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Summer 2022 > Susanoo > Flashcards

Susanoo Flashcards

1
Q

Glass envelope

A

Actual tube that conatins vacuum to allow electrons to flow without colliding with gas atoms

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2
Q

Window

A

Part of glass envelope where xrays passs through on their way down to patient
Made out of thinner glass

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3
Q

Tube Housing(Lead Casing)

A

Contains oil, aids in electrical insulation, keeps tube cool

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4
Q

Cathode

A

Negative terminal, contains focusing cup with negative charge around filament

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5
Q

Anode

A

Made of tungsten, attachted to rotor, rotates disk

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6
Q

Exposure button

A

Filament heats up and releases electron
Anode rotates from 3000-20000 rpm
positive charge is applied to rotating anode
Positive charge pulls electrons, electrons strike anode, xrays are produced

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7
Q

Collimator

A

Limits xray field reigon of interest

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8
Q

Xrays cannot be:

A

Seen
Smelled
Felt
Heard

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9
Q

xrays travel:

A

At speed of light

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10
Q

Grid

A

Between patient and IR, absorbs scatter xrays

Primary beam allowed to pass through grid

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11
Q

Detent

A

Mechanism that tends to stop a moving part in a specific location; vetically, transversally, longitudinally

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12
Q

Grid cutoff

A

Occurs when grid and IR are not in alignment, causes image that is at the edges

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13
Q

Grid cutoff causes

A 
Tube not in detent
Innocent SID
Grid upside down
IR at an angle to CR
Result: image is to light at edges or down the down the center
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14
Q

Thermonuclear emission

A

Current creates heat and increases emission of electrons

Higher mA=hotter filament=more electrons emitted (directly proportional)

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15
Q

APR

A

Anatomically programmed radiography
A control that is programmable so exposure factors from conventional technique chart are available within computer
Select body part and technique will appear

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16
Q

Law of reciprocity

A

mAs=mAs

All combos of mA x S will produce the same amount of density

17
Q

mAs

A

Quantity of X-rays produced

Increase mAs=increase number of X-rays produced

18
Q

Distortion

A

Misrepresentation of true size or shape of object
Types=
Size-magnification
Shape- foreshortening & elongation

19
Q

OID

A

Object to image distance
OID and size distortion-direct relationship
greater OID=greater magnification
magnification causes unsharpness/loss of detail
increase SID to offset magnification

20
Q

SOD

A

Source to object distance
Closer the source to object the greater the magnification
If you increase OID or decrease SOD, increase SID

21
Q

Motion

A

Not distortion, but is undesirable
Voluntary: lack of clear instructions, breathing, children, elderly
Involuntary: heart beat, peristalsis, tremor, chill, pain

22
Q

Penumbra

A

blurring at edges of a structure

Factors: SID, OID, SOD, motion, patient factors

23
Q

Spatial Resolution

A

Ability of imaging system to differentiate between two near-by objects
Factors: OID, SID, motion, focal spot size, patient factors, quality of system (pixels)

24
Q

CR Systems

A

Computed radiography, cassette/IR has photostimulable phosphor plate
cassette placed into CR reader to create visible image
Half the radiation exposure of film screen
each image needs separate cassette

25
Q

Latent Image

A

Image that is not developed

26
Q

DDR

A

Direct digital radiography, xrays interact with amorphus selenium to create electrical charge, which is stored in thin film transistor, then sent to computer and displayed on monitor

27
Q

Receptor Exposure

A

Dependent on how many xrays reach IR
Determines if image is diagnostic
Factors: mAs*, kVp, OID, SID, grid use, filtration, collimation, anode heel effect, patient size

28
Q

Contrast

A

Difference between the shades of gray
Long scale=low contrast
Short scale=High contrast
Factors: kVp*, OID, grid use, filtration, collimation, patient size

29
Q

Recorded detail

A

true representation of structures

30
Q

Exposure index

A

Indicates IR exposure

measured by number or value

31
Q

Quantum mottle

A

noise - overall graininess of image

caused by too little exposure (mAs)

Summer 2022 (16 decks)

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