Dental Imaging Ch10

The coin test is used to check___ a)proper safelighting b)strength of the processing solution c)film density d)film-to-screen contact e)beam collimation

a)proper safelighting

How far away must a film be unwrapped from a safelight?

at least 4 feet

After processing, fresh film that has been properly stored and protected will appear ___. a) fogged b)clear with a light blue tint c)clouded with a blue tint d)dark blue e)totally black

b) clear with a light blue tint

One the average, processing solutions should be changed ___. a)once each day b)once each week c)every 3 to 4 weeks d)every 8 to 10 weeks e) every 3 to 4 months

c)every 3 to 4 weeks

Film processing required daily monitoring

...

When a fixer is at full strength, a film should clear within how many minutes?

2 minutes

The darkroom should be checked for safelighting every how many months?

6 months

After performing the film-screen contact test, a wire mesh image of uniform density appears. These results indicate ____. a)adequate film-screen contact b)inadequate film-screen contact

A) adequate film-screen contact

BACK OF THE CHAPTER QUESTIONS

BACK OF THE CHAPTER QUESTIONS

How should the strength of the developer be checked?

Compare film densities to a standard. -Reference radiograph -Stepwedge Radiograph -Normalizing device

Stepwedge

Composed of aluminum steps. Standard stepwedge radiograph View standard radiograph and daily radiograph Use the middle density for comparison If density differs by more than 2 steps, develope solution is depleted.

Basic elements of a quality administration program

Decription of the plan Assignment of duties Monitoring schedule Maintenance schedule Record-keeping log Plan for evaluation and revision In-service training

Who can perform annutal tests for dental x-ray machines?

Dentist Dental Hygienist Dental Assistant Manufacturer's service representative

What should cassettes be checked for?

Every month for worn closures, light leaks, and warping Adequate screen to film contact

Calibartion of dental x-ray equipment can be performed by a dentist, dental hygienist, or dental assistant. True or False

False, it must be done by a technician

What is the coin test and what does it check?

It checks the safelight. A coin is placed on an unwrapped film and the safelight is turned on from about 3-4 minutes. Then, the film is processed. If there is a visible image the safelight is not safe to use

What is the most critical component of film processing quality control?

Monitoring of the processing solutions

How often should screens be cleaned?

Monthly basis After cleaning the screen, an antistatic solution should be applied to it

Test to monitor fixer strength

Place an unwrapped film into fixer solution and measure the amount of time it takes for it to clear. If it takes 2 minutes, it is good. If it does not clear within 3-4 minutes the fixer is depleted.

What does a quality assurance plan include?

Quality control tests and quality administration procedures

How often should the processing solutions be replenished and how often should they be changed?

Replenished: daily Changed: Every 3-4 weeks

What is quality assurance?

Special procedures that are used to assure the production of high-quality diagnositic radiographs

What are quality control tests?

Specific tests taht are used to maintain and monitor dental x-ray equpiment, supplies, and film processing.

Annual tests for dental x-ray machines can be performed by a dentist, dental hygienist, or dental assistant. True or False

True

For quality control purposes, each new box of unopened film should be tested for film freshhness and fogging before it is used. True or False

True

Fresh films and fresh chemicals must be used when preparing reference radiographs True or false

True

When functioning properly, a viewbox should emit a uniform and brilliant light True or False

True

What is the test for film processing equpiment?

Unwrap 2 unexposed films and expose one to light. Process these films. One should come out clear and dry and the other should come out black and dry.

Reference Radiograph

Use fresh film and the correct exposure factors to make a reference radiograph. Chemicals must be at the recommended time and temperature. Compare this with radiographs taken daily.

What is a reference radiograph used to test?

Stregth of developer solution

Regardless of who actually exposes and processes the radiographs, the dentist is ultimately responsible for the diagnostic quality of all dental radiographs. True or False

TRUE

Who is responsible for overal quality assurance

The dentist

hat is quality administration

The management of the quality assurance plan in the dental office

The densities seen on the daily radiograph appear lighter than the densities seen on the reference radiograph. This result indicates that ___. a)The developer solution is too weark b)the developer solution is too concentrated c)the developer solution is too cold d)either a or c e)either b or c

d) either a or c

One the average, prcessing solutions should be replenished... (how often)

daily

The darkroom must be checked for light-tightness every how many months?

every month

The clearing test is used to monitor..

fixer strength

Normalizing device

monitors developer strength and film density

One of the most critical areas of quality control that requires daily monitoring is __. a)examination of the fluorescent bulbs inside the viewbox b)cleaning the extraoral intensifying screens c)examination of the darkroom for light-tightness d)processing of films e)all of the above

processing of films

What is the fresh film test and what do the results look like?

used to check a newly opened box of film. Process an unexposed film from a newly opened box. If the film is fresh it will appear to be clear with a slight blue tint. If the film is fogged it is expired, improperly stored, or exposed to radiation