Term
| quality is associated with what? |
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Definition
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Term
| quantity is associated with what? |
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Definition
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Term
true or false
intensity talks about both kvp and mA |
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Definition
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Term
| does a short or long wavelength have more power? |
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Definition
| shorter has more penetrating power. |
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Term
| what type of waves use long wavelengths? |
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Definition
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Term
| what is wavelength determined by? |
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Definition
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Term
| short wavelength produces what frequency? |
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Definition
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Term
| long wavelength puts out what frequency |
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Definition
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Term
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Definition
measure of force that refers to potential difference between cathode and anode.
it is the force that causes electrons to move from cathode to anode |
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Term
| what happens to speed of electrons if voltage is increased? |
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Definition
| electron speed is increased |
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Term
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Definition
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Term
| how do most dental offices measure force? |
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Definition
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Term
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Definition
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Term
| what is the range used in dental radiography? |
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Definition
65,000-100,000 volts
or
65-100 kVp |
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Term
| if one is using 85-100kvp what are we trying to accomplish? |
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Definition
| getting thicker denser areas with a shorter wavelength to get greater penetration |
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Term
| when would we use 65-75 kVp? |
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Definition
| on children or less dense areas |
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Term
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Definition
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Term
| if you increase kvp what will happen to penetrating power? |
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Definition
| penetrating power would increase |
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Term
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Definition
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Term
| if kvp is decreased what happens to density? |
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Definition
| density decreases as well apearing lighter |
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Term
| if you increase kVp what happens to density? |
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Definition
| density will increase /appear darker |
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Term
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Definition
| how sharply dark and light areas are differentiated or separated on film. |
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Term
-few shades of gray
-high contrast
-helps to diagnose caries
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Definition
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Term
-low contrast
-many shades of gray
-diagnosis of periapical absesses and periodontal disease |
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Definition
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Term
| when talking about exposure and time how are they measured? |
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Definition
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Term
| how often does 1 impulse occur? |
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Definition
| 1/60th of a second which means there are 60 implulses in 1 second. |
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Term
| if kVp is decreased what must we do with time? |
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Definition
| increase time to keep same density |
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Term
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Definition
| the number of x-rays produced |
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Term
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Definition
| determines the amount of electrons passing through the cathode filament |
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Term
| what is a milliampere equal to? |
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Definition
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Term
| what happens when to x-ray when you increase electrons? |
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Definition
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Term
| what is the dental radiography requirement for mA |
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Definition
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Term
| how are mA and temperature related? |
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Definition
| mA regulates the tempurature if mA is increased, then temp is increased producing more electrons |
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Term
| what should you about time if mA is increased |
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Definition
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Term
| what is the common factor of mA and time what is it called? |
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Definition
milliampere seconds
how many and how long |
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Term
| what happens to density if you increase mA? |
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Definition
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Term
| what happens to density if you decrease mA? |
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Definition
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Term
| what happens to image if mA is too high and time is too long? |
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Definition
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Term
| 10 mA x 1.5 seconds =15 mA |
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Definition
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Term
| what kind of relationship do mA and time have? |
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Definition
inverse relationship
meaning if you increase time you decrease mA and vice versa |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| when you describe quality and quantity together. |
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Term
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Definition
| the product of the quantity (# of x-rays/mA) and the quality of ( energy pg each photon/kVp) per unit of earea per unit of time exposure. |
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Term
(# of photons) x (energy of photons)
____________________________
(area) x (exposure time) |
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Definition
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Term
| what are the 4 factors of intensity |
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Definition
-kvp
-mA
-exposure time
-distance |
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Term
| what happens to intensity if you increase kVp? |
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Definition
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Term
| what happens to intensity if you increase ma? |
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Definition
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Term
| what happens to exposure time if kVp is increased by 15? |
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Definition
| decrease exposure time by 1/2 |
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Term
| what happens to exposure time if kVp is decreased by 15? |
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Definition
increase exposure time by 2
(ie)
a diagnostic image is produced using 90 kVp and .025 second. what exposure time is needed to produce the same image at 75 kVp?
increase exposure time by 2
so, 0.25x2= 0.50 |
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Term
| a diagnostic image is produced using 10 mA and 0.45 second. what exposure time is needed to produce the same image at 15 mA? |
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Definition
10x0.45=4.5
so what times 15 will equal 4.5
15x0.30=4.5 |
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Term
| what do aluminum filters do? |
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Definition
-reduce intensity
-lower energy
-less penetration
-longer wavelength |
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Term
| how thick are aluminum disks? |
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Definition
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Term
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Definition
| half value layer, it is the thickness of aluminum that reduces intensity by half. |
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Term
| distance has 3 targets what are they? |
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Definition
-target to surface distance (tissue)
-target to object distance (tooth)
-target to receptor distance (film) |
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Term
| is a short PID more intense or less intense |
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Definition
| -more intense due to short distance to receptor |
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Term
| what is inverse square law |
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Definition
radiation of long PID 16" is 1/4 the radiation of short 8" PID
and radiation of short is 4x that of long PID |
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Term
| would a short PID need more or less time? |
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Definition
| -less time because radiation is 4x stronger |
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Term
| would a long PID need more or less time? |
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Definition
| -more time because radiation is only 1/4 of the short PID. |
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