Beating Heart

IDL Demo Library

Beating Heart

The heart geometry is generated from triangulating an array of points into a series of quad polygons. Each step in the sequence of the beating heart consists of 3 parts: Inner Surface, Outer Surface, and Bottom (connecting) surface.

The colors are determined using a color lookup value from a 3D array of perfusion values stored for every point. The object geometry representing the heart is manipulated based on the data for each of the above steps to show the shape of the heart through one heartbeat cycle.

Data Courtesy of:

Dr. Stephan Nekolla

Leiter Medizinische Datenverarbeitung

Klinik und Poliklinik fuer Nuklearmedizin

Klinikum rechts der Isar der Technischen

Universitaet Muenchen

Ismaningerstr. 22 D-81675 Muenchen

IDL Features

This demo uses the following features from IDL Object Graphics:

Interactive 3D graphics to control the object transformation (rotation) with the mouse.

Geometry creation using "IDLgrPolygon" and "IDLgrPolyline" to represent the heart light source icons.

Light source shading, using 2 "Positional" light sources.

Menu Options

File Menu

Select "Quit" to exit the Beating Heart Demo and return to the IDL Demo main screen.

Options Menu

Shading

Select either Flat or Gouraud shading for the solid. Gouraud shading results in a more realistic appearance. Shading is only enabled when the Style is set to Solid.

Style

Select either Wire or Solid to represent the surface of the heart.

Drag Quality

Select either Low or High quality for when you rotate the solid by dragging the mouse. Low quality shows a wire surface when dragging while High quality retains the surface displayed.

Help Menu

Select "About Beating Heart" for information about the Beating Heart Demo.

Features

Geometry Visibility checklist

Select one or all of the following choices for displaying the heart. A check next to the item specifies that it is enabled.

Outer surface

Inner surface

Bottom surface

3D Axis

Light icons

Annotations

Note
The axes are color-coded. The red line represents the X axis, green represents Y, and blue represents Z.

Start button

Starts the sequence of steps showing the heart through one heartbeat cycle.

Step button

Displays each step in order.

Reset Orientation button

Reset the heart to its initial orientation.

Interactive Movement

Use your left mouse button to interactively rotate the heart. Position the cursor on the image and, while holding down the left mouse button, move the cursor to rotate the heart. Release the mouse button when you are satisfied with the position of the heart.

IDL Demo Online Help (October 11, 2006)