Xray

Question 1

Secondary radiation

Answer 1

refers to x-radiation that is created when the primary beam interacts with matter.

Question 2

Which of the following is the basic form of matter?

Answer 2

An atom

Question 3

The x-ray was discovered in 1895 by

Answer 3

Wilhelm Conrad Roentgen.

Question 4

The component of the x-ray machine that functions in positioning the tubehead is the

Answer 4

extension arm.

Question 5

The dentist who is credited making the first dental radiograph in 1896 is

Answer 5

Otto Walkhoff.

Question 6

All of the following structures will appear radiolucent on dental x-ray film except

Answer 6

metal restorations.

Question 7

In dentistry, the __________ the wavelengths of the x-rays, the greater their energy and their usefulness.

Answer 7

shorter

Question 8

The range of shades of gray between black and white on an image is called

Answer 8

contrast.

Question 9

Which of the following statements is true concerning the structure of the atom?

Answer 9

The orbital path of an electron around the nucleus is called an electron shell.

Question 10

The heart of the x-ray generating system is the

Answer 10

x-ray tube.

Question 11

The uses of dental images include the detection of

Answer 11

abnormalities in surrounding hard and soft tissues.

Question 12

Exposure to radiation

Answer 12

no matter how small, has the potential to cause harmful biologic changes.

Question 13

Positioning instruments in digital radiography

Answer 13

assist in film placement and keep the patient’s fingers from being exposed.

Question 14

The life of the automatic processer solutions is reduced rather than extended when

Answer 14

more time has elapsed since the last complete change of processing solutions.

Question 15

Green-sensitive extraoral film is used with cassettes that have which type of intensifying screen?

Answer 15

Rare earth

Question 16

White or light (clear) spots on a processed film can be caused by

Answer 16

fixer solution contacts film prior to processing.

Question 17

The ideal time and temperature for manual developing is

Answer 17

5 minutes at 68°F.

Question 18

Digital radiography requires less radiation than traditional radiography because the

Answer 18

sensor is more sensitive to x-ray energy.

Question 19

The category of digital imaging similar to faxes and video equipment that uses an intraoral sensor with a cord attached to the computer is

Answer 19

direct digital imaging

Question 20

Which of the following time and temperature errors will result in reticulation of the film emulsion?

Answer 20

Sudden temperature change between developer and water bath

Question 21

Each of the following is true about digitizing film-based radiographic images except

Answer 21

digitized film-based images cannot be enhanced by computer software.

Question 21

All of the following are true statements about phosphor storage plate (PSP) imaging system imaging plates except they

Answer 21

should be autoclaved.

Question 22

All of the following are true statements about storage plates used with phosphor storage plate (PSP) imaging systems except that

Answer 22

they utilize radio frequency transmission to transmit the image to the computer via radio waves.

Question 22

When loading an extraoral film into the cassette prior to exposure,

Answer 22

the procedure must be done in the darkroom.

Question 23

Automatic film processing requires _____ than manual film processing does

Answer 23

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.

Question 24

The __________________ removes unexposed silver halide particles and hardens the emulsion.

Answer 24

fixer

Question 25

Which of the following is NOT an advantage of digital radiography?

Answer 25

It doesn’t require a film holder for use.

Question 26

The smaller the silver halide crytals in the film’s emulsion

Answer 26

…the more radiation needed for each exposure.

Question 27

Which system uses thin, reusable sensors that require optical scanning to obtain an image?

Answer 27

Storage phosphor imaging

Question 28

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.

Answer 28

False

Question 29

Which of the following characteristics of the silver halide crystals in the film’s emulsion is most likely to reduce patient exposure to radiation?

Answer 29

Larger silver halide crystals

Question 30

How does the tubehead for a digital radiography system differ from a film-based system?

Answer 30

The tubeheads are exactly the same for both digital and film-based systems.

Question 31

Film and digital sensors have similar components, though the digital sensor is sealed to prevent the silver halide from light.

Answer 31

False

Question 32

Because of the reduced exposure to x-rays associated with digital radiography systems, no lead apron is necessary

Answer 32

False

Question 33

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

Answer 33

False

Question 34

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?

Answer 34

The patient’s tissues will be exposed unnecessarily to radiation

Question 35

Which of the following is NOT an advantage of digital radiography?

Answer 35

It is less expensive.

Question 36

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?

Answer 36

Intensifying screen used during exposure

Question 37

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

Answer 37

Use double film packets when obtaining the full mouth series to share with the specialist