What is computed radiography system?
Computed radiography is an indirect form of digital imaging using a cassette system similar in appearance and function to that used in conventional film-screen radiography (Fig. 2-37). Within the cassette is a photostimulable storage phosphor (PSP) screen detector plate that stores a latent image upon x-ray exposure.
Is computed radiography still used?
Computed Radiology (CR) is the digital replacement of X-ray film radiography. CR radiography uses phosphor image plates to create a digital image. Although it is an older technology, it is still digital technology and is more cost effective. It does need more input and requires more time for image acquisition.
What is the difference between CR and DR system?
The difference between a Digital Radiography (DR System) and Computed Radiography (CR System) is simply that – DR system is truly a digital X-Ray while CR system is not an X-Ray machine at all.
What are the types of computed radiography system?
computed radiography.
Which is better CR or DR?
DR offers superior throughput compared to CR because it embeds the imaging processing cycle in the acquisition task: images can appear as quickly as five seconds. CR involves more steps because cassette processing takes longer.
Where is the PSP plate located?
Most storage phosphor plates are made of a barium fluorohalide. A PSP plate is placed inside a cassette, and when x-rays strike the PSP, some light is given off. Some of the photon energy is deposited within the phosphor particles, creating the latent image. The phosphor plate is then fed through the CR reader.
What is the difference between 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.
Is digital radiography better than computed radiography?
Deciding between computed and digital radiography Overall image quality is enhanced and more efficient with DR systems in comparison to CR systems; DDA exposures are typically 10-15 seconds in duration, which drastically reduces inspection times.
What are the advantages of computed radiography over conventional radiography?
Advantages of computed radiography compared with conventional film/screen combinations include improved contrast resolution and postprocessing capabilities. Computed radiography’s spatial resolution is inferior to conventional radiography; however, this limitation is considered clinically insignificant.
Is digital radiography same as computed radiography?
Both computed radiography (CR) and digital radiography (DR) require the use of digital technologies which rely on computer networks and high-bandwidth web facilities. DR uses flat panel detectors based on direct or indirect conversion of X-rays to charge, which is then processed to produce a digital image.
What are the four types of PSP artifacts?
The four groups included: (1) operator- and patient-induced, (2) ambient light-induced, (3) PSP plate-induced and (4) scanner-induced errors and artefacts.
What is a PSP plate made of?
In PSP systems, the radiographic image is recorded on a thin sheet of plastic known as the imaging plate. The imaging plate consists of several layers (Figure 4-4): • A protective layer. This is a very thin, tough, clear plastic that protects the phosphor layer.