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Freshmen Make Up Exam > Make Up > Flashcards

Flashcards in Make Up Deck (63)
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31

Sensitivity speck

Electrons traps in conductive layer

32

increasing filtration

primary purpose rad protection
lowers patient dose
increases beam energy by removing weak beams
decreases beam quantity by removing weak beams
Most scatter results from Compton
Filtration does affect image contrast by affecting the differential absorption (reduces subject contrast)

33

Volvulus

Twisting of intestines on its own mesentery--beak sign cork-screw look.

34

Hallux

big toe

35

Annual limit for techs

5 rem=0.05 Sv

36

Normal Cretinine

0.6-1.5mg/100ml

37

Geometric Factors

magnification, distortion, focal spot blur

38

XRs transmitted w/o interaction

rad imaging

39

visibility of detail

is affected by contrast and OD

40

Sella Turcica

3/4 superior and 3/4 anterior to EAM

41

Waters

OML is at 37 degrees to IR
MML is perpendicular to IR
CR at acanthion
Petrous Ridges below maxillary sinuses

42

Modified Waters

OML 55 degrees to IR
Orbits shown w/o distortion (orbital floors perpendicular to IR)
Best for orbital fractures

43

Haustra

normal pouches/sacs along LG intestines

44

Principle function of grid

improve image contrast

45

The ? is the source of radiation in the x-ray tube.

focal spot

46

Because of the line focus principle, the effective focal spot size decreases with ? decreasing.

target angle

47

The negative side of the x-ray tube holds the

filament

48

what is the most common cause of tube failure?

tungston vaporization

49

The filament is made up of

tungsten

50

Thermionic emission at the filament creates

space charge

51

The rotating anode is turned by a

magnetic field

52

When electrons bombard the target, ?% of their kinetic energy is converted to heat.

99%

53

The target of the rotating anode is usually coated with a ? alloy.

tungsten

54

The ? is the source of radiation in the x-ray tube.

focal spot

55

Because of the line focus principle, the effective focal spot size decreases with decreasing

target angle

56

High capacity tube rotors revolve at

10,000 rpm

57

The x-ray intensity is lower on the anode side of the tube because of the ?

heel effect

58

Tube failure can occur from

long exposure times

59

The filament in an x-ray tube is about ?cm in length

1 to 2

60

A dual focus tube has two

filaments