暗記メーカー

お問い合わせ
ログイン
Chapter 7: Principles of Exposure and Image Quality
  • Klyd Jeancharles

  • 問題数 69 • 9/7/2024

    記憶度

    完璧

    10

    覚えた

    26

    うろ覚え

    0

    苦手

    0

    未解答

    0

    アカウント登録して、解答結果を保存しよう

    問題一覧

  • 1

    The principle factors that affect x-ray quantity are:

    all of the above

  • 2

    The unit used to indicate the total quantity of x-rays in an exposure is:

    mAs

  • 3

    Which of the following will result in increased radiographic density? 1. Increased mA 2. Increased exposure time 3. Decreased SID

    1,2, and 3

  • 4

    The mass density of the body part is referred to as

    tissue density

  • 5

    The primary controller of radiographic density is:

    mAs

  • 6

    The difference in radiographic density between any two adjacent portions of the image is called

    contrast

  • 7

    The primary factor controlling radiographic contrast and x ray penetration is

    kVp

  • 8

    High contrast produced by using low kVp results in an image with:

    a short-scale of contrast

  • 9

    Generalized unwanted exposure on the image is called

    fog

  • 10

    A decreased in SID will result in:

    increase magnification

  • 11

    A misrepresentation in the size or shape of the structure being examined is called:

    distortion

  • 12

    The “fuzzy” unsharpness at the edges of structures or body parts is called:

    penumbra

  • 13

    The smaller the effective focal spot, the ___ the penumbra, and the ___ the spatial resolution

    less, greater

  • 14

    When a large OID is used, spatial resolution can be improved by: 1. Decreasing the SID 2. Increasing the SID 3. Maintaining the small focal spot

    2 and 3

  • 15

    Fog affects radiographic quality by causing

    decreased contrast

  • 16

    Motion of the patient, either voluntary or involuntary, during the exposure will result in decreased

    spatial resolution

  • 17

    A term used to describe a grainy or mottled image is

    quantum mottle

  • 18

    One means of controlling distortion is by control the:

    part position

  • 19

    The factors that affect the quantity of x rays in the x ray beam are: 1. mAs 2. kVp 3. Anatomically programmed radiography

    1 and 2

  • 20

    Which of the following will effect the quality of the x-ray beam?

    kVp

  • 21

    If the max is doubled, the dose to the patient will:

    double

  • 22

    According to the inverse square law, if the SID is doubled (e.g., 40 inches to 80 inches), the intensity or quantity of x-rays will

    decrease to one-fourth of the original intensity

  • 23

    The principal means of controlling involuntary motion is to

    use a short exposure time

  • 24

    Which of the following can you use to control spatial resolution

    focal spot

  • 25

    A doubling in kVp would result in four times more x rays emitted from the tube

    true

  • 26

    If the SID is increased or decreased, the density on the image is not changed

    false

  • 27

    If the SID is reduced in half (e.g., 40 inches to 20 inches), the intensity or quantity of x-rays will increase by 4 times

    true

  • 28

    The contrast on the viewing monitor is adjusted by controlling the window level

    false

  • 29

    The sharpness in the radiographic image is referred to as spatial resolution

    true

  • 30

    Increased quantum little will result in increased spatial resolution

    False

  • 31

    Unsharp edges is referred to as

    penumbra

  • 32

    Intensity is inversely proportional to the square of the distance

    inverse square law

  • 33

    Result of unequal magnification

    shape distortion

  • 34

    Magnification of a part

    size distortion

  • 35

    Object appears shorter

    foreshortening

  • 36

    Object appears longer

    elongation

  • 37

    If the radiographic image is too dark, which exposure factor(s) would you change to solve the problem?

    mAs and SID

  • 38

    When the goal is to different between tissues that have very similar densities, is a long or short scale contrast most desirable

    short scale contrast because it will enhance the difference between adjoining structures

  • 39

    List two possible causes when radiographic image appears gray and flat

    contrast is too low and scatter radiation fog

  • 40

    Three factors that will affect radiographic contrast

    kVp, fog, and collimation

  • 41

    List the five factors that will affect distortion

    OID, SID, CR angle, Part position, and IR position

  • 42

    List at least five factors that will increase spatial resolution in the radiographic image

    decreasing OID, increasing SID, smaller effective focal spot, immobilization devices, and shorter exposure time

  • 43

    The prime factors of radiographic exposure:

    mA, exposure time, kVp, SID

  • 44

    The digital term for density is

    brightness

  • 45

    Which photographic factor makes the anatomy in the image visible?

    Contrast

  • 46

    High contrast can also be called

    short scale contrast

  • 47

    Low contrast can also be called

    long scale contrast

  • 48

    Ranges of differences in the intensity of the x-ray beam after it has been attenuated by the patient:

    subject contrast

  • 49

    Radiographic distortion can be categorized in which two ways?

    size and shape distortion

  • 50

    Size distortion can be controlled by keeping ___ as low as possible

    OID

  • 51

    Two terms used to describe shape distortion:

    foreshortening and elongation

  • 52

    Quantum mottle occurs when:

    either the kVp or mAs is set too low

  • 53

    Which factors affect x-ray quantity?

    mAs, kVp, SID, and filtration

  • 54

    Which factors affect x-ray quality?

    kVp and filtration

  • 55

    Milliamperage affects the

    rate of exposure (quantity of x-ray production)

  • 56

    Which technique factors, if adjusted upward, will increase density?

    mAs and SID

  • 57

    Primary controller of radiographic contrast

    kVp

  • 58

    The distance between the tube target and the IR:

    SID

  • 59

    The distance between the subject and IR:

    OID

  • 60

    If the SID is doubled, what will happen to x ray intensity or quantity?

    The intensity will decrease 1/4

  • 61

    If the SID is reduced by 50%, what will happen to x-ray intensity or quantity?

    The intensity will increase 1/4

  • 62

    The typical SID used in radiology departments today are:

    40 and 72 inches

  • 63

    The term used to describe a dark image:

    overexposure

  • 64

    The term used to describe a light image:

    underexposure

  • 65

    A solid piece of aluminum with steps of varying thickness:

    penetrometer

  • 66

    Contrast with range of densities that are short

    short scale contrast (high contrast)

  • 67

    Contrast with range of densities that are long

    long scale contrast (low contrast)

  • 68

    Contrast is influenced by:

    fog and collimation

  • 69

    Another name for size distortion:

    magnification