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X-ray Vision: Diagnostic X-rays and CT Scans
Published in Suzanne Amador Kane, Boris A. Gelman, Introduction to Physics in Modern Medicine, 2020
Suzanne Amador Kane, Boris A. Gelman
Radiography that produces digital images that can be processed, stored and displayed on computers is called digital radiography. Several technologies are used in digital radiography. One is computed radiography (CR), not to be confused with computed tomography discussed in Section 5.11. In CR a latent image is created on plates coated with so-called storage phosphors, materials such as europium-doped barium fluoride, which exhibit photo-stimulated luminescence. Absorbed x-ray photons excite electrons that are trapped in impurities within the storage phosphor. The distribution of these trapped electrons represents the stored latent image. To convert the latent image into a digital image a scanning laser is used to illuminate the storage phosphor plate. The laser beam causes the trapped electron to escape and emit visible photons, which are guided into a photomultiplier tube.
Exposure Indicators
Published in Christopher M. Hayre, William A. S. Cox, General Radiography, 2020
In digital radiography (DR) a detector receives the X-ray photons and produces an image without the image storage and reading step (Torigian and Ramchandani, 2017: 4). The mechanism of taking the X-ray changes slightly for the radiographer because the use of a cassette is no longer required. Therefore, the radiographer does not need to take the cassette to be processed in a darkroom or by a CR reader. The image is displayed immediately on a monitor for viewing, manipulating, distributing, and recording (Carlton and Adler, 2013: 353).
9 Condition-Based Maintenance Techniques
Published in Jesús R. Sifonte, James V. Reyes-Picknell, Reliability Centered Maintenance-Reengineered, 2017
Jesús R. Sifonte, James V. Reyes-Picknell
Digital radiography is a form of x-ray imaging, where digital x-ray sensors are used instead of traditional film. This process can be carried out faster than conventional x-ray and uses less radiation to produce an image. Instead of x-ray film, digital radiography uses a digital image capture device.
X-ray-acquired imaging and detection radiography system using digital radiography with a DSLR digital camera: preliminary results of a pilot study
Published in Radiation Effects and Defects in Solids, 2023
Jae Yul Lee, Kyum Cha Lee, Dae Cheol Kweon
Digital X-ray image acquisition uses computed radiography (CR) and digital radiography (DR). A study on the function of low-dose imaging in reducing radiation exposure has been reported (2). However, access to DR is particularly challenging in developing countries due to a lack of adequate roads, inconsistent or non-existent power supply, poor internet access, and a shortage of trained physicians (3). The lack of adequate roads, inconsistent or non-existent power grids, little internet access, and a lack of trained doctors pose particular challenges. In addition, although X-ray facilities exist in remote local hospitals and many medical outposts, they are all film-based with few resident radiologists, and remote radiology is rare (3,4). Therefore, to spread it widely to other rural areas in developing countries, we developed an optimal DR system using a digital single-lens reflex (DSLR) digital camera to provide medical services and information through telehealth (5).