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51 Cards in this Set
- Front
- Back
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Know the major components of an image intensifier
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Input Phosphor, Photocathode, Glass Envelope, Electrons, Electostatic Lenses, Anode, Output Phosphor, Focal Point (See Slide 9 in handout)
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The reduction in size of the output phosphor image as compared to the input phosphor image which increases light intensities is...
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Minification Gain
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_______ ______ is the product of both flux gain and minification gain and results in a brighter image on the output phosphor.
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Brightness Gain
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Minification Gain = (formula)
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diameter of input phosphor/diameter of output phosphor squared
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Conversion Factor = (formula)
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output phosphor illumination/input exposure rate. This factor expresses intensification.
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Accelerated electrons that increases light intensities at the output phosphor. The ratio of the number of light photons at the output phosphor to x-rays at the input phosphor is...
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Flux Gain
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Flux Gain = (formula)
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number of output light photons/number of input x-ray photons
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Brightness Gain = (formula)
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Minification Gain x Flux Gain
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The part of the image intensifier that electrons interact with and produce light
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Output Phosphur
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_______ is the process in which the exit radiation from the patient interacts with a light emitting material converting to light
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Image Intensification
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What is the technique for bady part measurement?
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Body cenimeters x 1.3
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Flouroscopy units must have a shield to cover this slot
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Buckey slot cover
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What is the primary source of radiation when the patient is lying on the table?
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The patient
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A lead apron of how many millimeters should be worn by all persons in flouro at all times?
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.5mm
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US federal law requires an audible timer to sound after how many minutes? (flouro)
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5 minutes
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Table top exposure should not exceed how many rads per minutes?
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10
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A camera that operates by recording a series of static images at high speed
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cine camera
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Images created when the ______ sprays 'something' stream of electrons from the camera to the screen
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Electron gun
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A ______ is a cathode ray tube that consists of a vacum tube with a flourescent phospher coated on the inside of the front screen in an electron gun
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video monitor
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______ is a blotchy, grainy appearance caused by insufficient radiation to create a uniform image
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quantum mottle
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The most common way to remedy quantum mottle is to what?
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increase the mA
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Flouroscopy uses a high or low kV
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high
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_______ are used to focus the electrons in the image intensifier
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electrostatic lenses
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The flouroscent screen absorbs the x-ray photons and emits ______.
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light photons
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When did Edison invent the flouroscope?
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1896 (Shannon didn't talk loud enough on this one and I am too lazy to go get my book, so I hope this is right)
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Spot films are A) not necessary but a good idea B)should be performed by a radiologist C)preserve the image under flouro D)hard to do
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C) Preserve the image under flouro
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What does contrast do?
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Enhances the anatomy
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How would you define a dynamic study?
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Shows real time and motion of internal organs
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A good grid to use in portable radiography is 5:1 or 18:1
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5:1 because you can be off of technique and centering and still be okay
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When doing several portable radiographs in one trip, how do you identify between the cassettes?
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Labels
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What are some things to carry around on a mobile unit?
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An extra cassette, adhesive tape, generic markers
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What is the minimum distance a person should be from a portable unit to avoid exposure?
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6 ft.
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When performing a "something" exam: A
B C D |
D) both A & B
(Sorry, I couldn't understand a whole lot of this question) |
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When performing a portable exam A)rearrange room furniture after the exam B) ask the family to leave C) speak to an incognitive patient as though they hear you D)all of the above
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D) all of the above
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Most of the time a portable is requested because why?
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Because of the patient's condition
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What procedure may require the use of Herrington rods?
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A scoliosis corrective procedure
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How do you define closed reduction?
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Non-invasive
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What does the abbreviation ORIF mean?
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Open reduction internal fixation
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A primary pathologic indication for an operative calangiogram is what?
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gall stones/ calculi
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What happens when you hit the boost button on a C-arm?
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brightens the image
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Which of the following methods will help reduce patient dose during a flouro procedure during surgery?
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intermitten flouro
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True or False. Shoe covers are not required in the pre-surgical or recovery areas.
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False
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True or False. Only sterile items are allowed in the sterile field.
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True
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True or False. The entire sterile gown worn by the surgeon is considered sterile.
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False
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True or False. The OR table is considered sterile only at the level of the table top.
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True
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Which of the following items is best during a hip pinning procedure to protect the sterile field?
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Shower curtain
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What should a tech do if the sterile field is violated during surgerical procedure?
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Notify the surgery team
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Which of the following is not an essential attribute for the surgical radiographer?
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Master of nursing skills
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True or False. Grids are recommended for mobile chest exams.
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False
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What are the three cardinal rules of radiation proctection?
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Distance, shielding, time.
Distance is the most effective. |
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True or False. C-arm digital flouro system uses two monitors.
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True.
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