When discussing image quality in MRI, what does voxel size influence?

• A. Contrast resolution
• B. Temporal resolution
• C. Signal intensity
• D. Spatial resolution

Answer: (D)

Voxel size is a crucial factor in MRI that directly influences spatial resolution. Spatial resolution refers to the ability to distinguish between two closely spaced objects in the image. The size of a voxel, which is a three-dimensional pixel representing a value in space, determines how finely an image can be detailed.

When voxel size decreases, more voxels can fit into a given area, allowing for more detail to be captured in the imaging process. This results in a clearer and more defined image, enhancing the ability to distinguish between small structures or closely spaced lesions. Therefore, a smaller voxel size is associated with higher spatial resolution.

In contrast, while factors such as contrast resolution, temporal resolution, and signal intensity might be influenced by other parameters in the imaging process, they do not have the same direct correlation with voxel size as spatial resolution does.