-2-
¥Volume rendering
concepts:
²Goal is to create a 2D image consisting of pixels
²Each 2D pixel is obtained from data looking down line of
sight into 3D volume:
²Each 3D voxel
contains one numerical value
²Voxel value
determines the brightness (or color) of that voxel --- if it is visible
²Voxel value
determines the opacity of that voxel:
åOpacity = 0 Þ Transparent
(brightness does not contribute to image)
åOpacity = 1 Þ Opaque (nothing
behind it along the line will be seen)
åIntermediate values are translucent:
Opacity
= 0.5 Þ 50% of voxel brightness is added to pixel; voxels
farther down the line will contribute to
other 50% of pixel result
If
we looked directly from the subjectÕs right to left, all the data along the white line would contribute to one image
pixel
