What is the use of cassette in radiography?

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.

What is mammography cassette?

Procedures. The two types of imaging currently used for mammography are. Screen-film mammography where x-rays are beamed through the breast to a cassette containing a screen and film that must be developed. The image is commonly referred to as a mammogram.

What is the function of cassette?

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.

How many types of cassette are there?

Since then, the four cassette tape types were known as IEC I, IEC II, IEC III and IEC IV.

Why is there lead in the back of a cassette?

DEFINITION: A flat, light-tight container in which x-ray films are placed for exposure to ionizing radiation and usually backed by lead to eliminate the effects of back scatter radiation. Cassettes are used in association with intensifying screens and have related FUNCTIONS: 1.

What is single screen cassette?

In the case of conventional radiography, two screens are mounted, one on each side of the cassette, except in mammography, where a single screen is mounted on the back side. These cassettes have to be loaded with film in the darkroom unlike the cassettes used in CR which can be loaded with a imaging plate in the light.

What is the difference between Type 1 and Type 2 cassette tapes?

Type I tapes must be recorded with ‘normal’ (low) bias flux and replayed with 120 μs time constant. Quality Type I cassettes have higher midrange MOL than most Type II tapes, slow and gentle MOL roll-off at low frequencies, but less treble headroom than Type II.

What can damage cassette tapes?

The most damaging exposure involves salt water, sewage, sugar or chlorinated tap water. Extended exposure to water can eventually destroy magnetic tapes. Uneven drying or exposure to heat can cause tapes to deform. Incomplete or partial drying can result in damaging fungal growth.

What is fast screen cassette?

Andrew Murphy ◉ and Dr Ayush Goel ◉ et al. 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.

How do I know my cassette size?

Sprockets vary in size according to the number of teeth they have. A cassette may therefore be sized as 11-32t. The first number refers to the number of teeth on the smallest sprocket (the highest gear, for fast pedalling at speed) and the second number to the biggest sprocket (the lowest gear, for climbing hills).

What are the functions of a radiographic film cassette?

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.4-4-2011 RADIOGRAPHIC CASSETTES BY SUDIL 2. 3. Functions1.

What is the back side of a cassette?

Cassettes are rigid holders used in conventional and computed radiography (CR) for the screen film system and imaging plate respectively. The back side of the cassette has rubber or felt for adequate contact between the screen film system or with the imaging plate.

Who is the creator of the radiographic cassette?

1. Presented by: Sudil Paudyal B.Sc.MIT 1st yr. Roll no.514-4-2011 RADIOGRAPHIC CASSETTES BY SUDIL 1 2.

How are computed radiography and digital radiography used?

These have now been replaced by digital radiography. There are two different techniques: computed radiography and digital radiography. 1. Computed radiography Cassettes are used that have a phosphor screen.