Radiological examinations

Abstract

Images of human body can be produced by X-ray onto a screen or a film due to the properties of X-ray, such as its penetration, fluorescent effect and photographic effect, as well as the variances of human tissue in terms of density and thickness. Due to the existence of such variances, X-rays can be absorbed by human tissue in different degrees when it penetrate different human body tissues. Therefore, the dosage of X-ray onto the screen or film is discrepant to show contrasted image on the screen or film.