What is the photostimulable phosphor used in CR imaging? Digital radiography CR uses a storage phosphor that requires light input to release the trapped energy in the form of light that is proportional to the
What is the photostimulable phosphor used in CR imaging?
Digital radiography CR uses a storage phosphor that requires light input to release the trapped energy in the form of light that is proportional to the X-ray intensity. It is referred to as a photostimulable phosphor.
What is the process of photostimulable luminescence?
Photostimulated luminescence (PSL) is the release of stored energy within a phosphor by stimulation with visible light, to produce a luminescent signal. X-rays may induce such an energy storage.
What is photostimulable storage phosphor imaging plate?
Photostimulable x-ray storage phosphors in form of image plates are a promising alternative to conventional two-dimensional x-ray detectors. By absorption of ionizing radiation, electrons and holes are generated and captured locally to form a dose proportional latent image.
What is activator in computed radiography?
The computed radiography imaging plate should be handled with the same care given to a screen-film cassette. What is the purpose of europium in a photostimulable phosphor? The europium is called an activator. It is responsible for electrons being trapped in metastable states.
What is the disadvantage of computed radiography?
Disadvantages of CR CR requires the cassette be removed from the X-ray machine and then placed into a reader. This is a labor-intensive step that requires the technician to leave the patient and work station with each imaging procedure, even if for a short time.
What is the difference between conventional radiography and computed 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.
What is the difference between computed radiography and digital radiography?
Digital Radiography (DR) is the latest advancement in Radiography. DR technology quickly transfers images to the computer so you can view and diagnose without wait time. Computed Radiology (CR) is the digital replacement of X-ray film radiography. CR radiography uses phosphor image plates to create a digital image.
How many times can storage phosphor be used?
The findings of this study revealed that even though a slight deterioration occurred after the first exposure, each plate can be used up to 200 times.
What happens to a storage phosphor plate after it is scanned?
A filter in front of the PMT absorbs the reflected laser light and transmits the phosphor emission light (Figure 4). In the PMT, the light signal is transformed into an electrical signal, amplified, digitized and stored in a computer file. After erasure the plate is re-inserted into the cassette for re-use.
How does computed radiography harness the absorption of radiation?
Computed radiography harnesses the absorption of radiation, trapping electrons at energy levels via the process of photostimulable luminescence. The computed radiography plate has a thin layer of phosphor grains, known as a photostimulable phosphor.
What do you need to know about computed radiography?
Computed radiography (CR) is the use of photostimulable phosphor as an image receptor. The image receptor is held in a similar casing (cassette) to that of the traditional film screen. Computed radiography harnesses the absorption of radiation, trapping electrons at energy levels via the process of photostimulable luminescence.
How are image receptors held in computed radiography?
The image receptor is held in a similar casing (cassette) to that of the traditional film screen. Computed radiography harnesses the absorption of radiation, trapping electrons at energy levels via the process of photostimulable luminescence. The computed radiography plate has a thin layer of phosphor grains, known as a photostimulable phosphor.
How is a computed radiography plate exposed to a laser?
The computed radiography plate is exposed to a small, high-intensity laser resulting in the previously trapped electrons to return to their respective valence bands, letting off violet light.