In which axis does the longitudinal dimension of a voxel primarily lie?

The longitudinal dimension of a voxel primarily lies in the Z-axis, which is also commonly referred to as the axis representing depth or height in three-dimensional space. In most CT imaging contexts, the X and Y axes represent the plane dimensions—width and length—while the Z-axis is perpendicular to these two, allowing for the representation of the depth or thickness of the voxel.

In computed tomography, a voxel (volume element) is a three-dimensional pixel that represents a value in a three-dimensional space. When imaging, different sections of data are acquired, and as these slices stack along the Z-axis, they accumulate to form the entire volumetric representation of the scanned area. This understanding is important for grasping how image resolution and data acquisition in CT correlate with the structure of a voxel, as well as its implications in 3D reconstructions of the scanned anatomy.

The other axes in the context of imaging do not serve to define the longitudinal aspect of a voxel as effectively as the Z-axis does. The X-axis typically runs horizontally, whereas the Y-axis runs vertically in the imaging plane, neither of which conveys the concept of depth as the Z-axis does. Additionally, while the W-axis might imply a fourth dimension, it is generally not applicable in standard