DHYG Radiology Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Question | Answer |
The energy of photons produced in an x-ray machine is dependent upon? | KVP |
The speed at which electrons move across an x-ray tube is regulated by? | Kilovoltage |
Changing from 75kVp to 90kVp will? | decrease x-ray density |
What allows for greater penetration of x-rays? | increased kVp |
What describes radiographic film that has many gradation of gray from totally white to black? | low contrast or many shades of gray |
Both milliampere setting and exposure time determine what? | the number of x-rays produced |
A radiograph is taken with an exposure time of 30 impulses, what is the exposure time in seconds? 60 impulses= 1 sec | 1/2 second |
What is the principal factor that controls x-ray penetration? | Wavelength |
According to the inverse square law, if distance is doubled what happens to the exposure time? | X 4 |
What happens to the intensity when you switch from an 8" to a 16" cone? | decreases by 4 |
Radiation film fog may be caused by | secondary radiation |
What is the direct effect of radiation when a photon contacts outer orbital electrons called? | Thomson scattering |
What is the transfer of all energy; ionization of inner electron? | Direct effect: Photoelectric |
What is the transfer of partial energy; ionization of outer shell electron and the production of scatter radiation. | Direct effect: Compton effect |
Name the most sensitive tissue to the least sensitive to radiation? | Reproductive, lymphatic, young bone, circulatory, endocrine respiratory, digestive mature bone, nervous |
What is the maximum permissible dose for occupational exposure | 5 rem/year .05 Sv or 50 mSv |
What thickness is required for the patient's lead apron? | .25 mm |
Regarding film speed, what is the rule for exposure time and film speed D-E? | decrease exposure time by 1/2 |
Regarding film speed, what is the rule for exposure time and film speed E-F? | decrease exposure time by 20% |
What is the purpose of the collimator/lead diaphragm? | to limit the size and shape of the beam to 2.75 |
What PID reduces scatter rays? | Long cone/rectangular |
What is the purpose of filtering an x-ray beam? | remove low energy photons |
Which projection is required to aid localization of an impacted maxillary premolar after periapical radiographs? | Maxillary occlusal projection |
What is the purpose of using intensifying screens? | reduction of exposure time |
If the temperature of processing solutions is slightly above normal, radiographs of desired density may be best obtained by? | decreasing developing time |
In developing radiographs, what does the fixer do? | remove unexposed silver halide and shrink and harden the emulsion |
what is the major difference between automatic and manual processing of radiographs? | Auto requires special solutions at higher temps |
Name the technical error with too much vertical angulation. | Foreshortening |
Name the technical error for incorrect cone or film placement | cone cut |
What is the effect on a radiograph if the film is placed backwards? | herringbone |
If you fail to completely submerse film in the developer what processing error would you have? | clear area |
If you fail to completely submerse your film in the fixer what processing error occurs | a black streak |
Scatter radiation, improper safe light and light leak all cause what processing error? | Film fog |
Created by:
aheflin
Popular Dentistry sets