Which modality shows 6 lp/mm resolution?

Which modality shows 6 lp/mm resolution?

• A. Screen-Film Radiography
• B. MRI
• C. Computed radiography
• D. Ultrasonography

Answer: (C)

Line pairs per millimeter measure how many alternating black and white lines a system can distinguish in one millimeter; higher values mean finer detail. Screen-film radiography typically delivers greater spatial resolution than 6 lp/mm, depending on the film-screen combination. MRI and ultrasonography use different metrics for resolution—MRI is described by voxel size and image quality, while ultrasound depends on sound wavelength and beam focusing—not lp/mm. Computed radiography, which uses a digital detector with a photostimulable phosphor plate readout, commonly achieves around 5–6 lp/mm, aligning with a 6 lp/mm specification. Thus, computed radiography is the modality that shows about 6 lp/mm resolution.

Line pairs per millimeter measure how many alternating black and white lines a system can distinguish in one millimeter; higher values mean finer detail. Screen-film radiography typically delivers greater spatial resolution than 6 lp/mm, depending on the film-screen combination. MRI and ultrasonography use different metrics for resolution—MRI is described by voxel size and image quality, while ultrasound depends on sound wavelength and beam focusing—not lp/mm. Computed radiography, which uses a digital detector with a photostimulable phosphor plate readout, commonly achieves around 5–6 lp/mm, aligning with a 6 lp/mm specification. Thus, computed radiography is the modality that shows about 6 lp/mm resolution.