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Imaging Equiment and Maintenance (3)
52問 • 5ヶ月前
  • polyyamyap
    • 通報

    問題一覧

  • 1

    converts electron to light

    output phosphor

  • 2

    converts light to electrical signal

    charge coupled device

  • 3

    sends signal to analog and digital converter

    charge coupled device

  • 4

    converts electrical signal to digital signal

    analog to digital converter

  • 5

    types of camera that ADC sends digital signal to

    vidicon and plumbicon

  • 6

    most commonly used camera

    vidicon

  • 7

    a seldomly used camera

    plumbicon

  • 8

    what is the size of tube window

    5 cm^2

  • 9

    xrays escaped through protective housing

    leakage radiation

  • 10

    reduces the intensity of leakage radiation to less than 1mGy^a /hr at 1m

    protective housing

  • 11

    it serves as an insulator against electric shock and as a thermal cushion to dissipate heat

    dielectric oil

  • 12

    which among the following are provided by protective housing: 1. mechanical support 2. contains oil 3. has cooling fans

    1, 2, and 3

  • 13

    length of a glass or metal enclosure

    30 to 50 cm

  • 14

    diameter of a glass or metal enclosure

    20 cm

  • 15

    provides longer life and less likely to fail

    metal enclosure tubes

  • 16

    made of thoriated tungsten

    Eddison effect

  • 17

    which among the following are the advantages of Eddison effect: 1. higher thermionic emission 2. lower thermionic emission 3. high melting point 4. low melting point 5. does not vaporize easily

    1, 3, and 5

  • 18

    inherent + added filter

    total filter

  • 19

    turned in and off rapidly and acts as a switch

    grid controlled tubes

  • 20

    electrons emitted from the tungsten filament form a small cloud in front of filament

    space charge

  • 21

    it is the collecteion of negatively charge of electrons

    cloud of electrons

  • 22

    the tendency if a space charge to limit emission of other electrons from filament

    space charge effect

  • 23

    makes it difficult for subsequent electrons to be emitted by the filament because of electrostatic repulsion

    space charge effect

  • 24

    thermionic emission at low kVp and high mA

    space charge limited

  • 25

    all available electrons have been used

    saturation current

  • 26

    selection of focal spot on operating console

    mA station selector

  • 27

    better for spatial resolution and small filament

    small focal spot

  • 28

    range from 0.1 mm to 1 mm and used approximately with 300 mA or less

    small focal spot

  • 29

    0.3 mm to 2 mm and used approximately with 400 mA and up

    large focal spot

  • 30

    large filament

    large focal spot

  • 31

    used for large body parts and techniques that produces high heat

    large focal spot

  • 32

    xray tube that has two filaments

    dual focus xray tube

  • 33

    atomic number of tungsten

    74

  • 34

    melting point of a tungsten

    3400 degree celcius

  • 35

    effiecient for metal dissipating heat

    thermal conductivity

  • 36

    atomic number of molybdenum

    42

  • 37

    atomic number of Rhodium

    45

  • 38

    melting point of molybdenum

    2600 degree celcius

  • 39

    melting point of Rhodium

    3200 degree celcius

  • 40

    keV of W

    69

  • 41

    keV of Mo

    19

  • 42

    keV of Rh

    23

  • 43

    used to turn the anode

    electromagnetic induction motor

  • 44

    series of EM equally spaced at neck of the tube

    stator

  • 45

    shaft made of bars of Copper and soft iron fabricated into one mass

    rotor

  • 46

    states that a smaller focal spot provides better spatial resolution

    line-focus principle

  • 47

    incorporated in xray tube targets to allow a large area for heating while maintaing small focal spot

    line focus principle

  • 48

    unfortunate byproduct of line focus principle

    anode heel effect

  • 49

    radiation intensity on the cathode side of the xray field is greater than anode side

    anode heel effect

  • 50

    smaller anode angle =

    larger heel effect

  • 51

    smaller effective focal spot =

    less radiation intensity on anode side

  • 52

    xray tube designed for projectile electron from cathode interact with target only at focal spot however some electrons bounce off the focal spot and land on other areas of target causing xrays produced from outside the focal spot

    off focus radiation

    • Imaging Equipment and Managment (1)

    Imaging Equipment and Managment (1)

    polyyamyap · 100問 · 5ヶ月前

    Imaging Equipment and Managment (1)

    Imaging Equipment and Managment (1)

    100問 • 5ヶ月前
    polyyamyap

    Imaging Equipment and Management (2)

    Imaging Equipment and Management (2)

    polyyamyap · 100問 · 5ヶ月前

    Imaging Equipment and Management (2)

    Imaging Equipment and Management (2)

    100問 • 5ヶ月前
    polyyamyap

    SET 1

    SET 1

    polyyamyap · 100問 · 5ヶ月前

    SET 1

    SET 1

    100問 • 5ヶ月前
    polyyamyap

    SET 2

    SET 2

    polyyamyap · 12問 · 5ヶ月前

    SET 2

    SET 2

    12問 • 5ヶ月前
    polyyamyap

    SET 3

    SET 3

    polyyamyap · 56問 · 5ヶ月前

    SET 3

    SET 3

    56問 • 5ヶ月前
    polyyamyap

    CRDR

    CRDR

    polyyamyap · 50問 · 5ヶ月前

    CRDR

    CRDR

    50問 • 5ヶ月前
    polyyamyap

    Radiation Biology (1)

    Radiation Biology (1)

    polyyamyap · 100問 · 5ヶ月前

    Radiation Biology (1)

    Radiation Biology (1)

    100問 • 5ヶ月前
    polyyamyap

    Radiation Biology (2)

    Radiation Biology (2)

    polyyamyap · 25問 · 5ヶ月前

    Radiation Biology (2)

    Radiation Biology (2)

    25問 • 5ヶ月前
    polyyamyap

    Film Screen Image Acquisition Processing & Image Analysis

    Film Screen Image Acquisition Processing & Image Analysis

    polyyamyap · 55問 · 5ヶ月前

    Film Screen Image Acquisition Processing & Image Analysis

    Film Screen Image Acquisition Processing & Image Analysis

    55問 • 5ヶ月前
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    Radiologic Pathology

    Radiologic Pathology

    polyyamyap · 52問 · 5ヶ月前

    Radiologic Pathology

    Radiologic Pathology

    52問 • 5ヶ月前
    polyyamyap

    IR

    IR

    polyyamyap · 33問 · 4ヶ月前

    IR

    IR

    33問 • 4ヶ月前
    polyyamyap

    Ethics and Jurisprudence

    Ethics and Jurisprudence

    polyyamyap · 15問 · 4ヶ月前

    Ethics and Jurisprudence

    Ethics and Jurisprudence

    15問 • 4ヶ月前
    polyyamyap

    CT

    CT

    polyyamyap · 5問 · 4ヶ月前

    CT

    CT

    5問 • 4ヶ月前
    polyyamyap

    Practice Test 1

    Practice Test 1

    polyyamyap · 50問 · 3ヶ月前

    Practice Test 1

    Practice Test 1

    50問 • 3ヶ月前
    polyyamyap

    問題一覧

  • 1

    converts electron to light

    output phosphor

  • 2

    converts light to electrical signal

    charge coupled device

  • 3

    sends signal to analog and digital converter

    charge coupled device

  • 4

    converts electrical signal to digital signal

    analog to digital converter

  • 5

    types of camera that ADC sends digital signal to

    vidicon and plumbicon

  • 6

    most commonly used camera

    vidicon

  • 7

    a seldomly used camera

    plumbicon

  • 8

    what is the size of tube window

    5 cm^2

  • 9

    xrays escaped through protective housing

    leakage radiation

  • 10

    reduces the intensity of leakage radiation to less than 1mGy^a /hr at 1m

    protective housing

  • 11

    it serves as an insulator against electric shock and as a thermal cushion to dissipate heat

    dielectric oil

  • 12

    which among the following are provided by protective housing: 1. mechanical support 2. contains oil 3. has cooling fans

    1, 2, and 3

  • 13

    length of a glass or metal enclosure

    30 to 50 cm

  • 14

    diameter of a glass or metal enclosure

    20 cm

  • 15

    provides longer life and less likely to fail

    metal enclosure tubes

  • 16

    made of thoriated tungsten

    Eddison effect

  • 17

    which among the following are the advantages of Eddison effect: 1. higher thermionic emission 2. lower thermionic emission 3. high melting point 4. low melting point 5. does not vaporize easily

    1, 3, and 5

  • 18

    inherent + added filter

    total filter

  • 19

    turned in and off rapidly and acts as a switch

    grid controlled tubes

  • 20

    electrons emitted from the tungsten filament form a small cloud in front of filament

    space charge

  • 21

    it is the collecteion of negatively charge of electrons

    cloud of electrons

  • 22

    the tendency if a space charge to limit emission of other electrons from filament

    space charge effect

  • 23

    makes it difficult for subsequent electrons to be emitted by the filament because of electrostatic repulsion

    space charge effect

  • 24

    thermionic emission at low kVp and high mA

    space charge limited

  • 25

    all available electrons have been used

    saturation current

  • 26

    selection of focal spot on operating console

    mA station selector

  • 27

    better for spatial resolution and small filament

    small focal spot

  • 28

    range from 0.1 mm to 1 mm and used approximately with 300 mA or less

    small focal spot

  • 29

    0.3 mm to 2 mm and used approximately with 400 mA and up

    large focal spot

  • 30

    large filament

    large focal spot

  • 31

    used for large body parts and techniques that produces high heat

    large focal spot

  • 32

    xray tube that has two filaments

    dual focus xray tube

  • 33

    atomic number of tungsten

    74

  • 34

    melting point of a tungsten

    3400 degree celcius

  • 35

    effiecient for metal dissipating heat

    thermal conductivity

  • 36

    atomic number of molybdenum

    42

  • 37

    atomic number of Rhodium

    45

  • 38

    melting point of molybdenum

    2600 degree celcius

  • 39

    melting point of Rhodium

    3200 degree celcius

  • 40

    keV of W

    69

  • 41

    keV of Mo

    19

  • 42

    keV of Rh

    23

  • 43

    used to turn the anode

    electromagnetic induction motor

  • 44

    series of EM equally spaced at neck of the tube

    stator

  • 45

    shaft made of bars of Copper and soft iron fabricated into one mass

    rotor

  • 46

    states that a smaller focal spot provides better spatial resolution

    line-focus principle

  • 47

    incorporated in xray tube targets to allow a large area for heating while maintaing small focal spot

    line focus principle

  • 48

    unfortunate byproduct of line focus principle

    anode heel effect

  • 49

    radiation intensity on the cathode side of the xray field is greater than anode side

    anode heel effect

  • 50

    smaller anode angle =

    larger heel effect

  • 51

    smaller effective focal spot =

    less radiation intensity on anode side

  • 52

    xray tube designed for projectile electron from cathode interact with target only at focal spot however some electrons bounce off the focal spot and land on other areas of target causing xrays produced from outside the focal spot

    off focus radiation