![]() Sixth, the image plate is then exposed to a high-intensity halogen lamp, which erases any residual energy remaining from a prior exposure. Fifth, the electronic signal is digitized and stored in a display monitor and later sent to a PACS. Fourth, the light released from the imaging plate is collected by the fiber-optic light guide and strikes a PMT, where it produces an electronic signal. This helps in identification of the light photons of higher energy and shorter wavelength by the photomultiplier tube (PMT), because the image signal is separate from the laser light, which is of a longer wavelength and lesser energy than the signal from the CR digitizer (or reader). The two lights (laser light and the released light photon) have different wavelengths, which forms the basis for image retrieval. Third, the laser light stimulates the trapped electrons to become free and return to a lower energy state, which results in the release of light photons. Second, the imaging plate is moved by the rollers for scanning by the laser beam. 2 ), First the cassette is opened in the CR reader with release of the imaging plate from the cassette. The following steps are used to process the image ( Fig. ![]() In this article, we discuss and illustrate the various CR artifacts encountered in our clinical practice, along with their remedial measures. However, even with technologic improvements in CR systems, we continue to encounter artifacts that degrade image quality, leading to misdiagnoses that may have medicolegal implications. Hence, it is imperative to improve the quality of radiographs by constant advancements in technology. In today's era of CT and MRI, radiography still remains the primary imaging technique. After performing cost analysis and capacity utilization of general radiography, CR still scores over digital radiography. Even though digital radiography is gaining in popularity, CR will continue to play a significant role in an emergency setup. Unlike digital radiography systems, a multiple cassette size option is available in CR systems. Also, the CR system has the advantage of positioning flexibility for difficult views, because CR cassettes can be placed in any position, which is not possible in digital radiography systems. The image quality of CR on large body parts, such as the chest and abdomen, is better than that of digital radiography, whereas digital radiography is preferred for small body parts and extremities. The wide latitude of CR improves the consistency of good-quality bedside radiographs. Unlike the competing digital technology, CR is particularly suitable for bedside radiographic examinations, which usually are the worst images in general radiography because of the emergency conditions under which the examinations are performed. In our hospital, as in most major hospitals in India, the CR system is used for most of the hospital's general radiography work flow. The transition to digital imaging is completed by installing CR readers and replacing film-based cassettes with image plate–based CR cassettes. Such systems are widely accepted in radiology departments because they are cost-effective solutions to the shift from conventional film-based imaging to digital imaging, whereby the existing radiography equipment can be retained and used. Computed radiography (CR) systems based on photostimulable phosphor (PSP) image detectors (i.e., imaging plates) were first introduced commercially in 1983.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |