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VTI: Radiography Chapter 4: Exposure Factors
Chapter 4: Exposure Factors
24
Veterinary Medicine
Undergraduate 3
03/17/2011

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Term
Energy related to motion
Definition
Kinetic energy
Term
Release of electrons from orbits by heat
Definition
Thermionic emission
Term
Device used to measure anatomic parts
Definition
Caliper
Term
One thousandth of an ampere, # of x-rays
Definition
Milliampere
Term
Distance between source of x-rays and image receptor
Definition

Source Image Distance

(SID)

Term
The difference between two adjacent densities
Definition
Contrast
Term
Method of estimating kilovoltage in relation to thickness
Definition
Sante's Rule
Term
Responsible for acceleration, and electrical difference between cathode and anode
Definition
Kilovoltage
Term
Variation in intensity of radiation as the distance from the source changes
Definition
Inverse Square Law
Term
Period of time x-rays leave the x-ray tube
Definition
Exposure Time
Term
Degree of blackness on film
Definition
Density
Term
Multiplying milliamperage by the tim
Definition
mAs
Term
Determined by the penetrating power (kilovoltage)
Definition

Quality

 

Remember: The shorter the wavelength the more penetrating power and the ability it has

Term
Number of x-rays traveling from the tube toward film (mA)
Definition

Quantity

 

Remember: Intensity of the x-ray beam is the # of x-rays traveling from the tube towards the film in a period of time

Term
In order for an x-ray tube to produce x-rays this must occur
Definition
Electrical current must be supplied to bothe filament and the field between the cathode anode
Term

Measured in thousand of volts responsible for accelerating the electrons from the cathode to the anode relates to penetrating power

 

Definition
Kilovoltage
Term
Determines the quality of x-rays the higher kVp means more penetrating beams (more x-rays reach the film)
Definition
Kilovoltage peak
Term
Formula for Sante's Rule:
Definition
(2x thickness) + 40=kVp
Term
As mA is increased the # of electrons is decreased or increased
Definition
Increased
Term
What are the advantages of high mA settings
Definition
  • Allows or shortter time settings
  • possibility of motion decreased
  • Allows examination of thivker area on patient
  • Decrease in time-less exposure to personnel
Term
What is the most common artifacts in veterinary medicine
Definition
Motion
Term
As SID decrease the intensity of x-rays will
Definition

Increase

 

Remember: SID Increases the intensiy of xrays decrease

Term
FFD stands for
Definition
Film focal distance
Term
When the Sid decreases the image sharpness_____
Definition
Decreases
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