Term
|
Definition
| the penetrating ability of an Xray beam |
|
|
Term
| What is quality controlled by? |
|
Definition
|
|
Term
| What does wavelength determine? |
|
Definition
| the energy and penetrating ability of the xray beam |
|
|
Term
| Do xrays with shorter wavelengths have more or less penetrating power? |
|
Definition
|
|
Term
|
Definition
force that drives an electrical current through the circuit
-effects how fast electrons travel from cathode to anode |
|
|
Term
| What happens to the speed of electrons when voltage is increased? |
|
Definition
| speed of electrons increases |
|
|
Term
| How many volts does a kilovole equal? |
|
Definition
|
|
Term
| How many kv does a dental radiography require? |
|
Definition
|
|
Term
| What happens if kv is under 65? Over 100? |
|
Definition
| inadequate penetration, over penetration |
|
|
Term
|
Definition
| peak voltage of alternating current |
|
|
Term
| What is an alternating current? |
|
Definition
| current that flows both directions |
|
|
Term
| What is quality controlled by? |
|
Definition
|
|
Term
| What does kVp regulate? What does it determine? |
|
Definition
| the speed of electrons, the penetrating ability of xray beam |
|
|
Term
| How does kVp affect density? |
|
Definition
increase kVp=darker density
decrease kVp=lighter |
|
|
Term
|
Definition
varying shades of grey-
high contrast=just whites and blacks
low contrast=many shades of grey |
|
|
Term
| How does kVp effect contrast? |
|
Definition
High kVp=low contrast
Low kVp=high contrast |
|
|
Term
| What are high contrast radiographs used for? |
|
Definition
|
|
Term
| What are low contrast radiographs used for? |
|
Definition
| Detection of periodontal or periapical disease |
|
|
Term
| What is considered low and high kvp? |
|
Definition
|
|
Term
| If you have a high kvp what will the density and contrast be like? |
|
Definition
| high density, low contrast |
|
|
Term
| If you have a low kvp what will the density and contrast be like? |
|
Definition
| low density, high contrast |
|
|
Term
| How is exposure time of radiographs measured? |
|
Definition
|
|
Term
| How many impulses are in a second? |
|
Definition
|
|
Term
| what is something you must change if you change kpv? |
|
Definition
|
|
Term
| If you increase kvo then what should you do to exposure time? |
|
Definition
|
|
Term
| if kvp is increased by 15 then what should you do with your exposure time? |
|
Definition
|
|
Term
| If kvp is decreases by 15 then what should you do with your exposure time? |
|
Definition
|
|
Term
|
Definition
| number of xrays produced in the dental xray unit |
|
|
Term
|
Definition
| Determines number of electrons passing from cathode to anode |
|
|
Term
| What is quantity controlled by? |
|
Definition
|
|
Term
|
Definition
1 amp=1000 mA *or*
1/1000 amp= 1 mA |
|
|
Term
| What is the mA range of dental radiography? |
|
Definition
|
|
Term
| What will anything higher than 15 mA cause? |
|
Definition
|
|
Term
|
Definition
| the temp of the tungstan filament the cathode |
|
|
Term
| what are three things a increase in mA causes? |
|
Definition
1.Increases number of electrons produced in cathode
2.Increases number electrons to strike anode
3.Increases number of xrays emitted from the tube |
|
|
Term
| How does mA effect density? |
|
Definition
| increase mA results in a increase in density |
|
|
Term
| What are two things that regulate the number of xrays being produced? |
|
Definition
|
|
Term
| What is the formula for mA and exposure time? |
|
Definition
|
|
Term
| What determines the intensity of the xray beam? |
|
Definition
| quantity and quality of xray photons |
|
|
Term
| What are four components that contribute to intensity? |
|
Definition
1.mA
2.kVp
3.Distance
4.impulses |
|
|
Term
| What is the equation used to determine intesity? |
|
Definition
| intensity= (mAxkVp)/(distanceximpulse) |
|
|
Term
|
Definition
regulates the penetrating power of the xray beam by controlling speed of electrons traveling between the anode and cathode
-effect quality |
|
|
Term
|
Definition
controls the penetrating power of the xray beam by controlling the number of electrons produced in the xray tube and the number of xrays produced
-mA effectss quantity |
|
|
Term
| What does increasing exposure time do? |
|
Definition
| increases number xrays, increases intensity, increases density |
|
|
Term
| How does distance effect the penetrating power of electrons? |
|
Definition
| the greater the distance the less the penetrating power |
|
|
Term
| What is the inverse square law measuring? |
|
Definition
| intensity's relationship to distance |
|
|
Term
| What is the inverse square law? |
|
Definition
|
|
Term
| Where are aluminum filters found? |
|
Definition
| placed in path of the beam inside of the dental xray tubehead |
|
|
Term
| What do aluminum filter do? |
|
Definition
| help us filter out low energy, longer, less penetrating energy waves |
|
|
Term
| What is the half value layer? |
|
Definition
| the thickness of aluminum that reduces the intensity of the xray beam by halk |
|
|
