Actually, neither pixel size nor DPI tells much about spatial resolution, as the latter refers to the frequencies in an image that can be perceived and was measured in line pairs/mm in earlier days. Line pairs per mm might also be acceptable. In digital radiography, the MTF at either 50% or 10% modulation is the internationally accepted measure for spatial resolution since they produce the highest resolutions. It describes how well an imaging system performs in depiction of fine structures with minimal blur. MTF is calculated from the line-spread function (LSF), and is the method of characterizing the spatial response of an imaging system. Spatial resolution is best described by the modulation transfer function (MTF), since this clearly relates perceptible contrast to spatial frequency in an image. This is because images may need to be digitized, edited, and printed, all of which can produce some artifacts that should be avoided. This, however, can introduce some difficulties to these fields regarding the machine-human interfaces. Hence, practice and research in dentistry are relying progressively on the new format. Moreover, digital radiographs and photographs might provide better accuracy and reproducibility, as dentists can use features of image editor programs (such as digital zoom and color/brightness editing tools) to make the image reading more comfortable ,though with a similar or even better accuracy. Compared to conventional film-based radiographs, their digital alternatives need less X-ray exposure and preparation time, and are much more convenient to handle, store, copy, and share by dentists, radiologists, and patients. Digital imaging has been extremely beneficial to dental practice.
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