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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
in choosing a small focal spot, heat will be concentrated to a small area and cause the filament to _____
in choosing a small focal spot, heat will be concentrated to a small area and cause the filament to BUST
26
the closer the object to the image receptor the ______ the image
the closer the object to the image receptor the SHARPER the image
27
the longer the SID, the _______the image
the longer the SID, the SHARPER the image
28
the use of Intensifying screen results to _____ detail image
the use of Intensifying screen results to POOR detail image
29
when very long exposure time is used there is a greater probability that motion will be caught on the radiograph
time
30
results when the patient moves during exposure
movement of patient
31
motion when caught on the radiograph results to visible blurring of the image called motion _____________
motion when caught on the radiograph results to visible blurring of the image called motion UNSHARPNESS
32
usually happens when there is malfunction in the Bucky tray that it moves with the movement of grid during exposure
movement of image receptor
33
distance from the anatomical part being imaged to the image receptor
OID
34
↓ OID = _ magnification = _ image blur = ↑ recorded detail ↑ OID = _ magnification = _ image blur = ↓ recorded detail
↓ OID = ↓ magnification = ↓ image blur = ↑ recorded detail ↑ OID = ↑ magnification = ↑ image blur = ↓ recorded detail
35
distance from the source of radiation (usually anode in the xray tube) to the image receptor
SID
36
↑ SID = _ magnification = _ image blur = ↑ recorded detail ↓ SID = _ magnification = _ image blur = ↓ recorded detail
↑ SID = ↓ magnification = ↓ image blur = ↑ recorded detail ↓ SID = ↑ magnification = ↑ image blur = ↓ recorded detail
37
↑ focal spot size = _ unsharpness
↑ focal spot size = ↑ unsharpness
38
effective or projected focal spot size is always smaller than the actual focal spot
line focus principle
39
use of small focal spot = ↑ recorded detail = _ heat at the anode
use of small focal spot = ↑ recorded detail = ↑ heat at the anode
40
↓ FSS = ↓ area of x-ray production = ↓ image blur = _ recorded detail
↓ FSS = ↓ area of x-ray production = ↓ image blur = ↑ recorded detail
41
↑ FSS = ↑ area of x-ray production = ↑ image blur = _ recorded detail
↑ FSS = ↑ area of x-ray production = ↑ image blur = ↓ recorded detail
42
↑ motion = ↑ blur = _ recorded detail
↑ motion = ↑ blur = ↓ recorded detail
43
is the greatest adversary of recorded detail
motion
44
voluntary patient motion = _ by good communication
voluntary patient motion = ↓ by good communication
45
involuntary patient motion = _ by using the shortest possible exposure time
involuntary patient motion = ↓ by using the shortest possible exposure time
46
↑ IS speed = ↓ patient dose = _ tube life
↑ IS speed = ↓ patient dose = ↑ tube life
47
absorb x-ray photons → emit a large quantity of fluorescent light
intensifying screens
48
____________ light is responsible for >98% of film emulsion exposure
FLUORESCENT light is responsible for >98% of film emulsion exposure
49
the color light emitted by the phosphors must be correctly matched with the film emulsion sensitivity
spectral matching
50
Rare Earth Phosphors = _ conversion efficiency Calcium Tungstate Phosphors = _ conversion efficiency
Rare Earth Phosphors = ↑ conversion efficiency Calcium Tungstate Phosphors = ↓ conversion efficiency
51
phosphor fluorescence after the x-ray source has terminated
lag or afterglow
52
associated with fluoroscopic screens
Phosphorescence
53
required to maintain recorded detail
perfect screen film contact
54
is the number of pixels that make up the image
matrix size

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

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