Physics Chapter 25

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通報

問題一覧

Fluoroscopy was developed so that radiologists could view _______ images.

dynamic

What is the milliamperage used during fluoroscopy?

£5mA

The image intensifier improved fluoroscopy by increasing image _________.

brightness

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

radiograph viewing

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

fovea centralis; cones

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

contrast perception

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

rods; low; cones; bright

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

photopic

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

input phosphor

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

zinc cadmium sulfide

The input phosphor converts ______ to _______.

x-rays; light

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

photocathode

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

directly proportional

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

potential difference across the tube

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

50 to 75

Electrons hit the _____ after exiting the anode.

output phosphor

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

brightness gain

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

flux

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

brightness gain

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

input phosphor

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問題一覧

Fluoroscopy was developed so that radiologists could view _______ images.

dynamic

What is the milliamperage used during fluoroscopy?

£5mA

The image intensifier improved fluoroscopy by increasing image _________.

brightness

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

radiograph viewing

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

fovea centralis; cones

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

contrast perception

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

rods; low; cones; bright

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

photopic

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

input phosphor

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

zinc cadmium sulfide

The input phosphor converts ______ to _______.

x-rays; light

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

photocathode

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

directly proportional

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

potential difference across the tube

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

50 to 75

Electrons hit the _____ after exiting the anode.

output phosphor

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

brightness gain

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

flux

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

brightness gain

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

input phosphor