Spatial resolution is measured in which unit?

Spatial resolution is measured in which unit?

• A. Lp/mm (line pairs per millimeter)
• B. Grays
• C. Lumens
• D. MmHg (mercury)

Answer: (A)

Spatial resolution refers to how small and closely spaced details an imaging system can distinguish. The unit used to express this is line pairs per millimeter, which tells you how many alternating black-and-white line pairs can be resolved within a single millimeter. A higher lp/mm value means finer detail and sharper image. This metric is commonly determined with line-pair test patterns or phantoms and reflects how well the system can separate adjacent structures. The other units—Grays measure absorbed radiation dose, lumens measure light output, and millimeters of mercury measure pressure—do not describe image detail resolution.

Spatial resolution refers to how small and closely spaced details an imaging system can distinguish. The unit used to express this is line pairs per millimeter, which tells you how many alternating black-and-white line pairs can be resolved within a single millimeter. A higher lp/mm value means finer detail and sharper image. This metric is commonly determined with line-pair test patterns or phantoms and reflects how well the system can separate adjacent structures. The other units—Grays measure absorbed radiation dose, lumens measure light output, and millimeters of mercury measure pressure—do not describe image detail resolution.