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Spatial Resolution vs Contrast Resolution
Spatial resolution shows fine detail; contrast resolution separates similar tissues. Each has its own test.
Two kinds
Spatial resolution is the ability to show small objects and sharp edges as separate, distinct details. Contrast resolution is the ability to tell apart structures with only a small difference in attenuation, such as two soft tissues of similar density. A system can be strong in one and weak in the other, so the registry treats them as different qualities.