Volume Rendering / Raycasting Images

by Thomas Lidy

Volume Rendering images

Rotation: Z 45
Skin Opacity: 0.03

Front View
Skin Opacity: 0.1

Rotation: X 0 Y -12 Z 90
Skin Opacity: 0.05

Rotation: X 0 Y -10 Z 90
Skin Opacity: 0.05
with highlight option on

Rotation: X 0 Y -10 Z 90
Skin Opacity: 0.02
Bone Opacity: 0.10
with highlight option on

Rotation: X 0 Y -10 Z 90
Skin Opacity: 0.50
with highlight option on

Test images

These images were made during development. Some images may show views, which are cannot be achieved with the current app. version; some images contain errors.

Rotation: Z
opacity transfer function acc. to gradients

Rotation: Z
Skin Opacity: 0.03
opacities not considering gradients

Rotation: X + Z
Skin Opacity: 0.03
opacities not considering gradients

Rotation: X + Z
Skin Opacity: 0.03
opacities not considering gradients
trilinear Interpolation

Shading

Shading with Skin threshold (~ 420)

Shading with Skin threshold (~ 420)
Rotation: Z 45
Highlight option on

The following images were made with a threshold for bones (~ 1650):

Front view
Highlight option on

Rotation: Z 45
no highlight

Rotation: Z 45
Highlight option on (highlight exponent: 16)

Rotation: Z 45
Highlight option on (highlight exponent: 128)

Rotation: X -18 Y -30 Z 100

Test image: light vector was kept in front of the head

Test image: shading of a large image (with nearest neighbour interpolation)
(black lines were due to an data array range problem)

X-Ray images

X-ray image from right
(Rotation: Z 90)

 
   

Slices

Slice along the X-axis
(left to right)

Slice along the Y-axis
(front to back)

Slice along the Z-axis
(top to bottom)

Slice along the Z-axis
with range colors on


(c) 2001 by Thomas Lidy
Vienna University of Technology