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Dental Assisting Radiology MN
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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
- film speed
- kVp
- 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
- film movement
- 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
