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Porto- Radiology
Quality Assurance in the Dental Office (ch.10)
45
Dentistry
Graduate
11/10/2012

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Cards

Term
what are quality control tests?
Definition
specific tests used to maintain and monitor dental x-ray equipment, supplies, and film processing.
Term
what kind of equipment and supplies are monitored?
Definition
dental x-ray machines
Dental X-ray film
screens and cassettes
viewboxes
Term
who performs inspections on dental x-ray machines and how ofter?
Definition
annuel tests can be done by dentist and dental auxiliary.
Term
who calibrates the dental x-ray machines?
Definition
must be calibrated by a qualified technician annually.
Term
how to test Dental x-ray film?
Definition
fresh film test:
unwrap one unexposed film from a newly opened box. Process film using fresh chemicals to process the unexposed film.
Term
if Film is good how should it look after the Fresh film test?
Definition
the processed film appears clear with a slight blue tint.
Term
what will film look like if it is expired, improperly stored, or exposed to radiation?
Definition
film is fogged
Term
How should Screens be checked for quality control?
Definition
Extraoral intensifying screens should be examined for dirt or scratches.
Screens should be cleaned monthly.
Term
How should Cassette holders by checked for quality control?
Definition
examine for worn closures, light leaks, and warping.
Term
what is the Film-screen contact test for screens and cassettes?
Definition
-Insert film in cassette holder
-Place a wire mesh test object on top of loaded cassette
-position PID with a 40-inch target film distance
-expose the film using proper settings
-Process film
-View dilm on a view box in a dimly lit room at a distance of 6 feet
Term
What is Adequate contact film-screen contact test?
Definition
-Uniform density of wire mesh image; good film screen contact. -areas of varying densities demonstrated poor film screen contact.
Term
what should the viewbox look like, and How should it be checked?
Definition
-should emit a uniform and subdued light
- periodically examine viewbox for dirt or discoloration.
Term
what needs to be checked for Film Processing?
Definition
-Darkroom Lighting
-processing equipment
-processing solutions
Term
how often should the dark room lighting be checked?
Definition
every 6 months
Term
when checking the dark room what are you looking for?
Definition
look for white light leaks
Term
what are a few ways to fix light leaks?
Definition
with weather stripping or black tape
Term
what is the coin test for a safelight?
Definition
Is used to test a safelight By:
-prepare darkroom
-prepare film, place a coin on an unwrapped, unexposed film
-turn on the safelight for 3 to 4 minutes
-remove the coin and process film
Term
what will a proper safelight yield in a coin test ?
Definition
no visible image is seen on the processed radiograph.
Term
what will an Improper safelight yield in a coin test?
Definition
if an image of the coin and a fogged background appear on the processed radiograph.
Term
what are the two types of processing?
Definition
manual and automatic
Term
how often should the processing equipment be monitored?
Definition
daily
Term
what should the temp of the water bath be in a manual processor?
Definition
not too hot and not too cold
Term
what are the 3 things to monitor daily with a manual processor?
Definition
temp of water, levels of processing solution and Accuracy of timer.
Term
what should be monitored daily with an Automatic Processor?
Definition
Circulating water, solution levels, replenishment system, and temp of solutions.
Term
how to test the Automatic processor with test films?
Definition
prepare films by unwrapping two unexposed film, expose one to light .
Process both films in the automatic processor
Term
when an Automatic processor is functioning properly what should the film test look like?
Definition
the unexposed film appears clear and dry and the exposed film appears black and dry.
Term
when an Automatic processor is nonfunctioning what should the film test look like?
Definition
If the unexposed film does not appear clear and dry and if the exposed film does not appear completely black and dry.
Term
How often should processing solutions be changed?
Definition
replenished daily and changed every 3-4 weeks.
Term
what does Developer solution do?
Definition
reduces the exposed silver halide crystals into black metallic silver and creates black areas on the radiograph.
Term
what are the ways to test developer strength?
Definition
1. Reference radiograph
2. Stepwedge radiographs
Term
what is a Reference Radiograph test?
Definition
Processed under ideal conditions, used to compare the film densities of radiographs that are processed daily.
Term
What are the 4 steps in a Reference Radiograph Test?
Definition
1. New/ fresh film
2. Expose film using correct exposure Factors
3. Process film using fresh chemicals at recommended time and temperature
4. View reference radiograph and daily radiographs side by side on a view box.
Term
what is Matched Densities when looking at a Reference Radiograph Test?
Definition
If densities of reference radiograph match with daily radiographs, developer solution strength is adequate.
Term
what is Unmatched Densities when looking at a Reference Radiograph Test?
Definition
Daily radiographs are lighter than reference radiographs, developer solution is either weak or cold.
Daily Radiographs are darker than reference radiographs, Developer solution is either too concentrated or too warm.
Term
what is a Stepwedge?
Definition
A device of layered aluminum steps that absorb varying amounts of x-ray.
Term
what do you do in a step wedge test?
Definition
1. Prepare film, use 20 films to create a supply for daily testing.
2. Place Step wedge on top of one film and expose the film, repeat with remaining films using same exposure factors.
3. Process one of the exposed films with fresh chemicals (standard film).
4. store the remaining exposed 19 films
5.Process one of the exposed step wedge film each day.
6. View the standard radiograph and the daily radiograph side by side on a view box and compare densities.
Term
Stepwedge Matched densities means what?
Definition
if densities match, the developer solution strength is adequate.
Term
Step Wedge Unmatched Densities means what?
Definition
if the density on the daily radiograph differs by more than two steps from the standard, the developer solution is depleted.
Term
what does Fixer solution do?
Definition
removes the unexposed silver halide crystals on the film resulting in "cleat" areas on the processed radiograph.
Term
How to check if the fixer solution is working with a film?
Definition
unwrap film and place in fixer solution, if the film clears its good.
Term
How do you know if the Fixer is fast clearing and still good?
Definition
film clears in 2 minutes, fixer is of adequate strength.
Term
How do you know when the Fixer solution is Slow clearing?
Definition
if the film, does not completely clear in 3-4 minutes, the fixer solution is depleted.
-Replace fixer solution before using processing equipment.
Term
what are the 8 things involved in Quality Administration Procedures?
Definition
-Management of the quality assurance plan
-Description of the plan
-Assignment of duties
-Monitoring schedule
-Maintenance schedule
-Record-Keeping log
-Plan for evaluation and revision
-in service training
Term
why is operator competence a big deal along with nondiagnostic radiographs?
Definition
-the dentist is responsible for the quality of diagnostic radiographs
-retakes expose the patient to additional radiation
-repeated operator errors should be recorded to help identify areas of remedial need
-processing errors cause unnecessary retakes.
Term
what are 3 tests we can do in the lab to check Quality control?
Definition
-Dark room like leak and safelight tests
-Radiology unit scatter radiation test
-Lead Apron and Thyroid collar Test
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