2015 FALL FINAL!!!!!<3 Flashcards Preview

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Flashcards in 2015 FALL FINAL!!!!!<3 Deck (86)
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31

amount of metal that cuts intensity to half its initial output.

Half Value Layer (HVL)

*Thicker HVL=stronger beam

32

thick part of filter at thin part of anatomy

wedge filter

33

Cut SID in half

4x greater radiation intensity

34

Double SID

1/4 radiation intensity

35

attenuation = _______ + _______

absorption + scatter

36

total absorption of incoming photon

photoelectric effect

37

xray gives up all of it's energy-knocks out an inner shell electron

Photoelectron

38

released as electrons drop down to fill holes in shells.

Characteristic radiation

39

White or Clear on radiograph

photoelectric effect/characteristic radiation

40

less than 30 kV (not in diagnostic)-TOO LOW

Classical/Coherent/Unmodified/White Scatter

41

Modified scatter. Wray gives up some but not all of it's energy to knock out an outer shell electron.

Compton

42

Compton makes it's presence known through

SCATTER

43

Scatter is _____ on the radiograph

GRAY

44

Are Pair Production and Photodisintegration in diagnostic?

No, too high

45

when xrays pass through without interacting with the atoms in the body. Shows up black

Remnant/Transmission/Exit Radiation

46

picture element that makes up the Matrix

pixel

47

larger matrix & greater number of pixels=

improved spatial resolution

48

Increasing pixel density and decreasing pixel pitch ________ spatial resolution

INCREASES

49

A. OD of 1=
B. OD of 2=
C. OD of 3=

A. 1/10
B. 1/100
C. 1/1000

COUNT THE ZEROS

50

Density (Screen Film)=

Brightness (Digital)

51

Recorded detail (Screen Film)=

Spatial Resolution (Digital)

52

Contrast (Screen Film)=

Grayscale/dynamic range (Digital)

53

utilizes a plate that is put in a reader to retrieve image

CR

54

utilizes a digital plate or digital bucky that sends image directly to computer

DR

55

Main advantage of CR/DR

Post processing (window and leveling)

56

1. overall darkness on radiograph
2. controlled by

1. Density
2. mAs

57

To double density you must...

Double mAs

58

To cut density in half you must...

cut mAs in half

59

kVp controls _________

SCATTER

60

Scatter is _______

DENSITY