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Radt. 3000 > Exam 5 > Flashcards

Exam 5 Flashcards

1
Q

mAs increases-

A

receptor exposure

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2
Q

mAs-

A

total exposure

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3
Q

kVp-

A

penetrating ability of the beam

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4
Q

kVp increases-

A

receptor exposure

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5
Q

kVp decreases-

A

contrast

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6
Q

kVp increases, the scale of contrast-

A

gets longer

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7
Q

kVp decreases, the scale of contrast-

A

gets shorter

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8
Q

kVp only affects-

A

visibility properties

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9
Q

motion caused by (2)-

A

voluntary & involuntary motion

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10
Q

voluntary motion-

A

breathing

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11
Q

involuntary motion-

A

heartbeat/peristalsis

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12
Q

motion increases-

A

-unsharpness
-penumbra/blur
-contrast only where motion occurs on img.

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13
Q

Motion decreases-

A

-spatial resolution
-image sharpness

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14
Q

focal spot size is confined ONLY to-

A

spatial resolution

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15
Q

focal spot size decreases-

A

spatial resolution

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16
Q

focal spot size increases

A

Unsharpness

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17
Q

SID increases-

A

spatial resolution

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18
Q

SID increases, spatial resolution increases, which results in-

A

less magnification (size distortion)

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19
Q

SID decreases-

A

-receptor exposure
-distortion
-intensity

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20
Q

OID increases-

A

-contrast
-size distortion
-magnification

21
Q

OID decreases-

A

-spatial resolution
-receptor exposure

22
Q

2 types of tube filtration-

A

inherent & added

23
Q

added filtration-

A

intentionally added to image, can add compensating filter

24
Q

added filtration filters (3)-

A

boomerang, wedge, & trough

25
Q

wedge filter-

A

balances exposure, small on one end & large on other

26
Q

tube filter/filtration increases-

A

contrast

27
Q

tube filter/filtration decreases-

A

receptor exposure (the thicker the filter, the less exposure bec it absorbs x-ray beam)

28
Q

beam restriction purpose-

A

decrease pt. exposure & dose & increase contrast

29
Q

beam restriction/collimation increases-

A

contrast

30
Q

beam restriction/collimation decreases-

A

-receptor exposure
-scatter
-quantity

31
Q

beam restriction/collimation affects-

A

production of scatter

32
Q

mA-

A

quantity being forced across x-ray tube

33
Q

grids-

A

absorbs scatter before it reaches IR

34
Q

Grid ratio increases-

A

-contrast
-mAs

35
Q

Grid ratio decreases-

A

receptor exposure

36
Q

when using a grid, you would increase mAs to-

A

maintain receptor exposure

37
Q

when scatter increases, you get ______ contrast-

A

long scale of contrast

38
Q

grids have no affect on-

A

-spatial resolution
-distortion

39
Q

anode heel affect-

A

variation of intensity along longitudinal axis of IR

40
Q

in anode heel affect, intensity increases toward _____ & decreases toward ______-

A

increases toward cathode & decreases toward anode

41
Q

exams that utilize anode heel affect-

A

any exam w: short SID & large field size or coll. opened up to 14x17

42
Q

elongation-

A

part & IR parallel to each other, but tube is angled

43
Q

foreshortening-

A

x-ray tube perp. to IR, but part not parallel to IR

44
Q

tube angle increases-

A

shape distortion

45
Q

tube angle decreases-

A

-spatial resolution
-receptor exposure

46
Q

patient factors-

A

-pt. size
-pathology
-casts

47
Q

pt. factors increases-

A

magnification/distortion

48
Q

pt. factors decreases-

A

-receptor exposure
-contrast
-spatial resolution

Radt. 3000 (6 decks)

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