Xray - Outcome 4 Flashcards
What is an image receptor & what are the 3 types?
An image receptor is an object that records the information created by X-rays. There are currently three main kinds of dental image receptors available:
Traditional dental x-ray films
Phosphor plates (PSP)
Direct imaging sensors
What is a Latent Image ?
The transposed image is not visible; therefore, it is called a latent image. The term latent image only applies to traditional dental films and phosphor plates because these types of dental imaging receptors require some form of processing to turn the latent image into a visible image
The use of traditional dental x-ray films
Although there has been an increased deviation from the use of traditional dental X-ray films to digital forms of radiographic imaging, traditional dental X-ray films are still used. Traditional dental X-ray films have been adapted in size, emulsion, film speed, and packaging for dental uses. Most packets contain one film, although two films per packet are available in the event a duplicate is required
What are Phosphor Plates (PSP)?
Phosphor plates are digital imaging receptors that require processing through an electronic processor. The latent image will appear on the computer and the phosphor plate may be reused
What are direct digital sensors?
Direct digital sensors are digital imaging receptors that do not require processing because the image appears immediately on the computer screen after exposure
Two main categories of xray receptors used in dental?
The two main categories used are intraoral (in mouth) and extraoral (outside of mouth).
Intraoral receptors
Intraoral receptors are placed inside the mouth (intraorally) during the xray exposure. There are four (4) main sizes of intraoral receptors. Size 0, 1, 2, and 4 (also known as occlusal).
Intra-Oral Receptor Sizes
The size of patient as well as the type of intraoral radiograph being performed will determine the size of receptor that is used.
Size 0 - Pediatric bitewing & PA
Size 1 - Adult anterior or mixed dentition bitewing/PA
Size 2 - Adult posterior bitewings or PA
Size 4 - Occlusal images
Protection & Storage of Traditional Film
All traditional dental films, like photographic films, are sensitive to light, moisture, high temperatures, chemical fumes, and stray radiation; therefore, in support of quality assurance precautions for safeguarding them must be taken - to prevent film age fog
-Storage area should be cool and dry (50-70F)
-Older films should be used first (date on box)
-Ideally, film should be refrigerated & used per
expiration date
Use of Traditional Film
Immediately after exposure, the film is removed from the patient’s mouth, wiped thoroughly with a tissue, and dropped into a container outside of the operatory. Storing the films outside of the operatory protects the exposed film from additional exposure while other “exposures” are being made. It must be stored within a “safe” distance from further radiation. A safe distance is behind a barrier wall or a minimum of 6 feet away. After all exposures have been made, the films are then to be processed.
Protection & Storage of Phosphor Plates
Phosphor plates are not as light-sensitive as traditional film. However, if an image is on the phosphor plates, light exposure to the phosphor (blue) side will cause the image to fade over time. Therefore it is important to ensure that the phosphor side is hidden from light or processed as soon as possible
Protection & Storage of Direct Digital Sensors
Direct digital sensors are not light-sensitive. However, to increase their longevity, they should be stored in a way that decreases the risk of being dropped and the kinking of wires
Components of Intra Oral Film
-Waterproof outer package
-Black paper.
-Film.
-Lead foil backing
What is the function for each layer of the dental film?
Waterproof outer package - Protects the film from saliva and exposure to light.
Black paper - Shields/protects the film from light.
Film - Where the image is produced.
Lead foil packaging - Shields the film from secondary radiation that results in film fog.
What size of film would you use for an adult bitewing xray?
Size #2
