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Physics Chapter 25

Physics Chapter 25
20問 • 1年前
  • ユーザ名非公開
  • 通報

    問題一覧

  • 1

    Fluoroscopy was developed so that radiologists could view _______ images.

    dynamic

  • 2

    What is the milliamperage used during fluoroscopy?

    £5mA

  • 3

    The image intensifier improved fluoroscopy by increasing image _________.

    brightness

  • 4

    Image intensified fluoroscopy is performed at illumination levels similar to ________.

    radiograph viewing

  • 5

    Visual acuity in the eye is greatest at the ________ , where _______ are concentrated.

    fovea centralis; cones

  • 6

    The ability of the eye to detect differences in brightness levels is termed _______.

    contrast perception

  • 7

    The ______ in the retina are stimulated by ______ light; the ________ are stimulated by _____ light.

    rods; low; cones; bright

  • 8

    With image intensification the light level is raised to _____ vision.

    photopic

  • 9

    X-rays that exit the patient and enter the image intensifier first interact with the _______.

    input phosphor

  • 10

    The output phosphor of the image intensifier is composed of ______.

    zinc cadmium sulfide

  • 11

    The input phosphor converts ______ to _______.

    x-rays; light

  • 12

    The in the image intensifier emits electrons when it is stimulated by light photons.

    photocathode

  • 13

    The number of light photons emitted within the image intensifier is ______ to the amount of x-ray photons exiting the patient.

    directly proportional

  • 14

    The kinetic energy of photoelectrons in the image intensifier is greatly increased by the ______.

    potential difference across the tube

  • 15

    Light produced at the output phosphor of the image intensifier has been increased _____ times in intensity.

    50 to 75

  • 16

    Electrons hit the _____ after exiting the anode.

    output phosphor

  • 17

    The ________ is the product of the minification gain and the flux gain.

    brightness gain

  • 18

    The ratio of x-rays incident on the input phosphor to light photons exiting the output phosphor is called the _______ gain.

    flux

  • 19

    The capability of an image intensifier to increase the illumination level of the image is called its ___________.

    brightness gain

  • 20

    An image intensifier tube is identified by the diameter of its ______.

    input phosphor

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    問題一覧

  • 1

    Fluoroscopy was developed so that radiologists could view _______ images.

    dynamic

  • 2

    What is the milliamperage used during fluoroscopy?

    £5mA

  • 3

    The image intensifier improved fluoroscopy by increasing image _________.

    brightness

  • 4

    Image intensified fluoroscopy is performed at illumination levels similar to ________.

    radiograph viewing

  • 5

    Visual acuity in the eye is greatest at the ________ , where _______ are concentrated.

    fovea centralis; cones

  • 6

    The ability of the eye to detect differences in brightness levels is termed _______.

    contrast perception

  • 7

    The ______ in the retina are stimulated by ______ light; the ________ are stimulated by _____ light.

    rods; low; cones; bright

  • 8

    With image intensification the light level is raised to _____ vision.

    photopic

  • 9

    X-rays that exit the patient and enter the image intensifier first interact with the _______.

    input phosphor

  • 10

    The output phosphor of the image intensifier is composed of ______.

    zinc cadmium sulfide

  • 11

    The input phosphor converts ______ to _______.

    x-rays; light

  • 12

    The in the image intensifier emits electrons when it is stimulated by light photons.

    photocathode

  • 13

    The number of light photons emitted within the image intensifier is ______ to the amount of x-ray photons exiting the patient.

    directly proportional

  • 14

    The kinetic energy of photoelectrons in the image intensifier is greatly increased by the ______.

    potential difference across the tube

  • 15

    Light produced at the output phosphor of the image intensifier has been increased _____ times in intensity.

    50 to 75

  • 16

    Electrons hit the _____ after exiting the anode.

    output phosphor

  • 17

    The ________ is the product of the minification gain and the flux gain.

    brightness gain

  • 18

    The ratio of x-rays incident on the input phosphor to light photons exiting the output phosphor is called the _______ gain.

    flux

  • 19

    The capability of an image intensifier to increase the illumination level of the image is called its ___________.

    brightness gain

  • 20

    An image intensifier tube is identified by the diameter of its ______.

    input phosphor