Radiology Midterm
Who can be held legally responsible for a dental assistant's actions?
Both the dentist and assistant
One of the rules of radiation protection is to never stand closer than ___________ feet from the x-ray unit during an exposure unless you are behind a barrier.
6
Quality control for the darkroom should include checking for light leaks every :
6 months
F-speed dental x-ray film reduces radiation exposure to the patient by __% compared with D-speed dental x-ray film.
60
When developer solution in an automatic processor is warmer than 83 degrees, the film will appear:
Darker
Which is the first step in developing an administrative quality control plan?
Develop and maintain a written description of the quality assurance plan
The category of digital imaging similar to faxes and video equipment that uses a sensor with a cord attached to the computer is:
Direct digital imaging
Developer strength can be checked by using
A reference image and stepwedge image
The use of dental images include the detection of:
Abnormalities in the surrounding hard and soft tissues
What is the purpose of the insulating oil the x-ray machine housing and surrounds the x-ray tube?
Absorbs the heat from the production of x-rays
Positioning instruments in digital radiography:
Assist in film placement and keep the patient's fingers from being exposed.
All of the following statements are true Statements regarding the preparation of the radiography operatory for dental imaging EXCEPT :
Barriers do not need to be used because spatter of blood and saliva is unlikely
The penetrating power of the x-ray beam is controlled by the settings on the:
Kilovoltage
A lead apron and thyroid collar:
Must be used on all patients for all exposures
Dental patient records must contain documentation of the _________ images taken.
Number and type
The dentist credited making the first dental radiograph in 1895 is:
Otto Walkoff
The purpose of a lead foil sheet in the film packet is:
Reduce film fogging
The lead collimator is used to:
Restrict the shape and size of the primary beam
Each of the following must be disclosed to the patient before obtaining informed consent for dental radiographs except one. Which one is the EXCEPTION?
Rights of the patient as owner of the images
Which of the following statements is true concerning the structure of an atom?
The orbital path of an electron around the nucleus is called an electron shell
Transporting PSP films should be done by placing them in:
a black transfer box
Consumer-Patient Radiation Health and Safety Act
a federal law that requires persons who take dental radiographs to be properly trained and certified
Calibration of dental x-ray equipment should be performed by:
a qualified technician
According to the test for x-ray film freshness, the film is fresh and has been properly stored and handled when the processed film appears clean with a slight ______ tint
blue
Damage caused by ionizing x-radiation to genetic cells:
can affect future generations
The safest place to store unopened boxes of dental film is in the:
darkroom
Who is responsible for overall quality assurance in a dental practice ?
dentist
Given normal use, processing solutions should be changed:
every 3-4 weeks
_______ hardens the film emulsion during film processing.
fixing
A plastic or metal film cassette holds and protects the extraoral film. During exposure, the side of the cassette the must face the patient is the _____ side.
front
Faster film speed would be associated with _____ silver halide crystals, a _______ emulsion, and presence of special radiosensitive dyes.
larger and thicker
When film emulsion interacts with x-rays, the result is:
latent image
Solutions should have been changed in the processor 1 week ago. Continuing to use exhausted developer will result in ____ films.
light
The most critical component in film processing quality control is:
maintaining the freshness of the processing solutions
The degree of density or blackness on an image is controlled by the
milliampere-second(s)
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.
Failure to obtain informed consent from a patient prior to exposure of dental radiographs can lead to charges of:
negligence
Thermionic emission refers to:
release of electrons from the tungsten filament
In dentistry, the ___________ the wavelengths of the x-rays, the greater their energy and their usefulness.
shorter
Quality assurance in the dental office is a way of ensuring that everything possible is being done to produce high quality diagnostic images and includes quality control:
tests and administration procedures
The recommended distance between the safelight and where the films are unwrapped is:
4 feet
What happens when the exposure button on a dental x-ray machine is pressed?
Electrons slam against the target of the anode producing the x-ray.
One of the earliest signs of overexposure to x-rays is:
Erythema
The silver halide crystals are located within which of the following layers of the radiographic film?
Gelatin that suspends the emulsion
All of the following statements are true regarding the care of intensifying screens and cassettes except:
Screens should be cleaned with a commercial cleaner after each use
According to the Center for Disease Control (CDC) Guidelines for Infection Control in Dental Healthcare Settings -2003, digital radiography sensors:
Should use FDA cleared barriers
All of the following statements are true about film badges EXCEPT:
they should be worn when any form of x-ray is taken
All of the following is true about storage plates used with phosphor storage plate imaging systems EXCEPT that:
they utilize radio frequency transmission to transmit the image to the computer via radio waves
When a daily radiograph is lighter than the reference radiograph, it indicates the developer is too:
weak
Following the removal of an exposed film or PSP from a patient's mouth, the film/ PSP should be:
wiped free of saliva using a dry 2x2 inch gauze sponge or paper towel