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Radiation chp6

QuestionAnswer
Most Common Cassette Sizes 14x17, 10x12, 8x10
Anode postive side of the x-ray tube
Cathode negative side of the x-ray tuibe contains the filament and focusing cup
Collimator controls the size and shape of the x-ray field coming out of the x-ray tube
What is Generator a coil of wire rotating through a magnetic field produces an electric current
Kilvotage Peak a measure of electrical presssure forcing the current through the tube also affects the energy QUALIlty of the x-ray photons produced
When the kVp is decreased the quality of the beam and the quality of the radiograph change Decreasing will: give a shorter scale of contrast, longer wavelength, decrease in intensity
Latitude range of x-ray exposure over which a radiograph is acceptable
Wide latitude long gray scale or low contrast
Narrow latitude short gray scale or high contrast
Film latitude is influenced primarily by inherent characterisctics of the film
1 millampere equals 1/1000 of an ampere
The overall blackness of the film Density
ma controls the QUANITITY of the x-ray beam
If the image lacks density then its underexposed
mAs must be increased by 30% to see a noticeable change
Density of a radiograph is determined by the amount of silver developed
The best way to reduce unwanted density caused by scatter radiation is collimattig (restricting the beam)
If SID is to low equals overexposed film detail will also change
Density greatly effects quality
The light emitted from a screen contributes to 95% of the overall film density
Automatic exposure controls are useful for: density must remain constant, Faulty density causes repeats, and density greatly affects quality
The source to image distance standard is 40 inches from the film to the radiographic tube
An icrease in SID without any compensation in exposure factors equals a visible radiographic image of HIGH CONTRAST
WHat is detail the degree to which the smallest structural lines of the anatomy can be recorded on film 1. based on sharpness of the image boundary 2. and the visiblilty of detail
A small focal spot will give you Better detail
A Quantum Mottle is the Result of an insufficent number of x-rays
As radiation exits the tube primary radiation is emitted from the tube
As radiation exits the tube absorbed radiation enters the patient adn is absorbed
As radiation exits the tube Remnant Radiation passes through the patient and the cassette
As Radiation exits the tube secondary scatter Bounces off the patient
Created by: leslier