Radiographic Seminar Exam 2 Practice

Spatial resolution is set by how finely the detector samples the image. A detector element size of 100 microns equals a pixel pitch of 0.1 mm. The maximum line-pair frequency you can sample without aliasing is half the sampling rate (the Nyquist limit). So the highest resolvable line pairs per millimeter is 1 / (2 × 0.1 mm) = 5 lp/mm. Thus a 100 μm detector element theoretically yields about 5 line pairs per millimeter. In practice, factors like blur, motion, and system optics can reduce this, but the Nyquist limit given by the 100 μm pitch is 5 lp/mm.