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Chapter 5: X-Ray Production
  • Klyd Jeancharles

  • 問題数 51 • 9/6/2024

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    問題一覧

  • 1

    The penetrating power of the x-ray beam is controlled by varying the:

    peak kilovoltage (kVp)

  • 2

    The current, or volume, of x-ray production is measured in units of

    milliamperage (mA)

  • 3

    An x-ray exposure is made using the following factors: 200 mA, 0.02 seconds, 80 kVp, 40 inches SID. The value of the mad for this exposure is

    4.

  • 4

    A dual-focus x-ray tube has: 1. Two filaments 2. Two focal spot sizes 3. Two anodes

    1 and 2

  • 5

    What is the standard rotation speed of the x-ray tube’s anode?

    3,600 RPM

  • 6

    The rate of current flow across the x-ray tube is measured in

    mA

  • 7

    Label the following image

    electron stream size, actual focal spot size, effective focal spot size

  • 8

    The device for removing long-wavelength radiation from the primary x-ray beam is the

    filter

  • 9

    What is the effect on the x-ray beam of the kVp is increased?

    results in low contrast

  • 10

    An electron cloud surrounding the filament of the cathode is referred to as a:

    space charge

  • 11

    Of what material of target/anode made?

    Tungsten

  • 12

    If the x-ray tube had 0.5 mm AL equiv inherent filtration , and the collimator provides an additional 1.25 mm AL equiv, how much additional filtration must be added to meet minimum safety requirements?

    0.75 mm AI equiv

  • 13

    Free electrons for x-ray production come from the

    filament

  • 14

    What is the % of characteristic radiation that produced below 70 kVp?

    0%

  • 15

    X-ray equipments that are able to produce 70 kVp or more is required to have total filtration of at least:

    2.5 mm Al equiv

  • 16

    The creation of the space charge in the x-ray tube produces

    thermionic emission

  • 17

    More than 99% of the energy of the electron stream is converted into

    heat

  • 18

    Image sharpness is determined by

    the size of the effective focal spot

  • 19

    The unit used to indicate the total quantity of x-ray exposure is

    milliampere-seconds (mAs)

  • 20

    Above 70 kVp, what % of photons is created by bremsstrahlung radiation?

    85%

  • 21

    The mA or mAs used for an exposure determines

    quantity of x-ray production

  • 22

    What are the two rotation speeds for the anode?

    3,600 and 10,000 rpm

  • 23

    The degree of angulation of the z-ray tube target (anode) will determine the

    difference between the actual focal spot and effective focal spot

  • 24

    Is the anode side of the x-ray positive or negative?

    positive

  • 25

    The high speed rotation (10,000 rpm) of the anode enables

    greater dissipation of heat from high technical factors

  • 26

    The power and speed of the electrons inside the x-ray tube and the energy of the x-rays that emerge are controlled by the

    kilovoltage (kVP)

  • 27

    To take advantage of the anode heel effect when making a radiograph of the femur in recumbent Anteroposterior on a 14 x17 inch image receptor (IR) at a 40 inch SID, the patient should be placed so that the

    head is toward the cathode end of the tube

  • 28

    Name the tree components that contribute to inherent filtration.

    glass of tube, surrounding oil of tube, and filtration from the mirror

  • 29

    What is the difference in radiation intensity between the anode and cathode end of the x-ray beam when a 14-17 inch IR is used at a 40 inch SID

    45%

  • 30

    Doubling the mA will result in: 1. Increased patient dose 2. Twice as many photons in the x-ray beam 3. Increased radiographic density

    1,2, and 3

  • 31

    The degree of angulation of the x-ray tube target will determine the

    size of the actual and effective focal spot

  • 32

    The anode heel effect is a phenomenon of x-ray production that results in

    uneven distribution of radiation within the x-ray field

  • 33

    Roentgen discovered x-rays while working with a(n) ____ tube

    Crookes

  • 34

    The purpose of rotating the anode of the x-ray tube is to:

    increase the heat capacity of the anode

  • 35

    Characteristic radiation is not produced below which kVp level?

    70 kVp

  • 36

    How is the volume or the intensity of x-rays affected by the heel effect?

    The intensity of the x-ray beam is least toward the anode end of the field

  • 37

    What type of radiation production makes up the greatest portion of the x-ray beam, bremsstrahlung or characteristic?

    bremsstrahlung

  • 38

    What type of motor is used to turn the anode inside the x-ray tube?

    an electromagnetic induction motor

  • 39

    When electrons in the outer most orbital shells move so far from the nucleus that they are no longer held in orbit but are flung out the atom.

    thermionic emission

  • 40

    What is the term used to describe the heating of an element to a hot temperature and the expanding of the electrons in the atom?

    Thermionic emission

  • 41

    If a patient has a body part that has a very thick portion and a very thin portion, which aspect of the x-ray tube should be placed over the thinnest area?

    the anode end of the tube

  • 42

    What is added to the port to remove the king-wavelength radiation?

    Aluminum filter

  • 43

    The primary purpose of filtration is to

    reduce patient dose

  • 44

    The majority of photons in the x-ray beam are created by which process?

    Bremsstrahlung radiation

  • 45

    Of what material is the filament made?

    Tungsten

  • 46

    When is the large focal spot used?

    To dissipate the heat of large exposures

  • 47

    What is the name of the radiation produced when an incoming electron into the anode is suddenly braked and deviated?

    Bremsstrahlung radiation

  • 48

    Is the cathode side of the x-ray tube positive or negative?

    negative

  • 49

    The amount of detail seen in an x-ray image is referred to as

    spatial resolution

  • 50

    How much target is needed in a general purpose tube?

    12 degrees

  • 51

    Label the following image

    tungsten target, heated tungsten filament, evacuated Pyrex envelope, cathode, and anode