It is made of stainless steel with a bakelite plate on the front side (not shown). Needless to say, the front is made of a low atomic number material so as not to attenuate the X-rays. The cassette identifies the dates of two patents: 1-1-29 and 4-9-35.
What are X-ray film cassettes?
An X-ray cassette is a light-resistant container that protects the film from exposure to daylight, holds the film between two intensifying screens and allows the passage of X-rays through the front cover on to the film.
How does an X-ray cassette work?
Instead of traditional x-ray film, computed radiography cassettes use photo-stimulated luminescence screens to capture the X-ray image . The computed radiography cassette goes into a reader, which converts the stored data into a digital image.
What is extra oral cassette?
Extraoral Cassette with Screens features Double latch opening and closing . Uniform screen/film contact from specially designed back panel and fitted foam lining. Standard quality construction. Lead shielding to reduce backscatter for sharper images.
Why a cassette is used in radiology?
Cassettes are used in association with intensifying screens and have related FUNCTIONS: 1. To contain a film 2. to exclude light, 3. to maintain the film in close, uniform contact with both screens during the exposure, 4. to protect the intensifying screens from physical damage.
What is Non screen xray film?
Non-screen – Those with emulsions more sensitive to direct exposure of X – rays . These are primarily used as intraoral films and provide excellent image quality.
What is a film cassette?
A film cassette is a container for exposed or unexposed film .
What is cassette in radiography PPT?
Introduction A radiographic film cassette is a rectangle or square plastic or metallic container used to hold x-ray films (exposed or unexposed) and intensifying screens in close and uniform contact with one another .
What is the difference between CR and DR in radiography?
DR uses flat panel detectors based on direct or indirect conversion of X-rays to charge, which is then processed to produce a digital image. CR uses cassette-based phosphor storage plates (PSP), which are then scanned by the computerized system into a digital format for image processing, archiving, and presentation.
What is the difference between direct and indirect digital radiography?
“Direct digital” refers to sensors that send a digital image directly to a computer and is also knows as DR or digital radiography. “Indirect digital” uses reusable phosphor coated plates that are run through a scanner to obtain the digital image which is then sent to the computer.
What are the disadvantages of digital radiography?
The main disadvantages of direct digital radiography are the thickness and rigidity of the digital detector, infection control, hardware and software maintenance, and the higher initial cost of the system .
What does CBCT stand for?
Description. Cone-beam computed tomography systems (CBCT) are a variation of traditional computed tomography (CT) systems. The CBCT systems used by dental professionals rotate around the patient, capturing data using a cone-shaped X-ray beam.
What are the names of extraoral films?
Examples of common extraoral films include panoramic and cephalometric films . A panoramic film shows a panoramic (wide) view of the upper and lower jaws on a single radiograph. A cephalometric film shows the bony and soft-tissue areas of the facial profile.
What type of film is used for duplication?
Duplicating film is single emulsion film . In the darkroom, the one side of the film will appear lighter than the other side of the film. The lighter side of the film must be placed toward the light in the duplicating machine.
Do they still sell cassette players?
Yes! Many manufacturers are still producing cassette tape players today , both portable and stationary. You can choose from different brands and models if you buy online.
What are the 5 sizes of radiographic cassettes?
The formats of the cassettes used in conventional radiology are: 13 x 18 cm; 18 x 24 cm; 24 x 30 cm; 20 x 40 cm; 30 x 40 cm; 35 x 35 cm; 35 x 43 cm; 30 x 90 cm. No cassette is used in digital radiography.
How many types of cassettes are there?
Since then, the four cassette tape types were known as IEC I, IEC II, IEC III and IEC IV. The numerals follow historic sequence in which these types were commercialized, and do not imply their relative quality or intended purpose.
How many years an original radiograph is stored?
Obviously, the space requirements and expense of storage create a desire to purge records when it is safe to do so. Balancing this, many authorities recommend retaining x-rays for 10 years , although other authorities recommend keeping them almost indefinitely.
What is the purpose of an intensifying screen in an extra oral cassette?
Intensifying screens are used in the x-ray cassette to intensify the effect of the x-ray photon by producing a larger number of light photons . It decreases the mAs required to produce a particular density and hence decreases the patient dose significantly.
What is cassette with intensifying screen?
Intensifying screens are used in the x-ray cassette to intensify the effect of the x-ray photon by producing a larger number of light photons . It decreases the mAs required to produce a particular density and hence decreases the patient dose significantly.
What is PID in dentistry?
The X-rays then travel through the PID ( positioning indicator device ) where the X-ray beam exposes the receptor. The X-ray head and the PID are lead lined to contain the X-rays and prevent unnecessary radiation exposure to the patient and the operator. The PID is also called a cone. 1.
What are Filmgraphers in radiography?
Film holders are devices designed to hold the film in a stable position within the patient’s mouth , avoiding the need to hold the film by hand.
What is the fixed distance between xray tube and cassette?
| Inches CM | 11′′ x 14′′ 25 x 34 cm | 14′′ x 17′′ 34 x 43 cm | 7′′ x 17′′ 17 x 43 cm | 14′′ x 14′′ 34 x 34 cm |
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What are radiographic grids?
Grids are placed between the patient and the x-ray film to reduce the scattered radiation reaching the detector (produced mainly by the Compton effect) and thus improve image contrast.
