Fluoroscopy Image Intensifier
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| What year was the Image Intensifier developed? | show 🗑
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| Why is there a loss of detail with video system fluoroscopy in comparison optical mirror viewing systems? | show 🗑
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| show | 500-8000x. Photopic vision becomes active at about 1000x.
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| show | The Carriage
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| What is typically included on the carriage? | show 🗑
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| show | Regulates the x-ray tube mA?
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| What do federal regulations prohibit in regards to fluroscopy x-ray tube and primary beam? What is done to avoid this from happening? | show 🗑
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| show | To vary beam geometry for maximum resolution. TO reduce exposure to the operator from scatter by the patient.
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| show | The fluoro x-ray tube target must be fixed to prevent an SOD of less than 15".
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| show | Vacuum Bottle/Glass Enevelope, Input Layer, Electronic Lenses & Output Phosphor.
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| show | Primary x-ray beam strikes the input phosphor after exiting the patient?
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| What fluorescent material is the Input phosphor made of? | show 🗑
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| What happens at the input phosphor? How much of the incident beam is absorbed by the CsI? | show 🗑
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| What process happens at the photocathode? What is being converted? What are the steps in this process? | show 🗑
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| show | Towards the anode end of the Image Intensification tube?
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| What happens at Electronic Lenses of the Image Intensification tube? How does the lens accelerate the electrons? | show 🗑
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| show | 25,000 V or 25 kV.
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| show | Yes
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| Where does the primary brightness gain occur from? Why is this? | show 🗑
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| What is the Anode? Where is the Anode of the Intensification Tube positioned? | show 🗑
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| What is Anode usually charged? What voltage is it usually supplied from and from where? | show 🗑
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| show | Zinc Cadmium Sulfide
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| show | The output screen absorbs the electrons from the photocathode that went through the electronic lenses through the hole in the Anode. The output screen converts the electrons into light photons.
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| show | 3000 light photons. 1000x brighter.
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| How many light photons are converted from 1 x-ray photon at the Input phosphor? | show 🗑
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| What is the size of the output phosphor? | show 🗑
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| What are the typical input screen sizes? | show 🗑
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| show | The same # of electrons that were produced at the input phosphor being compressed into the area of the output screen? MG=Distance 1 squared/Distance 2 squared.
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| show | A measurement in the increase of light photons due to conversion efficiency of the output screen. In simple terms "How many light photons are produced at the output phosphor for each electron that strikes it?"
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| show | 50-150 depending on manufacturer specifications.
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| What is Total Brightness Gain? What is the formula? | show 🗑
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| show | As much as 10% per year. Input & Output phosphors age.
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| What is the Conversion Factor? What is the formula? | show 🗑
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| How does the magnification work on the multifield image intensifier tubes? | show 🗑
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| What is the Magnification Factor? | show 🗑
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Created by:
jamestkelley
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