacity value) or up (in a higher opacity value).
Change the color of a control point:
Press the right mouse button on a control point and select the menu item "Change Color".
Delete a control point:
Press the right mouse button on a control point and select the menu item "Delete".
Move a portion of the function:
Hold down the Shift key of the keyboard, press the left mouse button on the desired control point and move it left and right.
The changes are immediately displayed on the 3D model.
Transfer Function Pane controlsThe program offers several predefined transfer functions as well as user functions that are accessible via the combo box "Transfer Function".
Use this button to make a copy of the current transfer function. The user can make as many transfer functions as he/she wants.
Use this button to save the current transfer function. The user cannot save the predefined transfer functions, but he/she can make a copy of a predefined transfer function, modify it and save it with a different name.
Use this button to delete the current transfer function. The user cannot delete the predefined transfer functions.
Use this button to invert the colors of the current transfer function.
Hold down the Ctrl key of the keyboard and press this button to invert the entire transfer function.
"Transfer Function" combo box
Allows the user to select one of the predefined or user-defined transfer functions.
"Transparency Strength" slider control
Adjusts the transparency of the model. The "Transparency Strength" is a part of the current transfer function and saved with it.
"Diffusion Factor" slider control
Adjust the relation between the diffusion and ambient ligths. The "Diffusion Factor" is a part of the current transfer function and saved with it.
A low diffusion value creates a smooth model and a high diffusion value creates a sharp model.
The user can use the menu command 3D ModelBrightness to change the brightness of the model
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