Question

The smallest unit in the reconstruction/projection of an MRI image is called as

• A. ( \text{Pixel} ) \
• B. ( \text{Voxel} ) \
• C. ( \text{Binary unit} ) \
• D. ( \text{Dot} ) \

Hint:

Distinguish between "pixel" and "voxel" based on dimensionality. Pixels are 2D units, while voxels are 3D units. Since MRI and CT generate volumetric data, "voxel" is the appropriate term for their smallest reconstructed unit.

Answer 1

The Correct Option is B

In two-dimensional imaging, like a photograph or a traditional X-ray, the smallest discrete unit of information is a pixel (picture element).
A pixel represents a 2D area.However, MRI (Magnetic Resonance Imaging) and CT (Computed Tomography) scans produce three-dimensional data sets, even though they are often displayed as 2D slices.
The smallest discrete unit of information in a 3D image or volume is a voxel (volume element).
A voxel represents a 3D volume, having dimensions of length, width, and depth (slice thickness).
Each voxel contains information about the tissue properties at that specific 3D location, such as signal intensity in MRI or Hounsfield units in CT.
Binary unit and dot are not standard terms for image units in medical imaging.