What is the effect on image quality if voxel size decreases?

• A. It remains unchanged
• B. Improves spatial resolution
• C. Reduces contrast
• D. Increases motion artifacts

Answer: (B)

When voxel size decreases, the overall spatial resolution of the image improves. This is because a smaller voxel can capture more detailed information about the structure being imaged. Voxel size refers to the three-dimensional equivalent of a pixel, and it directly affects how finely the image can represent structures within the imaging volume.

With smaller voxels, the imaging system can distinguish between finer details in the anatomy, which enhances the clarity and sharpness of the image. This increased resolution allows for better visualization of small structures and pathologies, leading to more accurate diagnoses.

The impact on image quality is significant, as improved spatial resolution helps in identifying small lesions or subtle changes in tissue that might be clinically relevant. Therefore, decreasing voxel size is a desirable aspect when higher image quality is needed in magnetic resonance imaging.