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Midterm > Imaging Equipment and Maintenance > Flashcards

Imaging Equipment and Maintenance Flashcards

1
Q

Is the most frequent used system. It consists of two sets of rails mounted to the ceiling directly over the radiographic table.

A

Ceiling support

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2
Q

When x-ray tube is centered above the examination table at the standard SID, the x-ray tube is in a preferred _____ position.

A

Detent

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3
Q

Has a single column with rollers at each end, one attached to a ceiling-mounted rail and other attached to a floor-mounted rail.

A

Floor ceiling support system

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4
Q

Interventional radiology suites often are quipped with C shape arm

A

C arm support system

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5
Q

guards against excessive radiation exposure and electric shock.

A

Protective housing

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6
Q

how many leakage of radiation thus the protective housing reduce?

A

less than 100mR/hr at 1m

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7
Q

30 to 50 cm long and 20 cm in diameter` size of x-ray tube
Pyrex glass to enable to withstand the tremendous heat generated.

A

GLASS/ METAL ENVELOPE OR ENCLOSURE

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8
Q

what is the area of the tube window?

A

5cm^2

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9
Q

what causes arcing and tube failure?

A

as the glass enclosure ages, some of the tungsten vaporizes to the walls of enclosure.

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10
Q

Is the negative side of the x-ray tube

A

cathode

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11
Q

what is the melting point of the tungsten?

A

3410 degree Celsius

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12
Q

Is a coil of wire similar to that in a kitchen toaster, except much smaller

A

Filament

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13
Q

what is the filament made out of?

A

thoriated tungsten

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14
Q

what is the dimensions of the filament?

A

2mm in diameter, 1 or 2 cm long

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15
Q

why does the thorium is added to the filament?

A

increases the efficiency of the thermionic emission and prolongs tube life

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16
Q

an x-ray tube filament emits electrons when it is heated. When the current through the filament is sufficiently high, the outer electrons of the filament atoms are “boiled off” and ejected from the filament.

A

thermionic emission

17
Q

The filament is embedded in a metal cup called the

A

Focusing Cup

18
Q

without focusing cup the electron beams are

A

spread beyond the anode

19
Q

with focusing cup the electron beams are

A

condensed and directed to the target

20
Q

what does it call when the xray tube have 2 focal spots?

A

dual spot

21
Q

is used when better spatial resolution is required. SFS range from 0.1 to 1mm

A

small focal spot

22
Q

is used when large body parts are imaged and when other techniques that produce high heat are required.
LFS range from 0.3 to 2mm

A

large focal spot

23
Q

the positive side of the xray tube

A

anode

24
Q

what are the two types of anode

A

stationary and rotating

25
Q

x-rays tubes are used in dental x-ray imaging system, some portable imaging system and other special purpose units in which high tube current and power are not required

A

stationary anode

26
Q

is a shaft-like structure made primarily of copper.

A

rotor

27
Q

attaches the rotating target area to the rotor.

A

stem

28
Q

is a circular, disk-like structure with a slanted or beveled edge. –It serves as the target for receiving electrons as they move from the cathode to anode.

A

target

29
Q

is the area of the anode struck by the electrons from the cathode.

A

target

30
Q

what are the reasons why tungsten is the element of choice in xray tube?

A

high atomic number (74)
thermal conductivity (efficeint for dissipating heat)
high melting point (3410)

31
Q

x-ray tube allows the electron beam to interact with as much larger target area.

A

rotating anode

32
Q

RPM of the rotating anode

A

3410- 10,000 RPM

33
Q

copper, because it is poor heat conductor.

A

STEM

34
Q

is used to turn the anode.

A

induction motor

35
Q

it is an agulation of the anode to increase the focal spot size but still remain the small effective focal spot size that can result to increase in recorded detail and better spatial resolution

A

line focus principle

36
Q

two focal spot is called

A

biangular target

37
Q

results in smaller effective focal spot and less radiation intensity on the anode side of the x-ray beam.

A

anode heel effect

38
Q

The _____ the anode angle, the _____ is the heel effect.

A

smaller, larger

39
Q

some of the electrons bounce off the focal spot and then land on the other areas of the target, causing x-rays to be produced from outside the focal spot.

A

extrafocal radiation

Midterm (4 decks)

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