Porto- Radiology Flashcards

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
terminus

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
terminus

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
condition

what are the 3 things to monitor daily with a manual processor?
Definition

temp of water, levels of processing solution and Accuracy of timer.
condition

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.
condition

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.
terminus

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.
terminus

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.
condition

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.
condition

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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