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Chap 11 & 12 word1

QuestionAnswer
Air gap a space between the patient and the film; used to reduce scatter (a large OID)
Back scatter scatter that is directed back toward the x-ray tube
Coherent scatter (Thompson scatter) interaction takes place at relatively low energy levels (below 10 keV). When the incoming photon is absorbed by the atom, the becomes excited, the excited atom produces a new x-ray photon but in a new direction and has the same energy and wavelength.
Compton effect Incoming x-ray photon interacts with an outer shell electron of an atom ejecting it from the atom and then proceeds in a different direction. The majority of the photon’s energy is converted into a new photon and has less energy and longer wavelength
Crosshatch grid a composite of two grid s with the lead strips at right angle to each other
Focal range the range of distance with in which the grid will not absorb an undue amount of useful radiation
Focused grid lead strips are aligned to the direction of the diverging primary x-ray beam, is precisely aligned to the to the x-ray beam at specific SID
Grid a device placed between the patient and the IR to reduce radiation fog; consists of closely placed lead strips aligned side by side
Variable kVp chart technique chart in which the mAs is constant and kVp changes per patient size
Grid cutoff excessive absorption of useful radiation by the grid and appears as decreased radiographic density on one side of the image
Grid frequency the number of lead strips per inch
Grid ratio the effectiveness of a grid, the relationship between the height of the lead strip to the width of the inner space material
Parallel grid a grid in which the lead strips are parallel; to each other and can be used for very long SID
Photoelectric effect the x-ray photon is totally absorbed in the body tissue; the incoming energy is an x-ray photon interacting with an atom in the body rather than an electron interacting with tungsten anode
Characteristic photon x-ray photon that is produced by the photoelectric effect
Secondary radiation radiation produced by the photoelectric effect
Stationary grid a high frequency grid that does not move
Technique chart a listing of various radiographic techniques for procedures done with all the exposure factors for each body part according to thickness. Includes type of exam projection, screen type, SID and part
Compensating filter specially designed filter that is used for areas of uneven densities to attenuate x-ray beam to improve detail
Fixed kVp chart a technique chart where the kVp remains the same (optimum range) and the mAs varies
Coned-down image a radiograph of a very small area of subject; a specific area of interest is centered to the field
Grid cassette a special cassette with a grid built into the front side; typically have lower ratios than the grid
Grid lines image of the grid itself, the strips used in a grid that absorbs radiation is seen on the radiograph
Grid radius the SID in which the primary beam is precisely aligned to the x-ray beam
Scatter radiation radiation hits an object (atom) and changes direction
Caliper tool used for body part measurement usually in cm
Optimum kVp the highest kVp setting that is sufficient to adequately penetrate the part regardless if size and will produce sufficient contrast for acceptable image quality
Radiographic phantom a human skeleton or portion of a skeleton, encased in a plastic material that is similar in density to human tissue
Bucky grid inside the table for taking x-rays
Potter-bucky the moving grid inside of the x-ray table that prevents grid lines/ is interchanged with the bucky.
Created by: mdtodd
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