Dr Mohamed Amr Mohamed2026-08-052026-08-05https://dspace.academy.edu.ly/handle/123456789/2492Images of the human body are derived from the interaction of energy with human tissue. The energy can be in the form of radiation, magnetic or electric fields, or acoustic energy. The energy usually interacts at the molecular or atomic levels [1]. On Friday evening, 8 November 1895 Röntgen, Wilhelm Conrad (also sometimes spelled Roentgen) discovered a “new kind of ray” that penetrated matter. Röntgen professor of physics at Julius Maximilian University of Wurzburg, named the new kind of ray X-strahlen “X-rays” (“X” for unknown). [2] X-rays are electromagnetic waves having energy in the general range of approximately one to several hundred kilo electron volts (keV). In medical X-ray imaging, the X-ray energy typically lies between 5 and 150 keV, with the energy adjusted to the anatomic thickness and the type of study being performed [3]. X-ray technology are divided into two main groups digital and conventional film-screen system, digital radiography is a form of X-ray imaging, where digital X-ray sensors are used instead of traditional photographic film. X-rays are known to cause malignancies, skin damage and other side effects and they are thus potentially dangerous. Therefore, it is essential and in fact mandatory to reduce the radiation dose in diagnostic radiology as far as possible. TThe aim of this study was to evaluate the image quality and Patient radiation dose in chest imaging using a Charge-Coupled Device (CCD) detector system with the image quality and doses delivered by a state-of-the-art conventional film-screen radiography system. The X-ray system used in this study was special system used only in Posteroanterior chest radiographs, it is a photofluorographic system “ conventional screen-film system “ and the same system upgraded to digital with CCD technology. Image quality was evaluated to ensure that the potential reduction in radiation dose did not result in decreased image quality. Two groups of fifty patients referred to the radiology department for routine posteroanterior chest radiography in National Center of Diseases Control (Tripoli-Libya). At random, images obtained with the film/screen system and CCD detector system. All patient groups were matched for body mass index. To measure effective dose which represents the risk of late radiation-induced effects, we used Fluke Victoreen 4000 M to measure Air Kerma then use PC-based Monte Carlo program for calculating patient’s effective dose. Image quality of two systems was evaluated by three experienced radiologists. The CCD detector radiography system allowed a reduction in effective dose compared with the film-screen radiography. In addition, image quality produced by CCD camera detector radiography system was significantly better than the image quality produced by the film-screen radiography systemsImage quality and Patient Radiation Dose in Chest X