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Dental Assisting Radiology MN Licensure Questions and Answers, Exams of Radiology

A comprehensive set of questions and answers related to dental assisting radiology in minnesota. It covers various aspects of dental radiography, including radiation safety, exposure techniques, film processing, and image interpretation. Designed to help dental assisting students prepare for their licensure exam.

Typology: Exams

2024/2025

Available from 01/18/2025

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Dental Assisting Radiology MN
Licensure Questions and Answers 100%
Pass
This is a device used to reduce the amount of scatter radiation that reaches an extraoral film
during exposure. ✔✔grid
Identify the error that causes teeth to appear foreshortened on a radiograph. ✔✔excessive
vertical angle
Identify the benefit of using a long-cone (16 inch) position-indicating device, versus a short-cone
(8inch) position indicating device. ✔✔less magnification
What is the angulation of the central ray when using the bisection angle technique? ✔✔90
degrees to the imaginary bisector
The clearing test is used for checking the: ✔✔fixer solution
The step-up transformer is activated by the: ✔✔exposure button
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Dental Assisting Radiology MN

Licensure Questions and Answers 100%

Pass

This is a device used to reduce the amount of scatter radiation that reaches an extraoral film during exposure. ✔✔grid

Identify the error that causes teeth to appear foreshortened on a radiograph. ✔✔excessive vertical angle

Identify the benefit of using a long-cone (16 inch) position-indicating device, versus a short-cone (8inch) position indicating device. ✔✔less magnification

What is the angulation of the central ray when using the bisection angle technique? ✔✔ 90 degrees to the imaginary bisector

The clearing test is used for checking the: ✔✔fixer solution

The step-up transformer is activated by the: ✔✔exposure button

If the intensity of a beam of radiation is given a value of "12" at a point 12 inches from the target the intensity of the beam at 24 inches from the target would be: ✔✔ 3

Which type pf PID (positioning indicating device) is most effective in reducing patient exposure? ✔✔rectangular

Which of the following describes the use of a filter in a dental x-ray machine?

a. a filter removes low-energy x-rays

b. a filer decreases the mean energy of the beam

c. a filer reduces the size and shape of the beam

d. a filer removes the dose of radiation to the thyroid gland ✔✔a. filter removes low-energy x- rays

Which of the following is used as a collimator?

a. lead plate

b. aluminum plate

c. copper plate

d. molybdenum cup ✔✔a. lead plate

What exposure factor has a direct influence on the contract of a dental radiograph? ✔✔operating kilovoltage peak

The paralleling technique produces an image with: ✔✔decreased distortion

When utilizing the paralleling technique, what change in angulation should be made for a patient that has an unusually shallow palate? ✔✔vertical angle is increased

To eliminate cone-producing scatter radiation it is best to use: ✔✔a long PID

The thermometer for manual processing should be placed in the: ✔✔developer solution

The most effective method of reducing a patient's exposure to x-radiation is to: ✔✔use fast film

Which of the following describes the use of a filter in a dental x-ray tubehead:

a. removes low energy x-rays

b. removes high energy x-rays

c. reduces the size and shape of the beam

d. stops the radiation from reaching the thyroid gland ✔✔a. removes low energy x-rays

A reference radiograph is used to check: ✔✔film densities of radiographs

During a production of x-rays, less than ____ percent of the energy is actually converted into x- rays. ✔✔1%

Which of the following describes correct sequence during automatic film processing:

a. develop, rinse, fix, wash, dry

b. fix, develop, wash, dry

c. develop, fix, wash, dry

d. develop, wash, fix, dry ✔✔c. develop, fix, wash, dry

The coin test is used to check: ✔✔proper safelighting conditions

How do you compensate when processing films and the developer is 5 degrees warmer than then ideal temperature? ✔✔decrease developing time

How do you protect the thyroid gland? ✔✔A lead thyroid shield or the lead collar on the apron

Film size numbers? ✔✔0-1-2-3-

List four things that determine the exposure time? ✔✔1. the area being radiographed

  1. film speed
  2. kVp
  3. focal film distance

The intensifying screen within an extra-oral cassette will? ✔✔increase the image sharpness

Which radiographic exposure technique can be used to locate an object in the buccolingual dimension? ✔✔occlusal

What type of illumination is allowed in the darkroom while opening a film packet? ✔✔safelight

When taking an occlusal film, the patient's mouth is____. ✔✔closed

At identical settings, the source to film distance which most reduces the amount of radiation received by a patient is ___ inches. ✔✔ 16

Restriction of the size of the useful beam is best controlled by? ✔✔collimation (the lead diaphragm)

Which cells of the body are least susceptible to x-ray? ✔✔muscle cells

What is the proper head position for bitewings films? ✔✔Midsagittal plane is perpendicular to the floor and the maxillary occlusal plane parallel to the floor.

The zygomatic arch is most likely to be superimposed upon the roots of the max molar radiographs when the? ✔✔The positive VA is too great

Exposure time for a radiograph on a small child would be? ✔✔Less than an adult (1/3 reduction of the adult exposure)

To increase the penetrability of x-rays, increase? ✔✔kVp

How do you prevent static electricity? ✔✔unwrap the film slowly

Radiographs left over night in the fixer will appear? ✔✔clear

A radiograph developed at a higher temperature will appear? ✔✔darker

If a patient has a tendency to gag, which film would you take first? ✔✔maxillary centrals

What are the 2 proper storage techniques for a lead apron? ✔✔hung up or laying flat

Exposure to x-ray radiation can be reduced for a patient by using a film with a ____ speed. ✔✔faster

The operator should stand at least ___ feet from the 90 degrees to the _____. ✔✔6, tubehead

On a radiograph, the pulp appears____. ✔✔radiolucent

Improper horizontal beam alignment will result in ____. ✔✔overlapping (white crescent marks)

List three things that causes blurred images: ✔✔1. patient movement

  1. film movement
  2. tuebehead movement

Black crescent shaped marks on an x-ray are caused by? ✔✔bending

Cone cutting on a radiograph is prevented by? ✔✔Centering the center ray

Decreasing the kVp would increase the contract of an x-ray. Some tips:

a. decrease the kVP= increase the contrast

b. increase the kVp- decrease the contrast

c. decrease mA= decrease the density

d. increase mA= increase the density ✔✔

What three things would you do to increase the density of an x-ray? ✔✔1. increase the exposure time

Digital sensors are 50-80% faster than e speed film ✔✔

How much is the maximum a year that a technician can get? ✔✔5 REMS/year

safelight tests done: ✔✔done quarterly

stepwedge tests done: ✔✔test solutions done daily

crabtree tests done: ✔✔done daily instead of a stepwedge is using a digital pan machine

Double the distance, exposure is ___ times the amount? ✔✔ 4

What size film is used for a child's occlusal film? ✔✔#

Which rad technique is best for a gagger? ✔✔I would say bisecting because paralleling touches the midline area in the posterior films

Which rad technique is best for a shallow palate and tori? ✔✔Bisecting because you increase the VA

What film speed has a green backing? ✔✔D

Most sensitive organ- liver, kidney, salivary gland, or thyroid? ✔✔salivary gland

What is the purpose of the lead foil? ✔✔prevents backscattered radiation