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Test your basic knowledge |
Radiology
Start Test
Study First
Subjects
:
health-sciences
,
radiology
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The smaller the focal spot
short scale of contrast
the sharper the radiograph
screens (phosphor layer)
no contrast
2. If there's bone in the way of an x-ray -. those parts would be
visible light
density
10 cm
whiter
3. These screens are the most common type - they give good resolution with relatively low exposure
medium or par
increase scatter
genetic and somatic
double contrast
4. If the thorax is greater than or equal to....you should use a grid
false
14 x 17
grid cutoff
15 cm
5. A...is a series of lead strips on edge which only allow the primary x-rays - which are traveling in straight lines - reach the film
grid
0.5mm
double contrast
collimator
6. Screen speed is.....to the exposure required to cause it to flouresce
anode
inversely proportional
true
grid efficiency
7. When the density difference is great - there is
fixer
false
high contrast
paresis
8. Extra vertebrae - scoliosis - fused vertebrae are all examples of
abnormalities
increase scatter
40
2
9. With the heel effect - more x-rays tend to be produced toward the cathode end
thoracic(caudal) and lumbar
true
rare earth elements
pneumocystogram
10. Another result of the 20 degree angling
indirect relationship
non-screen
double contrast
heel effect
11. Must change if the FFD changes
inversely proportional
collimator
screen film
mAs
12. The effective focal spot is approximately 1/3 the size of the actual focal spot
intussusception
true
phosphor layer
false
13. As this increases - the intensity of the x-ray beam decreases - so the beam intensity increases - and the mAs must decrease to compensate
fast film
kVp
rapidly dividing
FFD
14. Incorrect grid focus is one reason for
false
more x-rays produced
grid cutoff
cassette
15. Screens are classified according to
speed
long scale of contrast
0.5mm
non-screen
16. A device that moves the grid back and forth under the table. it helps to prevent grid lines from showing
density
potter-bucky diagram
intensifying screens
grid focus
17. Between density and mAs
fast film
0.5mm
high contrast
direct relationship
18. The distance from the x-ray tube to the x-ray machine is the SID (source image distance) - or the FFD (also known as....)
focal film distance
grey
genetic and somatic
calcium tungstate
19. Loss of movement in legs (front and/or back)
paralysis
scatter radiation
non-screen
x-rays
20. Film with: ultra speed - grainier image - less exposure needed
true
indirect relationship
fast film
effective focal spot
21. Compound of silver and bromine - chlorine - or iodine - all of which are in the halogen group of elements
unexposed AgBr
15 cm
silver halide
luxations
22. If the grid is stationary - more lines that are finer are less apt to show up on a radiograph - this is called....
focal film distance
lines per centimeter
screens (phosphor layer)
6 ft
23. If there's no object in the way of an x-ray - the picture would be
black
screens (phosphor layer)
SOP
true
24. Hairloss or baldness
1/30
alopecia
2.5
narrow latitude film
25. Faster screens/less detail; slower screens/more detail
large crystals - small crystals
line focus principle
1/30
inversely proportional
26. Types of grids
grey
focused and unfocused or parallel
anode
increase scatter
27. Is the device which restricts (narrows) the beam of x-rays as they leave the x-ray machine
the sharper the radiograph
collimator
decrease scatter radiation
afterglow
28. These crystals will turn white/clear when processing film
arthritis
secondary
unexposed AgBr
focal spot
29. Lead equivalent for thyroid sheild
0.5mm
thoracic(caudal) and lumbar
true
14 x 17
30. What gives off 4 times the amount of light photons than does the calcium tungstate (it gives off green light)
rare earth elements
silver halide
nucleus pulposis
screen film
31. What type of films need a lot more x-ray exposure and more time to expose them
scatter radiation
non-screen
x-rays
cathode
32. This number in santes' rule refers to the distance the x-ray tube is from the x-ray film
40
hypaque
increase scatter
fixer
33. Redness of the skin
erythema
15
2
increase density
34. Has a filament made of tungsten - due to the high melting point
rapidly dividing
afterglow
intussusception
cathode and anode
35. Calcium 'bridges' between adjacent vertebrae
paresis
x-rays
annulus fibrosis
spondylosis
36. If the kVp is too high
increase scatter
medium or par
15 cm
movement
37. AgBr + light =
speed
electrons
fluoroscopy
screen film
38. What type of cystogram uses air and hypaque
direct relationship
true
double contrast
false
39. Is determined by the ratio of the height of the lead strips to the distance between them
grid efficiency
10 cm
medium film
true
40. When processing film - the black areas are made of
non-screen
fast
metallic silver
joint mouse
41. Body cells affected - damage seen during lifetime of creature - can be immediate or cummulative
stops peristalsis
non-screen film
somatic damage
heel effect
42. Monitors personal exposure to radiation
dosimeter
indirect relationship
narrow latitude film
fogging
43. Amount of radiation a person can recieve in a calendar year
false
cervical
Maximum Permissible Dose
stationary anode
44. The layer of the film where the action occurs
AgBr
mAs
santes' rule
mAs
45. Old mAs x (new FFD)2 divided by (old FFD)2
paresis
non-screen film
inverse square law
the sharper the radiograph
46. Can cause damage to living cells through the process of excitation or ionization of electrons in the orbits around atoms
grid cutoff
hyperesthesia
x-rays
adjustable lead shutters
47. General purpose film - forgiving
wide latitude film
false
density
afterglow
48. Slowly growing dividing cells are the most sensitive to the effects of ionizing radiaton
false
2
mAs
non-screen
49. We should always try and stay How many feet from our x-ray machine
medium or par
6 ft
secondary
visible light
50. AgBr + x-rays =
reflective layer
15
more light
non-screen film