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RAD170 Chapter 40

Fluoro

QuestionAnswer
Where is the fluoro tube? The image intensifier? tube under table, image intensifier above
What are the components of the image intensifier? input phosphor, photocathode, electrostatic focusing lenses, anode, output phosphor
What is the input phosphor made of? cesium iodide crystals
What does the input phosphor do? converts 1 x-ray photon to 300 light photons
What is the photocathode made of? What is the charge? cesium & antimony; negative
What does the photocathode do? converts 1 light photon to 1000 photoelectrons
What are the charge & voltage of the electrostatic focusing lenses? negative, 25-35 kVP
What do the electrostatic focusing lenses do? focus photoelectrons and accelerate them towards the anode
What happens at the focal point? the image is reversed
What does the anode do? How? attracts photoelectrons because of positive charge
What is the output phosphor made of? zinc cadmium sulfide
What does the output phosphor do? converts 1 photoelectron to 3000 light photons
What is flux gain? How is it calculated? increased brightness from photoelectron acceleration # of output photons/# of input photons
What is minification gain? How is it calculated? increased brightness from conentrating photons (input phosphor diameter)^2/(output phosphor diameter)^2
How do you calculate total brightness gain? flux gain x minification gain
What is ABC? Automatic Brightness Control - maintains image brightness by adjusting technique automatically
What are the 2 types of video camera tubes? What is their purpose? vidicon & Plumbicon; convert light photons to electric signal for display on monitor
What is a CCD? charge-coupled device - semiconductor that stores the charge from light photons
Created by: SCash21