IMAGE QUALITY OF RADIOGRAPHS : FROM A STANDPOINT OF EQUIPMENTS

Several factors are considered nowadays to dominate the image quality of radiographs. Blurs and noises are the most important among them in relation to radiographic equipments. Modern methods to evaluate these two factors are introduced, namely, modulation transfer functions for blurs and signal to noise ratios for noises. Some examples of actual blurs and noises present in radiographs are analised by these methods. Recent progresses and future developments of radiographic image quality are also discussed from the standpoint of radiographic equipments.