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Chapter 40 & 41

Principles of Radiographic Imaging (Carlton)

QuestionAnswer
T or F Brightness gain increases with use False
Full intercept position the only time when an exposure can be made in fluoroscopy
T or F There is a direct relationship between distance from the fulcrum and blur True
Quantum Mottle grainy appearance caused by too little radiation
T or F Video monitors emit low energy x-rays True
Automatic brightness control response time slow
T or F Fluoro tubes routinely use high mA stations Fasle - longer periods of time with low mA
Complex tomo movements require this Counter-rotation of the grid
Minimum SSD for stationary fluoro 15 inches
T or F The more blurring the more density False - decreased density
In linear tomo, structures parallel to the motion do this streak
Main use of tomo's localize objects without superimposition
Section thickness decreases with this increased tomo amplitude
These commonly occur during circular tomo phantoms
In a fixed fluoroscopy unit SOD cannot be less than this 15 inches
Flux gain measurement of the increase in photons caused by conversion efficiency of the output screen
Minimum for SSD for moblie fluoro 12 inches
The relationship of tomo amplitude and section thickness Inverse
The mounting for a fluoro tube and image receptor C-arm
During intensification, the beam exits the patient and hits this... input screen of the intensifier
Monitors the current between the cathode and anode of the intensifier to maintain density and contrast Automatic brightness control systems
It is a dynamic and diagnostic study fluoroscopy
Relationship of the image receptor to blur width direct relationship
This supports the intensifier, the power drive controls, and the spot film selector Carriage
Modality used for heart studies, surgical procedures, intestinal studies, and GI tract studies Fluoroscopy
Adjustments in techniques are made this way because time settings are fixed and cause limitations by varying kVp
The distortion from the input screen is controlled by this shape of the screen
The shape of the input screen concave
Struck by the primary beam after exiting the patient in fluoroscopy input screen
Edge distortion in image intensification tubes vignetting
most common fluoro viewing system real-time video
The input screen emits this light photons
The input screen absorbs this x-ray photons
Composed of photoemissive metals photocathode
Photoemissive materials emit this Electrons
Standard spot film cassette 9x9 cassette
Absorbed by the photocathode light photons
The photocathode emits electrons
These are actually charged electrodes electrostatic lenses
Common solution for quantum mottle Increase mA
Standard number of digital fluoro pixels 200-300 micrometers
The output screen absorbs this electrons
The output screen emits this light photons
A measure of the increase in image intensity, determined by the minification gain, and determined by the flux gain total brightness gain
Where to put body part being imaged by tomography at the fulcrum
They are focused and accelerated by the electrostatic lenses electrons
The primary brightness gain occurs because of this... the acceleration and focusing of the electron beam
The greater the voltage supplied to the electrostatic lenses the greater this... acceleration and the closer the focal point
Varies fluoroscopic resolution minification gain, electrostatic focal point, and input & output screen diameter
T or F Body part imafed at the fulcrum is sharp in details True
T or F The greater the distance from the fulcrum, the greater the blurring True
Created by: erican428