DA23.3H- Radiology

scatter radiation

A form of secondary radiation that occurs when an x-ray beam has been deflected from its path by interaction with matter

what type of holder can use for bisecting technique

ALL OF THE ABOVE ( DISPOSBLE BITE BLOCK ,HEMOSTATE, SNAPERRAY)

Weak radiation leaving the tube during exposure is prevented by the use of a/an:

Aluminum Filter

Which option below, best describes an ion?

An atom that has lost electrons

What is the negatively charged particle that is responisble for producing dental radiographs?

Electron

Foreshortening of the maxillary radiographic image results from:

Excessive vertical angulation

Quality control tests are used to monitor and maintain all the following except:

Exposure Technique

All extraoral and intraoral radiographs can be taken with the same type of x-ray unit.

False

Radiation leaks are always detectable by either taste or smell

False

The advantages of the bisecting technique outweigh the disadvantages

False

All x-ray machines made after 1974 must abide by ___________ guidelines that regulates performance standards.

Federal

What is the speed of electrons through a circuit referred to as?

Kilovoltage

What is the term for a pattern of stored energy on the exposed film that cannot be visibly seen?

Latent image

What radiation protection would be used on the patient?

Lead apron

What component of the x-ray tube head restricts the size of the x-ray beam?

Lead collimator

What component of a film packed is included to reduced back scatter that can cause film fogging?

Lead foil sheet

The cathode in the_________________________ terminal.

Negative

a full mouth survey for a x-ray dentureless patient would include what

PA NO BITE WINGS

The beam of radiation which is responsible for exposing the xray film is the:

Primary Radiation

general radiation

Produced when an electron hits the nucleus of a tungsten atom or passes very close to the nucleus of a tungsten atom.

Sensors that cannot be sterilized

Require complete coverage with disposable plastic sleeves for each patient

The following substance found in the emulsion of a film is responsible for an x-ray image:

Silver halide (nitrate) crystals

What is the recommended film size for the bisecting technique?

Size 2

The panoramic image is the preferred image for the detection of caries and periodontal disease. The panoramic image is preferred for the evaluation of eruption patterns, growth, and development.

The first statement is false, the second is true

Your patient has asked why you prefer digital imaging to film. Which of the following reasons would you tell her?

The image appears instantaneously for both of us to view.

Film speed is determined by:

The size of the silver halide crystals

What is the purpose of the fixer?

To stop the action of the developer

The amount of electrons passing through a cathode filament is determined by the:

ampere

what is an Ion

an atom that has lost electrons

Disadvantages of the bisecting technique include:

angulation problems and image distortion

When exposing periapical radiographs with the bisecting technique, always begin with the:

anterior teeth

character radiation

arises from the electronic transition in an excited atom.

what xray will we take to see the interproximal decay

bite wing

The material responsible for giving support and stiffness to the x-ray film is called:

cellulose acetate

what is the material that give the film stiffness and support

cellulose acetate

An exaggerated smile line is seen on the dental image if the patient's

chin is tipped down

A reverse smile line is seen on the image if the patient's

chin is tipped up

what part of the xray unit restricts the beam to 2.75 inches at the end of the cone

collimator

The overall blackness of the film is termed the:

density

When looking at amount of radiation needed for digital vs film x-ray, how do they differ?

digital requires less radiation than film to produce an image

Too little vertical angulation result in images that are:

elongated

an inccorect vertical angle to the PID causes what

elongation

The latent period in radiation biology is the period of time between:

exposure to x-radiation and clinical symptoms

weak radiation leaving the tube during exposer is prevented by the use of

filter

Too much vertical angulation results in images that are:

foreshortened

Radiation injuries that are not seen in the person irradiated but that occur in the future generations are temed:

genetic effects

Each panoramic unit has a(n) _______________ that is used to align the patient's teeth as accurately as possible

head positioner

When mA is decreased the exposure time is:

increased

Dental receptors placed inside the mouth are termed:

intraoral

In dental radiography the quality of the beam is conducted by:

kVp

what controls the speed of electrons going through a circut

kVp

is the cathode negative or positive

negative

Incorrect horizontal angulation results in images that are:

overlapped

incorrect horizontal angulation causes what

overlapping

the beam of radiation that is responsible for exposing the xray film

primary or direct

The coin test is conducted to determine:

proper safelighting

The function of the collimator used in the panoramic x-ray machine is to____________

restrict the size and shape of the x-ray beam

The bisecting technique is based on the:

rule of isometry

Radiation produced with high kilovoltage results in:

short wave lengths

what is the name of that stuff in the imusion of the film that is responsible for the x-ray image

silver halide crystals

mounting an upper bicuspid what would be a good landmark to look for

sinuses

what is the most commom film size

size 2

Which of the following is most susceptible to ionizing radiation?

small lymphocyte

what part of the intraoral camera goes inside the mouth

the wand

To avoid a lead apron artifact on a panoramic radiograph

use a lead apron without a thyroid collar, and place the lead apron low around the neck of the patient so that it does not block the x-ray beam.

which part of the digital camera show the image display prior to taking the image

view finder

what is the first the firt thing you should do after removing

wipe the saliva

Primary radiation

x-ray beam after it leaves the x-ray tube and before it reaches the object

Which of the following described the relationship of the central ray to the receptor in the paralleling technique?

90 degrees to the film and long axis of the tooth

Which describes the proper direction of the central ray in the bisecting technique?

90 degrees to the imaginary bisector

Film emulsion includes:

- Silver bromide - Silver iodide - Gelatin

The identification dot on the intraoral film is significant because:

- The dot indicates the patient's right or left - The dot determines film orientation - The dot is important in film mounting

Advantages of panoramic imaging include which of the following:

- The entire maxilla and mandible are seen on one image - It is easy and quick to learn how to expose a panoramic image. - Patients prefer panoramic images and are exposed to less radiation

Which of the following is an indication for the bisecting technique:

- When the patient states that is too painful to bite down on a bite block - When the patient has a shallow patient - When a rubber dam is placed

Digital imagin systems can be used for which images?

- bite-wing - panoramic - cephalometric

Which of the following is the recommended angulation for properly capturing a periapical film of the mandibular premolars?

-10 to -15

how many xrays are in a full mouth series

18

exposure to a dentureless patient cn be reduced to how much

25%

An occlusal receptor (size ____) may be used for some extraoral images.

4

The side of the patient's head is positioned adjacent to the cassette for what type of x-ray

Cephalometric

why is radiation considered harmful?

Cumulative

What is used to determine film orientation?

Identification dot

In the bisecting technique, the radiographer must visualize the plane that divides in half the angle formed by the receptor and the long axis of the tooth. This plane is termed the:

Imaginary bisector

Besides Gamma rays, what additional radiation wave from the EMR spectrum is considered harmful to tissue due to its wavelength?

Ultra-Violet

After removing an exposed film from the patient's mouth, the first thing you should do is:

Wipe saliva from the film

secondary radiation

X-radiation that is created when the primary beam interacts with matter

Which beam alignment device includes bite blocks, aiming rings, and indicator arms?

XCP