What does the voxel represent in CT imaging?

In computed tomography (CT) imaging, a voxel represents a volume element within the scanned body. This term is derived from "volumetric pixel," emphasizing that it is not just a two-dimensional representation but rather a three-dimensional entity that holds information about a specific portion of the body's tissue within the imaged volume.

When a CT scan is performed, the imaging system captures data slice by slice, and each slice is divided into a grid of voxels. Each voxel corresponds to a small cubic volume of tissue, allowing for complex visualization of the anatomy. The data obtained from these voxels are critical in forming the final images, as they are used to determine the density and composition of the tissues within the scanned area. This volume element carries essential information crucial for diagnosing various conditions, distinguishing between different types of tissues, and assessing structures within the body.

Understanding the role of voxels is fundamental in interpreting CT images, as it provides insight into the spatial arrangement and density of tissues, which aids in clinical assessments and decision-making.