Film Behaviour to Exposure

Abstract

When using film material it is essential to know how it will react under the imaging conditions chosen. For example, when a film is exposed to the X-ray beam transmitted by the patient and then processed, will it be possible visually to retrieve from the image all the information that was contained in the beam? Is it possible by altering the voltage and the mA to increase the amount of information in the image and is it then possible to see this information? What effect will the use of intensifying screens have on the retrieval of information? How can the ‘best’ image be obtained? These are just some of the important questions that require an answer and unfortunately a few cannot be satisfactorily answered. As an attempt to answer some of these questions the characteristic curve must first be introduced.