Xray Flashcards
Secondary radiation
refers to x-radiation that is created when the primary beam interacts with matter.
Which of the following is the basic form of matter?
An atom
The x-ray was discovered in 1895 by
Wilhelm Conrad Roentgen.
The component of the x-ray machine that functions in positioning the tubehead is the
extension arm.
The dentist who is credited making the first dental radiograph in 1896 is
Otto Walkhoff.
All of the following structures will appear radiolucent on dental x-ray film except
metal restorations.
In dentistry, the __________ the wavelengths of the x-rays, the greater their energy and their usefulness.
shorter
The range of shades of gray between black and white on an image is called
contrast.
Which of the following statements is true concerning the structure of the atom?
The orbital path of an electron around the nucleus is called an electron shell.
The heart of the x-ray generating system is the
x-ray tube.
The uses of dental images include the detection of
abnormalities in surrounding hard and soft tissues.
Exposure to radiation
no matter how small, has the potential to cause harmful biologic changes.
Positioning instruments in digital radiography
assist in film placement and keep the patient’s fingers from being exposed.
The life of the automatic processer solutions is reduced rather than extended when
more time has elapsed since the last complete change of processing solutions.
Green-sensitive extraoral film is used with cassettes that have which type of intensifying screen?
Rare earth
White or light (clear) spots on a processed film can be caused by
fixer solution contacts film prior to processing.
The ideal time and temperature for manual developing is
5 minutes at 68°F.
Digital radiography requires less radiation than traditional radiography because the
sensor is more sensitive to x-ray energy.
The category of digital imaging similar to faxes and video equipment that uses an intraoral sensor with a cord attached to the computer is
direct digital imaging
Which of the following time and temperature errors will result in reticulation of the film emulsion?
Sudden temperature change between developer and water bath
Each of the following is true about digitizing film-based radiographic images except
digitized film-based images cannot be enhanced by computer software.
All of the following are true statements about phosphor storage plate (PSP) imaging system imaging plates except they
should be autoclaved.
All of the following are true statements about storage plates used with phosphor storage plate (PSP) imaging systems except that
they utilize radio frequency transmission to transmit the image to the computer via radio waves.
When loading an extraoral film into the cassette prior to exposure,
the procedure must be done in the darkroom.
Automatic film processing requires _____ than manual film processing does
less equipment Automatic film processing requires less time and less equipment than manual film processing. Automatic film processing requires only 4 to 6 minutes to develop, fix, wash, and dry a film, whereas manual processing and drying techniques require approximately 1 hour.
The __________________ removes unexposed silver halide particles and hardens the emulsion.
fixer
Which of the following is NOT an advantage of digital radiography?
It doesn’t require a film holder for use.
The smaller the silver halide crytals in the film’s emulsion
…the more radiation needed for each exposure.
Which system uses thin, reusable sensors that require optical scanning to obtain an image?
Storage phosphor imaging
The latent image is what is seen on exposed film as a faint outline of the dental structures when viewed with a bright light prior to processing the film.
False
Which of the following characteristics of the silver halide crystals in the film’s emulsion is most likely to reduce patient exposure to radiation?
Larger silver halide crystals
How does the tubehead for a digital radiography system differ from a film-based system?
The tubeheads are exactly the same for both digital and film-based systems.
Film and digital sensors have similar components, though the digital sensor is sealed to prevent the silver halide from light.
False
Because of the reduced exposure to x-rays associated with digital radiography systems, no lead apron is necessary
False
One of the advantages of a direct digital system is that it cuts the amount of radiation considerably for the patient. As a result, the dentist can repeat each patient exposure multiple times so as to have copies to send to the insurance company or any specialists
False
Due to a manufacturer defect, you notice that the new box of discounted film that you purchased was lacking lead foil in each packet. How would this impact the radiographs that you take?
The patient’s tissues will be exposed unnecessarily to radiation
Which of the following is NOT an advantage of digital radiography?
It is less expensive.
Your series of radiographs on Ms. Smith emerge from the automatic processor and they are all darker than usual. Which of the following is not a possible cause of this?
Intensifying screen used during exposure
Your office still uses a film-based system for radiographs. Ms. Chin is a new patient who will need a referral to a periodontist for periodic treatment of her moderate periodontal disease. What modification to your technique would you employ in this situation
Use double film packets when obtaining the full mouth series to share with the specialist
