What are the CR imaging plates made of?
What are the CR imaging plates made of?
Computed radiography (CR) systems are very similar to film-based systems, but instead of film, a photostimulable phosphor plate is used. These flexible plates are 1 mm thick and are coated with europium activated fluorohalide compounds in crystalline formation embedded in organic binding material.
What is the purpose of a photostimulable phosphor plate?
Photostimulable phosphor (PSP) plates are still widely used as receptors in intraoral radiography. These image receptors allow indirect digital image acquisition; more specifically, after the exposure, latent image occurs on the plate, it is then converted to a digital radiographic four image via a scanning device.
How thick is the phosphor of the PSP?
Energy storage. On photostimulable phosphor (PSP) plates, the phosphor layer is typically 0.1 to 0.3 mm thick.
What is the difference between fast scan and slow scan?
In inkjets with moving carriages, the “fast scan” is the direction of the relative movement of the head and substrate. The “slow scan” direction is at 90 degrees to the fast one. These terms are useful when relating the printing motion to a particular image.
How does photostimulable phosphor work?
Photostimulable phosphors (PSP) are materials that store absorbed energy within excited electrons and release it in the form of light on exposure to laser energy. these secondary electrons excite surrounding electrons from their valence bands to their conduction bands through inelastic collisions.
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 the disadvantage of 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….Disadvantages for DR.
| CR | DR |
|---|---|
| Higher risk of overexposure | Lower risk of overexposure |
| Suitable for low or moderate workflow | Ideal for high workflow |
How long do phosphor plates last?
According to the manufacturers, the plates will lose their ability to capture a diagnostic image after 750 to 1,000 uses. In reality, few offices will see these results. The plates are easier to scratch and damage, and most offices will be lucky to get 500 uses out of each plate.
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.
What is a photostimulable phosphor system?
A photostimulable phosphor (PSP) is a type of phosphor that can store information generated by X-rays. When a photostimulable phosphor is excited by X-rays, electrons and holes are generated.
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 is the protective layer of photostimulable phosphor?
• A protective layer. This is a very thin, tough, clear plastic that protects the phosphor layer. • A phosphor layer (or active layer). This is a layer of photostimulable phosphor that “traps” electrons during exposure.
What makes up the phosphor layer of an imaging plate?
The imaging plate is run through a special laser scanner or CR Reader that reads and digitizes the image. Barium fluorohalide crystal doped with europium (BaFl:Eu)- Phosphor Layer Phosphor layer is composed of barium fluorohalide crystal doped with europium. Europium acts as an activator.
How is photo stimulable phosphor used in dental radiography?
Photo-Stimulable Phosphor (PSP) imaging is a digital technique for dental intra-oral radiography. This application uses an imaging plate similar to those used in diagnostic radiology for computed radiology applications to capture and store a latent radiographic image.
What kind of plastic is the phosphor layer made of?
This is a very thin, tough, clear plastic that protects the phosphor layer. • A phosphor layer (or active layer). This is a layer of photostimulable phosphor that “traps” electrons during exposure. It is usually made of phosphors from the barium fluorohalide family (e.g., barium fluorohalide, chlorohalide, or bromohalide crystals).