What is the opacity of voxels in a 3D model adjusted by?

The opacity of voxels in a 3D model is primarily adjusted by tissue characteristics. In CT imaging, different types of tissues have varying densities and atomic compositions, which affect their ability to attenuate X-rays. For example, denser tissues like bone will appear more opaque (or white) on images, while less dense tissues like fat or air will appear more translucent (or darker). This difference in attenuation results in variations in voxel opacity, allowing for the visualization of distinct anatomical structures within the body.

Understanding that tissue characteristics influence the voxel opacity highlights the importance of composition and density in imaging, which is crucial for accurate diagnosis and treatment planning. This relationship allows radiologists and technicians to interpret images based on the specific properties of the tissues being imaged.