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Cutting Plane in Rotating Heart
(CT Scan)

This movie illustrates several features in VoxBlast. A stack of 144 images were captured of an excised hogheart using an Imatron CT scanner. The heart's arteries had been perfused with a radio-opaque dye.

The stack of images were loaded into VoxBlast. The correct interpixel and interslice distance was used to provide the proper aspect ratio in all 3 dimensions. VoxBlast uses the most precise fractional interpolations possible.

Next, a palette was applied to make the heart muscle red and the arteries yellow. The heart was rendered and the post-rendering lighting model (one of two lighting models available in VoxBlast) was applied to create surface texture. A cutting plane was placed near the middle of the heart and a different opacity function was applied to one side of the cutting plane. The second opacity function was set to remove the heart muscle, but leave the arteries visible. Finally, a movie loop was created to show the heart's arteries emerging from the heart muscle, then merging back into the heart muscle as the heart rotates. A blue background was appled to create contrast with the heart.

The data is courtesy of the late Dr. Mel Marcus, University of Iowa.

Click here to download a larger version of this movie loop.

Click here to download the Windows version of the VoxBlast movie player (75,000 bytes).