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fluoroscopy 2
  • Shanks Redhaired

  • 問題数 100 • 5/24/2024

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    問題一覧

  • 1

    The resolution of the fluoroscopic image is directly affected by the WHAT?. Many video monitoring systems are limited to a 525-line raster pattern where fluoroscopic geometric factors affect the overall resolution of the image.

    video monitoring system

  • 2

    Many video monitoring systems are limited to a WHAT? where fluoroscopic geometric factors affect the overall resolution of the image.

    525-line raster pattern

  • 3

    Many video monitoring systems are limited to a 525-line raster pattern where WHAT? affect the overall resolution of the image.

    fluoroscopic geometric Factors

  • 4

    Many video monitoring systems are limited to a 525-line raster pattern where fluoroscopic geometric factors affect the

    overall resolution of the image.

  • 5

    It is affected by the same factors as in static radiography

    contrast

  • 6

    It is directly affected by the video monitoring system

    resolution

  • 7

    The fluoroscopic geometric factors include

    Mi FITFOV minification flux gain focal point input and output phosphor diameter thickness viewing system resolution oid

  • 8

    Affected by same parameters as static radiography

    size distortion

  • 9

    Size distortion is affected by

    same parameters as static radiography

  • 10

    Primarily afftects the size distortion

    oid

  • 11

    Geometric problems in what?

    shape of input screen

  • 12

    shape helps reduce shape distortion, but does not remove it all

    concave shape

  • 13

    Concave shape helps reduce what?

    shape distortion

  • 14

    Vignetting or pin cushion effect

    shape distortion

  • 15

    the presence of a brighter light intensity at the center of the fluoroscopic image on an image intensifier than at the periphery of the field.

    vignetting or pin cushion effect

  • 16

    Blotchy, grainy appearance

    quantum mottle

  • 17

    Quantum mottle appearance

    Blotchy, grainy appearance

  • 18

    Quantum mottle is caused by

    too little exposure

  • 19

    Remedial for quantum mottle

    increase mA

  • 20

    is the grainy appearance which is caused by insufficient radiation to produce a uniform image.

    quantum mottle

  • 21

    Quantum mottle is the grainy appearance which is caused by WHAT? To produce a uniform image.

    insufficient radiation

  • 22

    Quantum mottle is controlled by

    mA and time

  • 23

    It is controlled by the mA and time

    quantum mottle

  • 24

    assist in reducing quantum mottle.

    increasing the efficiency of any of the factors

  • 25

    Viewing system

    video viewing system video camera tubes video camera CCD video monitor digital

  • 26

    Video camera tubes

    cathode anode

  • 27

    Video camera coupled to output screen and monitor

    closed circuit television

  • 28

    Vidicon or Plumbicon tube

    video camera

  • 29

    Video cameras

    Vidicon or Plumbicon tube ccd

  • 30

    plumbicon or vidicon tube difference

    target materials plumbicon has faster response time

  • 31

    The standard types video camera are called

    vidicon plumbicon ccd

  • 32

    Video camera tubes are similar in operation

    vidicon plumbicon

  • 33

    The video camera tubes have WHAT which maintains a vacuum and provides support for the internal components.

    glass envelope

  • 34

    The video camera tubes have a glass envelope which what?

    maintains a vacuum and provides support for the internal components.

  • 35

    Inside the TV camera tube are what?

    cathode electron gun, electrostatic or focusing coils, and the target assembly that is also the anode.

  • 36

    is a video camera tube design in which the target material is a photoconductor.

    vidicon tube

  • 37

    Vidicon tube is a video camera tube design in which the target material is a what?

    photoconductor.

  • 38

    a storage-type camera tub

    vidicon tube

  • 39

    The vidicon is a storage-type camera tube in which WHAT? is formed by the imaged scene radiation on a photoconductive surface which is then scanned by a beam of low-velocity electrons.

    charge-density pattern

  • 40

    The vidicon is a storage-type camera tube in which a charge-density pattern is formed by the on WHAT? a photoconductive surface which is then scanned by a beam of low-velocity electrons.

    imaged scene radiation

  • 41

    The vidicon is a storage-type camera tube in which a charge-density pattern is formed by the imaged scene radiation on a photoconductive surface which is then scanned by what?

    beam of low-velocity electrons.

  • 42

    Used frequently in broadcast camera applications

    plumbicon

  • 43

    these tubes have low output, but a high signal-to-noise ratio.

    plumbicon tube

  • 44

    Video camera tubes components

    cathode electromagnetic focusing coils electrostatic deflecting coils anode

  • 45

    Shapes electron beam

    control grid

  • 46

    Cathode assembly

    heating assembly control grid

  • 47

    Cathode heating assembly

    electron gun thermionic emission

  • 48

    Electron gun and thermionic emission is found in

    heating assembly

  • 49

    Some fluoroscopy systems use a this instead of a video tube

    CCD

  • 50

    a semiconducting device capable of storing a charge from light photons striking a photosensitive surface.

    ccd

  • 51

    stores these electrons which make up the latent image.

    CCD

  • 52

    The ccd stores these electrons which make up what

    latent image

  • 53

    A video signal is then emitted in a what? by discharging the stored electrons as pulses.

    raster scanning pattern

  • 54

    A video signal is then emitted in a raster scanning pattern by

    discharging the stored electrons as pulses.

  • 55

    The main advantage of the CCD is the extremely fast discharge time which is useful in WHAT where high-speed imaging is critical to visualizing blood flow.

    cardiac catheterization

  • 56

    The main advantage of the CCD is the extremely fast discharge time which is useful in cardiac catheterization where high-speed imaging is critical to what?

    visualizing blood flow.

  • 57

    The CCD operates

    lower voltage

  • 58

    it is more sensitive than video tubes,

    ccd

  • 59

    When ccd operated at low voltage it makes the ccd what?

    prolonged its life

  • 60

    the type of monitor used to display the fluoroscopic image

    cathode ray tube

  • 61

    CRT is like

    a video tube

  • 62

    Crt Like a video tube, it consists of a

    vacuum tube, an electron gun (cathode) with focusing and deflecting electromagnets for steering the electron beam.

  • 63

    Like a video tube, it consists of a vacuum tube, an electron gun (cathode) with focusing and deflecting electromagnets for what?

    steering the electron beam

  • 64

    It is much larger than the video tube and has an anode assembly with a fluorescent phosphor coated on the inside of the front screen.

    crt

  • 65

    It is much larger than the video tube and has an anode assembly with a what? on the inside of the front screen.

    fluorescent phosphor coated

  • 66

    Anode assembly in crt

    face plate single plate target

  • 67

    Positively charged thin film of graphite

    signal plate

  • 68

    Signal plate is what

    Positively charged thin film of graphite

  • 69

    Changes light pattern to electronic signal sent to video system

    target

  • 70

    Target function

    Changes light pattern to electronic signal sent to video system

  • 71

    Thin insulating mica minerals

    target

  • 72

    Thin insulating mica minerals are what

    group of sheet silicate or phyllosilicate

  • 73

    Matrix of globules of photoconductive material

    target

  • 74

    Target assembly

    thin insulating mica minerals matrix of globules of photo conductive minerals

  • 75

    Target of vidicon

    antimony trisulfide

  • 76

    Target of plumbicon

    lead oxide

  • 77

    Semiconducting device

    video camera ccd

  • 78

    Video camera ccd emits electron in what?

    in proportion to amount of light striking photoelectric cathode

  • 79

    Fast discharge eliminates lag

    video camera ccd

  • 80

    Emits electrons in proportion to amount of light striking photoelectric cathode

    video camera ccd

  • 81

    Operate at lower voltages than video tubes

    video camera ccd

  • 82

    More durable than video tubes

    video camera ccd

  • 83

    Image intensifier output screen coupled to TFTs

    digital fluoroscopy

  • 84

    Image intensifier output screen coupled to what?

    tft

  • 85

    In digital fluoroscopy it is coupled to TFTs

    image intensifier output screen

  • 86

    These are connected to each pixel element

    tft photodiode

  • 87

    limited in favor of radiation exposure concerns

    resolution

  • 88

    Resolution limited in favor of radiation exposure concerns

    digital fluoroscopy

  • 89

    Resolution limited in

    favor of radiation exposure concerns

  • 90

    Recording the Fluoroscopic Image

    Dynamic systems Cine film systems Videotape recording Static spot filming systems

  • 91

    Film used in recording the fluoroscopic image

    105 chip film

  • 92

    Dynamic system

    cine film videotape

  • 93

    Movie camera intercepts image

    cine film system

  • 94

    Cine film formats

    16 mm and 35 mm

  • 95

    Record series of static exposures at high speed

    cine film system

  • 96

    Record series of static exposures at what

    high speed

  • 97

    Record what? at high speed

    series of static exposure

  • 98

    Cine film frame

    30-60 frames per second

  • 99

    Offer increased resolution

    cine film system