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ch 15 Flashcards

1
Q

IP

A

Imaging plate

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2
Q

PD

A

photodiode

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3
Q

PMT

A

photomultiplier tube

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4
Q

PSL

A

photostimulable luminescence

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5
Q

SP

A

storage phospher

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6
Q

SPS

A

storage phosphor screen

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7
Q

CR

A

computer radiography

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8
Q

DR

A

direct/indirect digital radiography

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9
Q

Each cassette contains a ______ image

A

latent

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10
Q

Each can be used ______ with the imaging system

A

interchangeably

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11
Q

When CR is exposed to xrays it emits some light _____

A

immediately

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12
Q

While screen film imaging uses fluorescence, CR uses _____

A

photostimulable luminescence

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13
Q

Emission of visible light after excitation by laser light is called

A

photostimulation

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14
Q

Photostimulable material emits some light during _____, but emits some light later when excited by _______

A

stimulation ,a laser

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15
Q

A common phosphor for CR is barium fluorohalide with ____

A

europium

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16
Q

europium is the ____ and is responsible for the _____ of this phosphor

A

activator, storage properties

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17
Q

Europium is only present in ____ amounts

A

small

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18
Q

When storage phosphor screen is exposed to xrays many atoms are sent into an ____

A

excited state

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19
Q

Outer shell electron moves into a _____ state

A

metastable

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20
Q

When electrons return to their normal state ____ is emitted

A

visible light

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21
Q

Storage phosphor screen is similar to

A

intensifying screen

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22
Q

What are the layers of storage phosphor

A

base, protective layer, reflective layer

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23
Q

PSP crystals are arranged in

A

a binder (needle like fashion)

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24
Q

SPS is stored inside of

A

imaging plate

25
Imaging plate is a cassette with a _____ backing
lead
26
When PSP is exposed to xray many electrons are excited into a ____ state
metabolic
27
What % of electrons return to normal state immediately after emitting light
50%
28
Remaining % return to normal state over time or when stimulated by a ___
laser
29
Laser beam causes electrons that are metastable state to ____
return to normal state
30
When electrons return to their normal state ____
visible light is released
31
Light released is a _____ wavelength than the laser beam
shorter
32
Laser beam is at ____ mm
50-100
33
Diameter of laser beam affects ____ of the CR
spatial resolution
34
The ___ the diameter of the laser beam the better the spatial resolution.
smaller
35
The ___ intensity of the laser, the ____ intensity of the emitted light
greater, greater
36
A _____ collects the blue light emitted from storage phosphor screen
photodiode
37
Solid state device that converts light into electric current
photodiode
38
The ____ is read to form the image
electric current
39
If any residual image is left on the plate it can cause ____
artifacts
40
White light is used to flood SPS and return ______ to their normal state
remaining electrons
41
Storage phosphor screens are sensitive to _____ and can become ______
background radiation, fogged
42
_____ moves the IP slowly along the long axis of the IP
drive mechanism
43
Drive mechanism moves at a _____ speed so IP is read consistently
constant
44
As a slow scan is happening a ____ moves the laser beam back and forth.
mirror
45
Any deviation of slow or fast scan causes ____
artifacts
46
Optical features include
laser, beam shaping optics, light collecting optical filter, and photodetector
47
Beam shaping objects keeps the beam at a consistent
size, shape, speed, intensity
48
Light emitted from IP is channeled into a ___ collection
fiber optic
49
The photodectector, PMT, PD, or CCD converts light signal to ____
electric current
50
The computer performs ___ to _____ through sampling and quantization
analog to digital conversion (ADC)
51
____ is the time between samples
sampling
52
____ is the value of each sample
quantization
53
The ____ is where the image temporarily stored
image buffer
54
CR doesn't have a _____ but has an image receptor response function
characteristic curve
55
CR has a wider ____ than screen film
Latitude
56
Screen film can display ___ shades of gray
30
57
CR can display ____ gray levels through ____ processing
10,000 , post
58
At lower exposures CR is faster than a ____ speed film screen combination
400
59
Because of wider exposure latitude, ____ repeat exams are required
fewer

Physics (10 decks)

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