In CT imaging, spatial resolution is BEST described as the ability to:

• A Distinguish between tissues with very similar attenuation values
• B Detect small differences in contrast between two tissues
• C Reduce image noise while maintaining image quality
• D Distinguish two closely spaced high-contrast objects as separate ✓

Explanation

Spatial resolution is the ability to discriminate two small, high-contrast objects as separate and distinct. It is measured in line pairs per centimeter (lp/cm). Distinguishing tissues with similar attenuation is contrast resolution, a separate parameter. Noise reduction relates to dose and reconstruction algorithms, not spatial resolution per se. High spatial resolution requires small detector elements and sharp reconstruction kernels.

Reference: Bushberg, The Essential Physics of Medical Imaging, 3rd ed.

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Written and medically reviewed by the StethoPrep medical team.