Computed Radiography (CR):
CR uses an imaging plate (IP) to create the image, which contains critical and precise details far greater than film. The digital image can then be viewed and enhanced using software that has functions very similar to other conventional digital image-processing software, such as contrast, brightness, filtration and zoom CR is capable of measuring thickness and lengths of parts and defects accurately electronically.
Digital Radiography (DR):
DR – the application of radiography where the radiographic film is replaced by a sensor that provides an immediate digital image of the radiograph. However, DR is also sometimes used as a more generic term which relates to the use of digital technology in radiography inspection. In such instances, it can refer to both the use of digital sensors and the scanning, ie digitization, of radiographic film.
Real Time Radiography (RTR):
The RTR process begins by emitting radiation at the object to be tested. The rays then pass through the object. On the other side of the object, there is either a phosphor screen or a flat panel with microelectronic sensors. The rays hit that screen which then gives off light. It’s this light which creates a digital image of the part in real time, including the internals of the part.
Places that are externally corroded or have other external defects can be identified by evaluating the color contrast of the representation. Areas that let more radiation get through cause the sensors to emit more light, which reflects on the image. Real-time radiography has become an excellent NDT method for detecting corrosion under insulation (CUI) and high temperature Sulfidation corrosion (HTSC).