X Ray Image Formation. The formation of the x ray image within the body by differences in attenuation is controlled by the matching of the x ray beam spectrum to the characteristics of the tissues or contrast media and the body sections being imaged. The variations in absorption and transmission of the exiting x ray beam structurally represent the anatomic area of interest.
This spectrum can be manipulated by changing the x ray tube current or voltage settings or by adding filters to select out low energy x rays. A radiographic image is created by passing an x ray beam through the patient and interacting with an image receptor such as a film screen or digital system. As a result of characteristic and bremsstrahlung radiation generation a spectrum of x ray energy is produced within the x ray beam.
This spectrum can be manipulated by changing the x ray tube current or voltage settings or by adding filters to select out low energy x rays.
The process of image formation is a result of differential absorption of the x ray beam as it interacts with the anatomic tissue. Differential absorption is a process whereby some of the x ray beam is absorbed in the tissue and some passes through transmits the anatomic part. The variations in absorption and transmission of the exiting x ray beam structurally represent the anatomic area of interest. The formation of the x ray image within the body by differences in attenuation is controlled by the matching of the x ray beam spectrum to the characteristics of the tissues or contrast media and the body sections being imaged.