Voxel

Voxel is an abbreviation for "Volumetric Pixel." In computed tomography (CT), the three-dimensional object is divided into the smallest volume elements to digitally capture and represent it. These volume elements are called voxels and represent the smallest unit in the digital representation of the object being scanned.

Each voxel in CT has a specific size determined by the geometry and settings of the CT device. The size of the voxel has a direct impact on the quality of the CT images. If the voxels are too large, fine details are lost, while too small voxels can lead to unnecessary increases in data size.

A CT scanner creates images by sending X-rays through the body and recording the intensity of the rays absorbed by body tissue. The intensity of the rays is measured in each voxel of the scan and converted into a digital number called a CT value. The CT values represent the density of the tissue in each voxel, with air being the lowest density and bone being the highest.

The CT data is usually displayed as two-dimensional images composed of the many voxel rows of the scan. These images show detailed structures of the body being scanned and can be used for diagnosing diseases and injuries.

In summary, a voxel in CT is a three-dimensional unit that represents the smallest volume element captured and digitally represented as a CT value. The use of voxel technology enables CT scans to produce high-resolution images of the body and allow for accurate diagnosis of diseases and injuries.