What is latent image in radiography?

What is latent image in radiography?

The latent image is the invisible product of x-ray or photographic film emulsions, build after radiation or light exposure. The visible image is developed and fixed chemically from the latent image. Latent images are also produced in a photostimulable storage phosphor and retrieved by scanning with a laser.

How many sizes of dental film are commonly used?

Dental film is available in six speeds, labelled A, B, C, D, E and F. Only D, E and F are used in practice with E (or “Ektaspeed” ) being the preferred speed, in order to reduce radiation exposure to operatives and patient.

How long should you wait between films when feeding them into an automatic unit?

10 seconds. How long should you wait between films when feeding them into an automatic unit? Fill them with black paper. What should you do with extra spaces in a film mount?

How many light sources are required in every darkroom?

Two levels of lighting should be available in the darkroom. A strong white light should be provided by surface-mounted incandescent fixtures. Fluorescent bulbs tend to emit a long afterglow that may fog films if they are switched off just before the films are unloaded or loaded.

What function of a computer is mostly responsible for turning data into information?

The central processing unit consists of electronic circuits that interpret and execute program instructions, as well as communicate with the input, output, and storage devices. It is the central processing unit that actually transforms data into information. Data is the raw material to be processed by a computer.

What is the technical name for a computed radiography imaging plate?

Sometimes called “film replacement technology”, Computed Radiography (CR) uses a flexible phosphor Imaging Plate (IP) to capture digital images instead of conventional photographic film.

What is the difference between fast scan and slow scan?

What is the difference between fast scan and slow scan? Fast scan is the rapid back and forth of the laser beam. Slow scan is the mechanical drive of the imaging plate through the reader.

How often should digital imaging plates be replaced?

Conclusions: 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.

Which of the following is a phosphor most likely to be used in an indirect digital radiography system?

1 The phosphor most likely to be used in indirect digital radiography is: BaFlBr:Eu.

What are the advantages and disadvantages of digital radiography?

List of Pros of Digital Radiography

• It is faster to process and provides more options.
• It provides images with better quality.
• It requires less resources.
• It decreases the need for retakes.
• It is expensive initially.
• It may require constant replacement of equipment.
• It requires new knowledge and skills.

What are the two types of digital radiography?

There are two types of digital imaging systems used in intraoral radiography – computed radiography (CR) and direct radiography (DR).

What are the advantages of digital radiography?

Digital Radiography Advantages: Reducing Cost and Space

• Reduced radiation.
• Reduced cost due to the elimination of chemical processors, processor maintenance, and filing and mailing jackets.
• Reduced space requirement — no dark room is required, and the need to dedicate space for cabinets of analog images is eliminated.

What are the disadvantages of digital imaging?

Disadvantages of Intraoral Digital Imaging

• Costs5 – the initial costs associated with digital equipment is one major disadvantage with dental practices.
• Patient Comfort5 – direct sensors are hard and not flexible like film.
• Medico-legal5 – concerns regarding manipulating images has been addressed by manufacturers.

What is the difference between digital and computed radiography?

Computed radiography (CR) cassettes use photo-stimulated luminescence screens to capture the X-ray image, instead of traditional X-ray film. Digital radiography (DR) systems use active matrix flat panels consisting of a detection layer deposited over an active matrix array of thin film transistors and photodiodes.

What are the benefits of radiography?

Benefits

• noninvasively and painlessly help to diagnose disease and monitor therapy;
• support medical and surgical treatment planning; and.
• guide medical personnel as they insert catheters, stents, or other devices inside the body, treat tumors, or remove blood clots or other blockages.

What are the cons of being a radiologist?

Radiologists may sit more to work on the computer and confer by phone with other physicians. Another negative of both careers is seeing patients who are ill, sometimes through a recurrence of illness, which can take a toll on mental health and outlook.

What is an advantage of a CT scan over an MRI?

Both MRIs and CT scans can view internal body structures. However, a CT scan is faster and can provide pictures of tissues, organs, and skeletal structure. An MRI is highly adept at capturing images that help doctors determine if there are abnormal tissues within the body.

What are the advantages of a CT scan?

Benefits of CT include more effective medical management by:

• determining when surgeries are necessary.
• reducing the need for exploratory surgeries.
• improving cancer diagnosis and treatment.
• reducing the length of hospitalizations.
• guiding treatment of common conditions such as injury, cardiac disease and stroke.

What are the disadvantages of a CT scan?

In general, a CT scan has the advantage of short study time (15 to 20 minutes) with high quality images. However, disadvantages include the need for ra- diation exposure and the use of a contrast material (dye) in most cases, which may make it inappropriate for patients with significant kidney problems.

Are CT scans better than ultrasounds?

In terms of procedures, ultrasound is used in prenatal care, removal of gall stones, kidney stones, and many other types of medical applications. In both cases, CT and ultrasound are often preferable over regular x-rays. The CT offers a much better image and it can be directed precisely at a target area.

What are the risks of a CT scan?

Are There Any Risks? CT scans use X-rays, which produce ionizing radiation. Research shows that this kind of radiation may damage your DNA and lead to cancer. But the risk is still very small — your chances of developing a fatal cancer because of a CT scan are about 1 in 2,000.