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ct midterm 3
41問 • 1年前
  • Shanks Redhaired
  • 通報

    問題一覧

  • 1

    2 dimensional

    pixel

  • 2

    Pixel size formula

    fov/matrix size

  • 3

    Voxel formula

    pixel size×slice thickness

  • 4

    The tissue volume

    voxel

  • 5

    Refers to the numeric information contained in each pixel

    ct number/hounsfield unit

  • 6

    The diameter of image reconstruction

    fov

  • 7

    FOV is increased, fixed matrix size

    increase/larger pixel size

  • 8

    Fixed FOV, increased matrix size

    decrease/smaller pixel size

  • 9

    Compute the pixel size for the following characteristics of CT imagers FOV of 20 cm, 128 x 128 matrix FOV of 20 cm, 512 x 512 matrix FOV 36 cm, 512 x 512 matrix

    1.56/1.6, 0.39/0.4, 0.7

  • 10

    If each of the three scans in the preceding questions was conducted at 5-mm slice thickness, what would be the respective voxel sizes?

    12.8 mm³, 0.8 mm³, 2.45 mm³

  • 11

    Used to assess the nature of the tissue

    ct number/hounsfield unit

  • 12

    scale of CT number

    HU

  • 13

    Ct number range

    -1000 to +3000

  • 14

    LAC of bone

    0.528

  • 15

    LAC of muscle

    0.237

  • 16

    LAC of brain white

    0.213

  • 17

    LAC of brain grey

    0.212

  • 18

    LAC of blood

    0.208

  • 19

    LAC of water

    0.206

  • 20

    LAC of fat

    0.185

  • 21

    LAC of lung

    0.093

  • 22

    LAC of air

    0.0004

  • 23

    Hounsfield unit formula

    μt-μw/μw×k

  • 24

    HU of air

    -1000

  • 25

    HU of lungs

    -250 to -850

  • 26

    HU of fat

    -100

  • 27

    HU of orbit

    -25

  • 28

    HU of water

    0

  • 29

    HU of cyst

    -5 to +10

  • 30

    HU of fluid

    0 to +25

  • 31

    HU of tumor

    +20 to +100

  • 32

    HU of blood (fluid)

    +20 to +50

  • 33

    HU of blood (clothed)

    +50 to +75

  • 34

    HU of blood (old)

    +10 to +15

  • 35

    HU of brain

    +20 to +40

  • 36

    HU of muscle

    +35 to +50

  • 37

    HU of gallbladder

    +5 to +30

  • 38

    HU of liver

    +40 to +70

  • 39

    HU of aorta

    +35 to +50

  • 40

    HU of bone

    +150 to +1000

  • 41

    HU of metal

    +2000 to +4000

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    問題一覧

  • 1

    2 dimensional

    pixel

  • 2

    Pixel size formula

    fov/matrix size

  • 3

    Voxel formula

    pixel size×slice thickness

  • 4

    The tissue volume

    voxel

  • 5

    Refers to the numeric information contained in each pixel

    ct number/hounsfield unit

  • 6

    The diameter of image reconstruction

    fov

  • 7

    FOV is increased, fixed matrix size

    increase/larger pixel size

  • 8

    Fixed FOV, increased matrix size

    decrease/smaller pixel size

  • 9

    Compute the pixel size for the following characteristics of CT imagers FOV of 20 cm, 128 x 128 matrix FOV of 20 cm, 512 x 512 matrix FOV 36 cm, 512 x 512 matrix

    1.56/1.6, 0.39/0.4, 0.7

  • 10

    If each of the three scans in the preceding questions was conducted at 5-mm slice thickness, what would be the respective voxel sizes?

    12.8 mm³, 0.8 mm³, 2.45 mm³

  • 11

    Used to assess the nature of the tissue

    ct number/hounsfield unit

  • 12

    scale of CT number

    HU

  • 13

    Ct number range

    -1000 to +3000

  • 14

    LAC of bone

    0.528

  • 15

    LAC of muscle

    0.237

  • 16

    LAC of brain white

    0.213

  • 17

    LAC of brain grey

    0.212

  • 18

    LAC of blood

    0.208

  • 19

    LAC of water

    0.206

  • 20

    LAC of fat

    0.185

  • 21

    LAC of lung

    0.093

  • 22

    LAC of air

    0.0004

  • 23

    Hounsfield unit formula

    μt-μw/μw×k

  • 24

    HU of air

    -1000

  • 25

    HU of lungs

    -250 to -850

  • 26

    HU of fat

    -100

  • 27

    HU of orbit

    -25

  • 28

    HU of water

    0

  • 29

    HU of cyst

    -5 to +10

  • 30

    HU of fluid

    0 to +25

  • 31

    HU of tumor

    +20 to +100

  • 32

    HU of blood (fluid)

    +20 to +50

  • 33

    HU of blood (clothed)

    +50 to +75

  • 34

    HU of blood (old)

    +10 to +15

  • 35

    HU of brain

    +20 to +40

  • 36

    HU of muscle

    +35 to +50

  • 37

    HU of gallbladder

    +5 to +30

  • 38

    HU of liver

    +40 to +70

  • 39

    HU of aorta

    +35 to +50

  • 40

    HU of bone

    +150 to +1000

  • 41

    HU of metal

    +2000 to +4000