The Eye
The ability of the eye to detect differences in brightness levels is termed
What is contrast perception?
Part of II which emits electrons when it is stimulated by light photons.
What is photocathode?
Fluoro kVp for BE.
What is 110-120?
Reason fluoroscopy was developed
What is so the radiologist could view dynamic images?
The time it takes to turn on the digital fluoroscopy x-ray tube and reach the selected kVp and mA.
What is interrogation time?
Greatest visual acuity of the eye?
What is fovea centralis where cones are concentrated
Part of II which converts ___________ to ___________.
What is xrays to light?
Fluoro for an air contrast BE.
What is 80-90?
With image intensification the light level is raised to ___________ vision?
What is photopic?
Digital fluoroscopy uses at least __________ monitors.
What is two?
The __________ in the retina are stimulated by low light.
What are rods?
Output phosphor is made of this
What is zinc cadium sulfide?
mA used during fluoro
What is less than or equal to 5 mA?
Relationship of x-ray photons exiting the patient and the number of light photons emitted within the image intensifier.
What is directly proportional?
Principal advantage of digital fluoroscopy?
What is image substraction?
The ___________ in the retina are stimulated by bright light.
What is cones?
Product of MG and FG?
What is brightness gain?
Of an input screen 25/17, the 17 will produce __________ radiation dose and ________ magnification of body area
What is more patient radiation dose and more magnification of body area?
The image intensifier improved fluoroscopy by increasing image ____________.
What is brightness?
In mask mode, the ____________ image is shown on monitor A and the ___________ image is shown on monitor B.
What is monitor A = subtracted image and monitor B = mask image?
The area where the optic nerve enters the eye.
What is the blind spot?
Light produced at the output phosphor has been increased ___________ times in intensity.
What is 50-75?
The size of which phosphor is used to identify the II tube.
What is the input phosphor?
Image intensified fluoroscopy is performed at illumination levels similar to ___________ viewing.
What is radiograph viewing?
Image integration results in ____________ patient dose.
What is increased?