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ch 9,10,11

ch 9,10,11
22問 • 1年前
  • ユーザ名非公開
    • 通報

    問題一覧

  • 1

    Two ultrasound systems are identical except for the pulse repetition period (PRP) of the emitted pulse. Which system will have the deeper focus?

    their foci will be at the same depth

  • 2

    Axial resolution affects structures that are

    positioned along the scan beam

  • 3

    The focus of an ultrasound beam is the location where the ____.

    optimum transverse resolution is

  • 4

    Wavelength has the greatest effect on

    axial resolution

  • 5

    When using standard ultrasonic imaging instrumentation, lateral resolution has a higher numerical value than the axial resolution.

    True

  • 6

    Which of the following transducers will have the poorest axial resolution?

    1.7 MHz & 5 cycles per pulse

  • 7

    Which of the following transducers has the best axial resolution?

    2.6 MHz & 2 cycles per pulse

  • 8

    When using an instrument typical of today's imaging devices, a higher frequency transducer is likely to improve axial resolution. A. True B. False

    True

  • 9

    What will lower the value of an ultrasound system's lateral resolution?

    use an acoustic lens

  • 10

    The diameter of a disc-shaped, unfocused piezoelectric crystal is 1 cm. What is the best estimate for the minimum lateral resolution of the US system?

    5 mm

  • 11

    Which of these terms means adjustable focusing or multi-focusing?

    phased array

  • 12

    Which of these techniques is consistent with variable or multifocusing?

    electronic

  • 13

    Lateral resolution is equal to ____.

    Beam width

  • 14

    The near zone length should be kept as short as possible.

    False

  • 15

    Which situation produces the best axial resolution?

    4 MHz with 2 cycles per pulse

  • 16

    Axial resolution

    is affected by wavelength

  • 17

    One way that a sonographer can alter the axial resolution achieved during an exam is to adjust the maximum imaging depth. A. True B. False

    False

  • 18

    With a specific ultrasound system and transducer, the system’s axial resolution is invariant, and the sonographer can do nothing to improve it. A. True B. False

    True

  • 19

    Frequency and focal depth are _____ related. A. Directly B. Inversely C. Reciprocally D. Not ​

    Directly

  • 20

    Which of the following determines the frequency of sound created by a pulsed wave transducer? A. crystal thickness and impedance B. speed of sound in ceramic and diameter C. speed of sound and density of the ceramic D. thickness and speed of sound in the ceramic

    thickness and speed of sound in the ceramic

  • 21

    Which of the following determine the focal length of a sound beam? A. crystal thickness and impedance B. speed of sound in ceramic and frequency C. frequency of sound and density of the ceramic D. diameter of ceramic and frequency of sound

    diameter of ceramic and frequency of sound

  • 22

    Which of the following determine the spread of a sound beam in the far field? A. crystal thickness and impedance B. speed of sound in ceramic and frequency C. frequency of sound and density of the ceramic D. diameter of ceramic and frequency of sound

    diameter of ceramic and frequency of sound

    • ch 6 AP

    ch 6 AP

    ユーザ名非公開 · 20問 · 1年前

    ch 6 AP

    ch 6 AP

    20問 • 1年前
    ユーザ名非公開

    ch 9

    ch 9

    ユーザ名非公開 · 15問 · 1年前

    ch 9

    ch 9

    15問 • 1年前
    ユーザ名非公開

    ch 11

    ch 11

    ユーザ名非公開 · 15問 · 1年前

    ch 11

    ch 11

    15問 • 1年前
    ユーザ名非公開

    ch 16

    ch 16

    ユーザ名非公開 · 15問 · 1年前

    ch 16

    ch 16

    15問 • 1年前
    ユーザ名非公開

    ch 12

    ch 12

    ユーザ名非公開 · 15問 · 1年前

    ch 12

    ch 12

    15問 • 1年前
    ユーザ名非公開

    ch 13

    ch 13

    ユーザ名非公開 · 15問 · 1年前

    ch 13

    ch 13

    15問 • 1年前
    ユーザ名非公開

    ch 14

    ch 14

    ユーザ名非公開 · 15問 · 1年前

    ch 14

    ch 14

    15問 • 1年前
    ユーザ名非公開

    ch 17

    ch 17

    ユーザ名非公開 · 15問 · 1年前

    ch 17

    ch 17

    15問 • 1年前
    ユーザ名非公開

    ch 19 (1)

    ch 19 (1)

    ユーザ名非公開 · 14問 · 1年前

    ch 19 (1)

    ch 19 (1)

    14問 • 1年前
    ユーザ名非公開

    ch 15

    ch 15

    ユーザ名非公開 · 5問 · 1年前

    ch 15

    ch 15

    5問 • 1年前
    ユーザ名非公開

    ch 4

    ch 4

    ユーザ名非公開 · 84問 · 1年前

    ch 4

    ch 4

    84問 • 1年前
    ユーザ名非公開

    ch 12 & 13

    ch 12 & 13

    ユーザ名非公開 · 23問 · 1年前

    ch 12 & 13

    ch 12 & 13

    23問 • 1年前
    ユーザ名非公開

    ch 14&15

    ch 14&15

    ユーザ名非公開 · 17問 · 1年前

    ch 14&15

    ch 14&15

    17問 • 1年前
    ユーザ名非公開

    9-17

    9-17

    ユーザ名非公開 · 80問 · 1年前

    9-17

    9-17

    80問 • 1年前
    ユーザ名非公開

    ch18

    ch18

    ユーザ名非公開 · 53問 · 1年前

    ch18

    ch18

    53問 • 1年前
    ユーザ名非公開

    ch19-20

    ch19-20

    ユーザ名非公開 · 34問 · 1年前

    ch19-20

    ch19-20

    34問 • 1年前
    ユーザ名非公開

    ch21-22

    ch21-22

    ユーザ名非公開 · 20問 · 1年前

    ch21-22

    ch21-22

    20問 • 1年前
    ユーザ名非公開

    問題一覧

  • 1

    Two ultrasound systems are identical except for the pulse repetition period (PRP) of the emitted pulse. Which system will have the deeper focus?

    their foci will be at the same depth

  • 2

    Axial resolution affects structures that are

    positioned along the scan beam

  • 3

    The focus of an ultrasound beam is the location where the ____.

    optimum transverse resolution is

  • 4

    Wavelength has the greatest effect on

    axial resolution

  • 5

    When using standard ultrasonic imaging instrumentation, lateral resolution has a higher numerical value than the axial resolution.

    True

  • 6

    Which of the following transducers will have the poorest axial resolution?

    1.7 MHz & 5 cycles per pulse

  • 7

    Which of the following transducers has the best axial resolution?

    2.6 MHz & 2 cycles per pulse

  • 8

    When using an instrument typical of today's imaging devices, a higher frequency transducer is likely to improve axial resolution. A. True B. False

    True

  • 9

    What will lower the value of an ultrasound system's lateral resolution?

    use an acoustic lens

  • 10

    The diameter of a disc-shaped, unfocused piezoelectric crystal is 1 cm. What is the best estimate for the minimum lateral resolution of the US system?

    5 mm

  • 11

    Which of these terms means adjustable focusing or multi-focusing?

    phased array

  • 12

    Which of these techniques is consistent with variable or multifocusing?

    electronic

  • 13

    Lateral resolution is equal to ____.

    Beam width

  • 14

    The near zone length should be kept as short as possible.

    False

  • 15

    Which situation produces the best axial resolution?

    4 MHz with 2 cycles per pulse

  • 16

    Axial resolution

    is affected by wavelength

  • 17

    One way that a sonographer can alter the axial resolution achieved during an exam is to adjust the maximum imaging depth. A. True B. False

    False

  • 18

    With a specific ultrasound system and transducer, the system’s axial resolution is invariant, and the sonographer can do nothing to improve it. A. True B. False

    True

  • 19

    Frequency and focal depth are _____ related. A. Directly B. Inversely C. Reciprocally D. Not ​

    Directly

  • 20

    Which of the following determines the frequency of sound created by a pulsed wave transducer? A. crystal thickness and impedance B. speed of sound in ceramic and diameter C. speed of sound and density of the ceramic D. thickness and speed of sound in the ceramic

    thickness and speed of sound in the ceramic

  • 21

    Which of the following determine the focal length of a sound beam? A. crystal thickness and impedance B. speed of sound in ceramic and frequency C. frequency of sound and density of the ceramic D. diameter of ceramic and frequency of sound

    diameter of ceramic and frequency of sound

  • 22

    Which of the following determine the spread of a sound beam in the far field? A. crystal thickness and impedance B. speed of sound in ceramic and frequency C. frequency of sound and density of the ceramic D. diameter of ceramic and frequency of sound

    diameter of ceramic and frequency of sound