Abstract
AbstractScattered X-rays are produced when diagnostic X-ray images of patients are taken. It is generally believed that scattered X-rays should be eliminated as much as possible because they degrade the image quality, namely the sharpness and the radiographic contrast. However, excessive elimination of the scattered X-rays decreases photographic density. This results in a greater patient dose to achieve proper density. It is therefore desirable to determine the ideal content of scattered X-rays, object by object, balancing the tivo objectives of high image quality and low patient dose.In this study, the effects of the scattered X-rays upon the image quality were investigated by measuring the radiographic contrast of aluminium square-wave chart images, with various scatter fractions. Relative patient doses were determined using mAs values. As a result, a contrast-dose diagram is proposed. This diagram is very useful to determine exposure conditions, balancing high image quality and low patient dose in clin...
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