What is digital radiography PDF?
Digital radiography (DR) is a term used to describe general radiography when the radiographic images are in digital form and are capable of being displayed on a computer monitor.
What are the 2 types of digital radiography?
There are two types of digital imaging systems used in intraoral radiography – computed radiography (CR) and direct radiography (DR). CR uses a photostimulable phosphor (PSP) plate to capture the image.
What are the three types of digital radiography?
There are three types of digital radiography: direct, semi-direct, and indirect.
What is the principle of digital radiography?
This technique uses x-ray sensitive plates to capture data during object examination, which is immediately transferred to a computer without the use of an intermediate cassette. The incident x-ray radiation is converted into an equivalent electric charge and then to a digital image through a detector sensor.
What are the advantages of digital radiography?
Digital Radiography Advantages: Reducing Cost and Space Reduced radiation. Reduced cost due to the elimination of chemical processors, processor maintenance, and filing and mailing jackets. Reduced space requirement — no dark room is required, and the need to dedicate space for cabinets of analog images is eliminated.
What is fill factor in digital radiography?
Fill factor is the percentage of the pixel in a digital radiographic image receptor that is sensitive to the incoming x-ray beam and allows conversion of the incident x-ray beam into light.
What is CR and CT?
Both DR and CR modalities produce a 2D image of the object. In contrast, CT systems produce a 3D image that is created by taking multiple image ‘slices’ (usually many thousands) at different angles around a single axis of object rotation.
What is a CR system?
Computed radiography (CR) systems in digital mammography are similar to those used in conventional radiography. These detectors employ a plastic sheet coated with a photostimulable phosphor material as the x-ray absorber.
Who invented digital radiography?
The dawn of the digital era in dental radiography came in 1987 with the first digital radiography system called radio visio graphy (RVG), launched by Dr. Francis Mouyen.
What equipment is necessary for digital radiography?
Digital imaging requires an x-ray unit, sensors to capture the images, computer hardware and software to view, store, and transfer images, and if an indirect digital system, a scanning device. A standard intraoral dental x-ray machine (Figure 2) may be used with radiographic film and digital imaging.
What are the disadvantages of digital radiography?
The main disadvantages of direct digital radiography are the thickness and rigidity of the digital detector, infection control, hardware and software maintenance, and the higher initial cost of the system.
What is Field factor?
For some simple geometrical shapes, however, such as spheres or ellipsoids, the field inside the particle is uniform and proportional to the field outside. The ratio of these fields is described by the local field factor f, which is defined as f = Ein/E.