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FILM SCREEN IMAGE ACQUISITION, PROCESSING AND IMAGE ANALYSIS > Detail > Flashcards

Detail Flashcards

1
Q

refers to how well one can see small structures in the radiograph

A

definition

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2
Q

OR the smallest object that can be detected in an image

A

definition

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3
Q

sharpness of the structural edges of the image on the radiograph

A

definition

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4
Q

clarity of the sharpness of the structural lines of the anatomic parts

A

definition

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5
Q

detail sharpness
abruptness of borders
clarity
image resolution
spatial resolution (digital imaging)

A

definition

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6
Q

definition can be measured with __________ ____ pattern and expressed in lp/mm

A

definition can be measured with RESOLUTION TEST pattern and expressed in lp/mm

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7
Q

↑ lp/mm = _ blur = _ recorded detail

A

↑ lp/mm = ↓ blur = ↑ recorded detail

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8
Q

resolution test tools

A

star pattern
parallel line type

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9
Q

focal spot size evaluation

A

star pattern

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10
Q

intensifying screen evaluation

A

parallel line type

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11
Q

sharpness with which anatomical structures are displayed on an image receptor

A

recorded detail

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12
Q

how well the recorded detail can be seen

A

visibility of detail

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13
Q

true image

A

umbra

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14
Q

geometric unsharpness; the blurred areas around the umbra

A

penumbra

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15
Q

inversely related to recorded detail

A

magnification

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16
Q

↑ magnification = _ recorded detail

A

↑ magnification = ↓ recorded detail

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17
Q

controls image blur

A

focal spot size

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18
Q

occurs because the focal spot is not a point source

A

focal spot blur

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19
Q

is the most important factor in determining spatial resolution

A

focal spot blur

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20
Q

focal spot blur is _______ on the anode side and _______ on the cathode side

A

focal spot blur is SMALL on the anode side and LARGE on the cathode side

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21
Q

the smaller the focal spot the _______ the image

A

the smaller the focal spot the SHARPER the image

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22
Q

is determined by the size of filament, thus when one chooses the size of the focal spot, he/she is actually choosing the size of the filament

A

focal spot size

23
Q

0.5mm to 0.6mm

A

small focal spot

24
Q

1mm to 1.2mm

A

large focal spot

25
Q

in choosing a small focal spot, heat will be concentrated to a small area and cause the filament to _____

A

in choosing a small focal spot, heat will be concentrated to a small area and cause the filament to BUST

26
Q

the closer the object to the image receptor the ______ the image

A

the closer the object to the image receptor the SHARPER the image

27
Q

the longer the SID, the _______the image

A

the longer the SID, the SHARPER the image

28
Q

the use of Intensifying screen results to _____ detail image

A

the use of Intensifying screen results to POOR detail image

29
Q

when very long exposure time is used there is a greater probability that motion will be caught on the radiograph

A

time

30
Q

results when the patient moves during exposure

A

movement of patient

31
Q

motion when caught on the radiograph results to visible blurring of the image called motion _____________

A

motion when caught on the radiograph results to visible blurring of the image called motion UNSHARPNESS

32
Q

usually happens when there is malfunction in the Bucky tray that it moves with the movement of grid during exposure

A

movement of image receptor

33
Q

distance from the anatomical part being imaged to the image receptor

A

OID

34
Q

↓ OID = _ magnification = _ image blur = ↑ recorded detail
↑ OID = _ magnification = _ image blur = ↓ recorded detail

A

↓ OID = ↓ magnification = ↓ image blur = ↑ recorded detail
↑ OID = ↑ magnification = ↑ image blur = ↓ recorded detail

35
Q

distance from the source of radiation (usually anode in the xray tube) to the image receptor

A

SID

36
Q

↑ SID = _ magnification = _ image blur = ↑ recorded detail
↓ SID = _ magnification = _ image blur = ↓ recorded detail

A

↑ SID = ↓ magnification = ↓ image blur = ↑ recorded detail
↓ SID = ↑ magnification = ↑ image blur = ↓ recorded detail

37
Q

↑ focal spot size = _ unsharpness

A

↑ focal spot size = ↑ unsharpness

38
Q

effective or projected focal spot size is always smaller than the actual focal spot

A

line focus principle

39
Q

use of small focal spot = ↑ recorded detail = _ heat at the anode

A

use of small focal spot = ↑ recorded detail = ↑ heat at the anode

40
Q

↓ FSS = ↓ area of x-ray production = ↓ image blur = _ recorded detail

A

↓ FSS = ↓ area of x-ray production = ↓ image blur = ↑ recorded detail

41
Q

↑ FSS = ↑ area of x-ray production = ↑ image blur = _ recorded detail

A

↑ FSS = ↑ area of x-ray production = ↑ image blur = ↓ recorded detail

42
Q

↑ motion = ↑ blur = _ recorded detail

A

↑ motion = ↑ blur = ↓ recorded detail

43
Q

is the greatest adversary of recorded detail

A

motion

44
Q

voluntary patient motion = _ by good communication

A

voluntary patient motion = ↓ by good communication

45
Q

involuntary patient motion = _ by using the shortest possible exposure time

A

involuntary patient motion = ↓ by using the shortest possible exposure time

46
Q

↑ IS speed = ↓ patient dose = _ tube life

A

↑ IS speed = ↓ patient dose = ↑ tube life

47
Q

absorb x-ray photons → emit a large quantity of fluorescent light

A

intensifying screens

48
Q

____________ light is responsible for >98% of film emulsion exposure

A

FLUORESCENT light is responsible for >98% of film emulsion exposure

49
Q

the color light emitted by the phosphors must be correctly matched with the film emulsion sensitivity

A

spectral matching

50
Q

Rare Earth Phosphors = _ conversion efficiency

Calcium Tungstate Phosphors = _ conversion efficiency

A

Rare Earth Phosphors = ↑ conversion efficiency

Calcium Tungstate Phosphors = ↓ conversion efficiency

51
Q

phosphor fluorescence after the x-ray source has terminated

A

lag or afterglow

52
Q

associated with fluoroscopic screens

A

Phosphorescence

53
Q

required to maintain recorded detail

A

perfect screen film contact

54
Q

is the number of pixels that make up the image

A

matrix size

FILM SCREEN IMAGE ACQUISITION, PROCESSING AND IMAGE ANALYSIS (12 decks)

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