line spread function

Also found in: Acronyms.

line spread func·tion (LSF),

a measure of the ability of a system to form sharp images; in radiology, determined by measuring the spatial density distribution on film of the x-ray image of a narrow slit in a dense metal, such as uranium; from this can be calculated the modulation transfer function.

line spread function (LSF)

a graph obtained from the image of a narrow line, which quantifies the amount of blur produced by an imaging system.